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2013-09-09perf trace: Handle perf.data files with no tracepointsArnaldo Carvalho de Melo
Before: perf trace -i perf.data Segmentation fault (core dumped) # After: # perf trace -i perf.data Data file does not have raw_syscalls:sys_enter events # When there are no tracepoints in a perf.data file the struct pevent that contains the list of tracepoints that will be used to lookup the tracepoint id by name will not be populated, causing a NULL deref. And we don't need to do all that dance to look at pevents for an entry with a slighly different name to then lookup the tracepoint by its id on the evlist, just use the perf_evlist__find_tracepoint_by_name() routine, that will find the tracepoint, if present. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-egcm21k1e6gcyxpcgjxtmsq3@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-09-09Merge tag 'xfs-for-linus-v3.12-rc1' of git://oss.sgi.com/xfs/xfsLinus Torvalds
Pull xfs updates from Ben Myers: "For 3.12-rc1 there are a number of bugfixes in addition to work to ease usage of shared code between libxfs and the kernel, the rest of the work to enable project and group quotas to be used simultaneously, performance optimisations in the log and the CIL, directory entry file type support, fixes for log space reservations, some spelling/grammar cleanups, and the addition of user namespace support. - introduce readahead to log recovery - add directory entry file type support - fix a number of spelling errors in comments - introduce new Q_XGETQSTATV quotactl for project quotas - add USER_NS support - log space reservation rework - CIL optimisations - kernel/userspace libxfs rework" * tag 'xfs-for-linus-v3.12-rc1' of git://oss.sgi.com/xfs/xfs: (112 commits) xfs: XFS_MOUNT_QUOTA_ALL needed by userspace xfs: dtype changed xfs_dir2_sfe_put_ino to xfs_dir3_sfe_put_ino Fix wrong flag ASSERT in xfs_attr_shortform_getvalue xfs: finish removing IOP_* macros. xfs: inode log reservations are too small xfs: check correct status variable for xfs_inobt_get_rec() call xfs: inode buffers may not be valid during recovery readahead xfs: check LSN ordering for v5 superblocks during recovery xfs: btree block LSN escaping to disk uninitialised XFS: Assertion failed: first <= last && last < BBTOB(bp->b_length), file: fs/xfs/xfs_trans_buf.c, line: 568 xfs: fix bad dquot buffer size in log recovery readahead xfs: don't account buffer cancellation during log recovery readahead xfs: check for underflow in xfs_iformat_fork() xfs: xfs_dir3_sfe_put_ino can be static xfs: introduce object readahead to log recovery xfs: Simplify xfs_ail_min() with list_first_entry_or_null() xfs: Register hotcpu notifier after initialization xfs: add xfs sb v4 support for dirent filetype field xfs: Add write support for dirent filetype field xfs: Add read-only support for dirent filetype field ...
2013-09-09direct-io: Use return from cmpxchg to decide of assignment happenedOlof Johansson
Not using the return value can in the generic case be racy, so it's in general good practice to check the return value instead. This also resolved the warning caused on ARM and other architectures: fs/direct-io.c: In function 'sb_init_dio_done_wq': fs/direct-io.c:557:2: warning: value computed is not used [-Wunused-value] Signed-off-by: Olof Johansson <olof@lixom.net> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: H Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-09dcache: Translating dentry into pathname without taking rename_lockWaiman Long
When running the AIM7's short workload, Linus' lockref patch eliminated most of the spinlock contention. However, there were still some left: 8.46% reaim [kernel.kallsyms] [k] _raw_spin_lock |--42.21%-- d_path | proc_pid_readlink | SyS_readlinkat | SyS_readlink | system_call | __GI___readlink | |--40.97%-- sys_getcwd | system_call | __getcwd The big one here is the rename_lock (seqlock) contention in d_path() and the getcwd system call. This patch will eliminate the need to take the rename_lock while translating dentries into the full pathnames. The need to take the rename_lock is to make sure that no rename operation can be ongoing while the translation is in progress. However, only one thread can take the rename_lock thus blocking all the other threads that need it even though the translation process won't make any change to the dentries. This patch will replace the writer's write_seqlock/write_sequnlock sequence of the rename_lock of the callers of the prepend_path() and __dentry_path() functions with the reader's read_seqbegin/read_seqretry sequence within these 2 functions. As a result, the code will have to retry if one or more rename operations had been performed. In addition, RCU read lock will be taken during the translation process to make sure that no dentries will go away. To prevent live-lock from happening, the code will switch back to take the rename_lock if read_seqretry() fails for three times. To further reduce spinlock contention, this patch does not take the dentry's d_lock when copying the filename from the dentries. Instead, it treats the name pointer and length as unreliable and just copy the string byte-by-byte over until it hits a null byte or the end of string as specified by the length. This should avoid stepping into invalid memory address. The error cases are left to be handled by the sequence number check. The following code re-factoring are also made: 1. Move prepend('/') into prepend_name() to remove one conditional check. 2. Move the global root check in prepend_path() back to the top of the while loop. With this patch, the _raw_spin_lock will now account for only 1.2% of the total CPU cycles for the short workload. This patch also has the effect of reducing the effect of running perf on its profile since the perf command itself can be a heavy user of the d_path() function depending on the complexity of the workload. When taking the perf profile of the high-systime workload, the amount of spinlock contention contributed by running perf without this patch was about 16%. With this patch, the spinlock contention caused by the running of perf will go away and we will have a more accurate perf profile. Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-09Merge tag 'for-linus-20130909' of git://git.infradead.org/linux-mtdLinus Torvalds
Pull mtd updates from David Woodhouse: - factor out common code from MTD tests - nand-gpio cleanup and portability to non-ARM - m25p80 support for 4-byte addressing chips, other new chips - pxa3xx cleanup and support for new platforms - remove obsolete alauda, octagon-5066 drivers - erase/write support for bcm47xxsflash - improve detection of ECC requirements for NAND, controller setup - NFC acceleration support for atmel-nand, read/write via SRAM - etc * tag 'for-linus-20130909' of git://git.infradead.org/linux-mtd: (184 commits) mtd: chips: Add support for PMC SPI Flash chips in m25p80.c mtd: ofpart: use for_each_child_of_node() macro mtd: mtdswap: replace strict_strtoul() with kstrtoul() mtd cs553x_nand: use kzalloc() instead of memset mtd: atmel_nand: fix error return code in atmel_nand_probe() mtd: bcm47xxsflash: writing support mtd: bcm47xxsflash: implement erasing support mtd: bcm47xxsflash: convert to module_platform_driver instead of init/exit mtd: bcm47xxsflash: convert kzalloc to avoid invalid access mtd: remove alauda driver mtd: nand: mxc_nand: mark 'const' properly mtd: maps: cfi_flagadm: add missing __iomem annotation mtd: spear_smi: add missing __iomem annotation mtd: r852: Staticize local symbols mtd: nandsim: Staticize local symbols mtd: impa7: add missing __iomem annotation mtd: sm_ftl: Staticize local symbols mtd: m25p80: add support for mr25h10 mtd: m25p80: make CONFIG_M25PXX_USE_FAST_READ safe to enable mtd: m25p80: Pass flags through CAT25_INFO macro ...
2013-09-09Merge tag 'firewire-updates' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 Pull firewire updates from Stefan Richter: - Fix a regression since 3.2 inclusive: The subsystem workqueue deadlocked between transaction completion handling and bus reset handling if the worker pool could not be increased in time. - janitorial updates * tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire: ohci: Fix deadlock at bus reset firewire: ohci: Change module_pci_driver to module_init/module_exit firewire: ohci: beautify some macro definitions firewire: ohci: change confusing name of a struct member firewire: core: typecast from gfp_t to bool more safely firewire: WQ_NON_REENTRANT is meaningless and going away
2013-09-09MAINTAINERS: update email for Dan WilliamsDan Williams
Returned to intel.com Cc: Vinod Koul <vinod.koul@intel.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Jon Mason <jon.mason@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Neil Brown <neilb@suse.de> Cc: Shaohua Li <shli@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2013-09-09Merge branch 'for-v3.12' of ↵Linus Torvalds
git://git.linaro.org/people/mszyprowski/linux-dma-mapping Pull DMA mapping update from Marek Szyprowski: "This contains an addition of Device Tree support for reserved memory regions (Contiguous Memory Allocator is one of the drivers for it) and changes required by the KVM extensions for PowerPC architectue" * 'for-v3.12' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping: ARM: init: add support for reserved memory defined by device tree drivers: of: add initialization code for dma reserved memory drivers: of: add function to scan fdt nodes given by path drivers: dma-contiguous: clean source code and prepare for device tree
2013-09-09dma: mv_xor: Fix incorrect error pathSachin Kamat
Return directly if memory allocation fails. There is no need of dma_free_coherent(). Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Cc: Saeed Bishara <saeed@marvell.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2013-09-09Merge tag 'virtio-next-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull virtio update from Rusty Russell: "More console fixes; these are the theoretical ones which didn't get CC:stable. But for that reason, I did a merge with master partway through to avoid an unnecessary conflict. Also: a fun lguest bug turns out if you don't clear the TF flag when trapping Bad Things happen to the guest kernel as the stack overflows..." * tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: virtio_pci: pm: Use CONFIG_PM_SLEEP instead of CONFIG_PM lguest: fix GPF in guest when using gdb. lguest: fix guest kernel stack overflow when TF bit set. lguest: fix BUG_ON() in invalid guest page table. virtio: console: prevent use-after-free of port name in port unplug virtio: console: cleanup an error message virtio: console: fix locking around send_sigio_to_port() virtio: console: add locking in port unplug path virtio: console: add locks around buffer removal in port unplug path tools/lguest: offer VIRTIO_F_ANY_LAYOUT for net device. virtio tools: add .gitignore lguest: Point to the right directory for the lguest launcher
2013-09-09Merge tag 'vfio-v3.12-rc0' of git://github.com/awilliam/linux-vfioLinus Torvalds
Pull VFIO update from Alex Williamson: "VFIO updates include safer default file flags for VFIO device fds, an external user interface exported to allow other modules to hold references to VFIO groups, a fix to test for extended config space on PCIe and PCI-x, and new hot reset interfaces for PCI devices which allows the user to do PCI bus/slot resets when all of the devices affected by the reset are owned by the user. For this last feature, the PCI bus reset interface, I depend on changes already merged from Bjorn's PCI pull request. I therefore merged my tree up to commit cb3e433, which I think was the correct action, but as Stephen Rothwell noted, I failed to provide a commit message indicating why the merge was required. Sorry for that. Thanks, Alex" * tag 'vfio-v3.12-rc0' of git://github.com/awilliam/linux-vfio: vfio: fix documentation vfio-pci: PCI hot reset interface vfio-pci: Test for extended config space vfio-pci: Use fdget() rather than eventfd_fget() vfio: Add O_CLOEXEC flag to vfio device fd vfio: use get_unused_fd_flags(0) instead of get_unused_fd() vfio: add external user support
2013-09-09xen/spinlock: Don't use __initdate for xen_pv_spinKonrad Rzeszutek Wilk
As we get compile warnings about .init.data being used by non-init functions. Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2013-09-09aio: rcu_read_lock protection for new rcu_dereference callsArtem Savkov
Patch "aio: fix rcu sparse warnings introduced by ioctx table lookup patch" (77d30b14d24e557f89c41980011d72428514d729 in linux-next.git) introduced a couple of new rcu_dereference calls which are not protected by rcu_read_lock and result in following warnings during syscall fuzzing(trinity): [ 471.646379] =============================== [ 471.649727] [ INFO: suspicious RCU usage. ] [ 471.653919] 3.11.0-next-20130906+ #496 Not tainted [ 471.657792] ------------------------------- [ 471.661235] fs/aio.c:503 suspicious rcu_dereference_check() usage! [ 471.665968] [ 471.665968] other info that might help us debug this: [ 471.665968] [ 471.672141] [ 471.672141] rcu_scheduler_active = 1, debug_locks = 1 [ 471.677549] 1 lock held by trinity-child0/3774: [ 471.681675] #0: (&(&mm->ioctx_lock)->rlock){+.+...}, at: [<c119ba1a>] SyS_io_setup+0x63a/0xc70 [ 471.688721] [ 471.688721] stack backtrace: [ 471.692488] CPU: 1 PID: 3774 Comm: trinity-child0 Not tainted 3.11.0-next-20130906+ #496 [ 471.698437] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 471.703151] 00000000 00000000 c58bbf30 c18a814b de2234c0 c58bbf58 c10a4ec6 c1b0d824 [ 471.709544] c1b0f60e 00000001 00000001 c1af61b0 00000000 cb670ac0 c3aca000 c58bbfac [ 471.716251] c119bc7c 00000002 00000001 00000000 c119b8dd 00000000 c10cf684 c58bbfb4 [ 471.722902] Call Trace: [ 471.724859] [<c18a814b>] dump_stack+0x4b/0x66 [ 471.728772] [<c10a4ec6>] lockdep_rcu_suspicious+0xc6/0x100 [ 471.733716] [<c119bc7c>] SyS_io_setup+0x89c/0xc70 [ 471.737806] [<c119b8dd>] ? SyS_io_setup+0x4fd/0xc70 [ 471.741689] [<c10cf684>] ? __audit_syscall_entry+0x94/0xe0 [ 471.746080] [<c18b1fcc>] syscall_call+0x7/0xb [ 471.749723] [<c1080000>] ? task_fork_fair+0x240/0x260 Signed-off-by: Artem Savkov <artem.savkov@gmail.com> Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
2013-09-09Merge tag 'nfs-for-3.12-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds
Pull NFS client updates from Trond Myklebust: "Highlights include: - Fix NFSv4 recovery so that it doesn't recover lost locks in cases such as lease loss due to a network partition, where doing so may result in data corruption. Add a kernel parameter to control choice of legacy behaviour or not. - Performance improvements when 2 processes are writing to the same file. - Flush data to disk when an RPCSEC_GSS session timeout is imminent. - Implement NFSv4.1 SP4_MACH_CRED state protection to prevent other NFS clients from being able to manipulate our lease and file locking state. - Allow sharing of RPCSEC_GSS caches between different rpc clients. - Fix the broken NFSv4 security auto-negotiation between client and server. - Fix rmdir() to wait for outstanding sillyrename unlinks to complete - Add a tracepoint framework for debugging NFSv4 state recovery issues. - Add tracing to the generic NFS layer. - Add tracing for the SUNRPC socket connection state. - Clean up the rpc_pipefs mount/umount event management. - Merge more patches from Chuck in preparation for NFSv4 migration support" * tag 'nfs-for-3.12-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (107 commits) NFSv4: use mach cred for SECINFO_NO_NAME w/ integrity NFS: nfs_compare_super shouldn't check the auth flavour unless 'sec=' was set NFSv4: Allow security autonegotiation for submounts NFSv4: Disallow security negotiation for lookups when 'sec=' is specified NFSv4: Fix security auto-negotiation NFS: Clean up nfs_parse_security_flavors() NFS: Clean up the auth flavour array mess NFSv4.1 Use MDS auth flavor for data server connection NFS: Don't check lock owner compatability unless file is locked (part 2) NFS: Don't check lock owner compatibility in writes unless file is locked nfs4: Map NFS4ERR_WRONG_CRED to EPERM nfs4.1: Add SP4_MACH_CRED write and commit support nfs4.1: Add SP4_MACH_CRED stateid support nfs4.1: Add SP4_MACH_CRED secinfo support nfs4.1: Add SP4_MACH_CRED cleanup support nfs4.1: Add state protection handler nfs4.1: Minimal SP4_MACH_CRED implementation SUNRPC: Replace pointer values with task->tk_pid and rpc_clnt->cl_clid SUNRPC: Add an identifier for struct rpc_clnt SUNRPC: Ensure rpc_task->tk_pid is available for tracepoints ...
2013-09-09Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse Pull fuse bugfixes from Miklos Szeredi: "Just a bunch of bugfixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: use list_for_each_entry() for list traversing fuse: readdir: check for slash in names fuse: hotfix truncate_pagecache() issue fuse: invalidate inode attributes on xattr modification fuse: postpone end_page_writeback() in fuse_writepage_locked()
2013-09-09Merge tag 'gfs2-merge-window' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-nmw Pull GFS2 updates from Steven Whitehouse: "This is possibly the smallest ever set of GFS2 patches for a merge window. Also, most of them are bug fixes this time. Two of my three patches (moving gfs2_sync_meta and merging the two writepage implementations) are clean ups with the third (taking the glock ref in examine_bucket) being a fix for a difficult to hit race condition. The removal of an unused memory barrier is a clean up from Bob Peterson, and the "spectator" relates to a rarely used mount option. Ben Marzinski's patch fixes a corner case where the incorrect inode flags were being set, resulting in incorrect behaviour on fsync" * tag 'gfs2-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-nmw: GFS2: dirty inode correctly in gfs2_write_end GFS2: Don't flag consistency error if first mounter is a spectator GFS2: Remove unnecessary memory barrier GFS2: Merge ordered and writeback writepage GFS2: Take glock reference in examine_bucket() GFS2: Move gfs2_sync_meta to lops.c
2013-09-09Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client Pull ceph updates from Sage Weil: "This includes both the first pile of Ceph patches (which I sent to torvalds@vger, sigh) and a few new patches that add support for fscache for Ceph. That includes a few fscache core fixes that David Howells asked go through the Ceph tree. (Thanks go to Milosz Tanski for putting this feature together) This first batch of patches (included here) had (has) several important RBD bug fixes, hole punch support, several different cleanups in the page cache interactions, improvements in the truncate code (new truncate mutex to avoid shenanigans with i_mutex), and a series of fixes in the synchronous striping read/write code. On top of that is a random collection of small fixes all across the tree (error code checks and error path cleanup, obsolete wq flags, etc)" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (43 commits) ceph: use d_invalidate() to invalidate aliases ceph: remove ceph_lookup_inode() ceph: trivial buildbot warnings fix ceph: Do not do invalidate if the filesystem is mounted nofsc ceph: page still marked private_2 ceph: ceph_readpage_to_fscache didn't check if marked ceph: clean PgPrivate2 on returning from readpages ceph: use fscache as a local presisent cache fscache: Netfs function for cleanup post readpages FS-Cache: Fix heading in documentation CacheFiles: Implement interface to check cache consistency FS-Cache: Add interface to check consistency of a cached object rbd: fix null dereference in dout rbd: fix buffer size for writes to images with snapshots libceph: use pg_num_mask instead of pgp_num_mask for pg.seed calc rbd: fix I/O error propagation for reads ceph: use vfs __set_page_dirty_nobuffers interface instead of doing it inside filesystem ceph: allow sync_read/write return partial successed size of read/write. ceph: fix bugs about handling short-read for sync read mode. ceph: remove useless variable revoked_rdcache ...
2013-09-09Merge tag 'metag-for-v3.12' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag Pull metag architecture changes from James Hogan: - Device tree updates for TZ1090 GPIO drivers merged via GPIO tree. - Add driver for ImgTec PDC irqchip as found in TZ1090 SoC. - Add linux-metag mailing list to MAINTAINERS file. * tag 'metag-for-v3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag: irq-imgpdc: add ImgTec PDC irqchip driver MAINTAINERS: add linux-metag mailing list metag: tz1090: instantiate gpio-tz1090-pdc metag: tz1090: select and instantiate gpio-tz1090 metag: tz1090: select and instantiate irq-imgpdc
2013-09-09Revert "xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM"Konrad Rzeszutek Wilk
This reverts commit 70dd4998cb85f0ecd6ac892cc7232abefa432efb. Now that the bugs have been resolved we can re-enable the PV ticketlock implementation under PVHVM Xen guests. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2013-09-09xen/spinlock: Don't setup xen spinlock IPI kicker if disabled.Konrad Rzeszutek Wilk
There is no need to setup this kicker IPI if we are never going to use the paravirtualized ticketlock mechanism. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2013-09-09xen/smp: Update pv_lock_ops functions before alternative code starts under PVHVMKonrad Rzeszutek Wilk
Before this patch we would patch all of the pv_lock_ops sites using alternative assembler. Then later in the bootup cycle change the unlock_kick and lock_spinning to the Xen specific - without re patching. That meant that for the core of the kernel we would be running with the baremetal version of unlock_kick and lock_spinning while for modules we would have the proper Xen specific slowpaths. As most of the module uses some API from the core kernel that ended up with slowpath lockers waiting forever to be kicked (b/c they would be using the Xen specific slowpath logic). And the kick never came b/c the unlock path that was taken was the baremetal one. On PV we do not have the problem as we initialise before the alternative code kicks in. The fix is to make the updating of the pv_lock_ops function be done before the alternative code starts patching. Note that this patch fixes issues discovered by commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23. ("xen: disable PV spinlocks on HVM") wherein it mentioned PV spinlocks cannot possibly work with the current code because they are enabled after pvops patching has already been done, and because PV spinlocks use a different data structure than native spinlocks so we cannot switch between them dynamically. The first problem is solved by this patch. The second problem has been solved by commit 816434ec4a674fcdb3c2221a6dffdc8f34020550 (Merge branch 'x86-spinlocks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip) P.S. There is still the commit 70dd4998cb85f0ecd6ac892cc7232abefa432efb (xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM) to revert but that can be done later after all other bugs have been fixed. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2013-09-09xen/spinlock: We don't need the old structure anymoreKonrad Rzeszutek Wilk
As we are using the generic ticketlock structs and these old structures are not needed anymore. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2013-09-09xen/spinlock: Fix locking path engaging too soon under PVHVM.Konrad Rzeszutek Wilk
The xen_lock_spinning has a check for the kicker interrupts and if it is not initialized it will spin normally (not enter the slowpath). But for PVHVM case we would initialize the kicker interrupt before the CPU came online. This meant that if the booting CPU used a spinlock and went in the slowpath - it would enter the slowpath and block forever. The forever part because during bootup: the spinlock would be taken _before_ the CPU sets itself to be online (more on this further), and we enter to poll on the event channel forever. The bootup CPU (see commit fc78d343fa74514f6fd117b5ef4cd27e4ac30236 "xen/smp: initialize IPI vectors before marking CPU online" for details) and the CPU that started the bootup consult the cpu_online_mask to determine whether the booting CPU should get an IPI. The booting CPU has to set itself in this mask via: set_cpu_online(smp_processor_id(), true); However, if the spinlock is taken before this (and it is) and it polls on an event channel - it will never be woken up as the kernel will never send an IPI to an offline CPU. Note that the PVHVM logic in sending IPIs is using the HVM path which has numerous checks using the cpu_online_mask and cpu_active_mask. See above mention git commit for details. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com>
2013-09-09Merge tag 'v3.11-rc7' into stable/for-linus-3.12Konrad Rzeszutek Wilk
Linux 3.11-rc7 As we need the git commit 28817e9de4f039a1a8c1fe1df2fa2df524626b9e Author: Chuck Anderson <chuck.anderson@oracle.com> Date: Tue Aug 6 15:12:19 2013 -0700 xen/smp: initialize IPI vectors before marking CPU online * tag 'v3.11-rc7': (443 commits) Linux 3.11-rc7 ARC: [lib] strchr breakage in Big-endian configuration VFS: collect_mounts() should return an ERR_PTR bfs: iget_locked() doesn't return an ERR_PTR efs: iget_locked() doesn't return an ERR_PTR() proc: kill the extra proc_readfd_common()->dir_emit_dots() cope with potentially long ->d_dname() output for shmem/hugetlb usb: phy: fix build breakage USB: OHCI: add missing PCI PM callbacks to ohci-pci.c staging: comedi: bug-fix NULL pointer dereference on failed attach lib/lz4: correct the LZ4 license memcg: get rid of swapaccount leftovers nilfs2: fix issue with counting number of bio requests for BIO_EOPNOTSUPP error detection nilfs2: remove double bio_put() in nilfs_end_bio_write() for BIO_EOPNOTSUPP error drivers/platform/olpc/olpc-ec.c: initialise earlier ipv4: expose IPV4_DEVCONF ipv6: handle Redirect ICMP Message with no Redirected Header option be2net: fix disabling TX in be_close() Revert "ACPI / video: Always call acpi_video_init_brightness() on init" Revert "genetlink: fix family dump race" ... Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2013-09-09Merge tag 'arc-v3.12-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC changes from Vineet Gupta: - ARC MM changes: - preparation for MMUv4 (accomodate new PTE bits, new cmds) - Rework the ASID allocation algorithm to remove asid-mm reverse map - Boilerplate code consolidation in Exception Handlers - Disable FRAME_POINTER for ARC - Unaligned Access Emulation for Big-Endian from Noam - Bunch of fixes (udelay, missing accessors) from Mischa * tag 'arc-v3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: fix new Section mismatches in build (post __cpuinit cleanup) Kconfig.debug: Add FRAME_POINTER anti-dependency for ARC ARC: Fix __udelay calculation ARC: remove console_verbose() from setup_arch() ARC: Add read*_relaxed to asm/io.h ARC: Handle un-aligned user space access in BE. ARC: [ASID] Track ASID allocation cycles/generations ARC: [ASID] activate_mm() == switch_mm() ARC: [ASID] get_new_mmu_context() to conditionally allocate new ASID ARC: [ASID] Refactor the TLB paranoid debug code ARC: [ASID] Remove legacy/unused debug code ARC: No need to flush the TLB in early boot ARC: MMUv4 preps/3 - Abstract out TLB Insert/Delete ARC: MMUv4 preps/2 - Reshuffle PTE bits ARC: MMUv4 preps/1 - Fold PTE K/U access flags ARC: Code cosmetics (Nothing semantical) ARC: Entry Handler tweaks: Optimize away redundant IRQ_DISABLE_SAVE ARC: Exception Handlers Code consolidation ARC: Add some .gitignore entries
2013-09-09of/platform: add error reporting to of_amba_device_create()Bartlomiej Zolnierkiewicz
Add error reporting to of_amba_device_create() so the user knows when (and why) some device tree nodes fail to initialize. [ The issue was spotted on Universal C210 board (using revision 0 of ARM Exynos4210 SoC) on which initialization was silently failing for PL330 MDMA1 device tree node (it was using the wrong addres resulting in amba_device_add() returning -ENODEV). ] Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Grant Likely <grant.likely@linaro.org>
2013-09-09Merge branch 'for-next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu Pull m68knommu fixes from Greg Ungerer: "Just a small collection of cleanups and fixes this time, no big changes. The most interresting are to make the m68k and m68knommu consistently use CONFIG_IOMAP, clean out some unused board config options and flush the cache on signal stack creation" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu: m68k: remove 16 unused boards in Kconfig.machine m68k: define 'VM_DATA_DEFAULT_FLAGS' no matter whether has 'NOMMU' or not m68knommu: user generic iomap to support ioread*/iowrite* m68k/coldfire: flush cache when creating the signal stack frame m68knommu: Mark functions only called from setup_arch() __init
2013-09-09Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/umlLinus Torvalds
Pull UML updates from Richard Weinberger: "This pile contains mostly fixes and improvements for issues identified by Richard W M Jones while adding UML as backend to libguestfs" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Add irq chip um/mask handlers um: prctl: Do not include linux/ptrace.h um: Run UML in it's own session. um: Cleanup SIGTERM handling um: ubd: Introduce submit_request() um: ubd: Add REQ_FLUSH suppport um: Implement probe_kernel_read() um: hostfs: Fix writeback
2013-09-09irq/of: Fix comment typo for irq_of_parse_and_mapYijing Wang
Fix trivial comment typo for irq_of_parse_and_map(). Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Grant Likely <grant.likely@linaro.org>
2013-09-09Merge branch 'x86/spinlocks' of ↵Konrad Rzeszutek Wilk
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into stable/for-linus-3.12 * 'x86/spinlocks' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/kvm/guest: Fix sparse warning: "symbol 'klock_waiting' was not declared as static" kvm: Paravirtual ticketlocks support for linux guests running on KVM hypervisor kvm guest: Add configuration support to enable debug information for KVM Guests kvm uapi: Add KICK_CPU and PV_UNHALT definition to uapi xen, pvticketlock: Allow interrupts to be enabled while blocking x86, ticketlock: Add slowpath logic jump_label: Split jumplabel ratelimit x86, pvticketlock: When paravirtualizing ticket locks, increment by 2 x86, pvticketlock: Use callee-save for lock_spinning xen, pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks xen, pvticketlock: Xen implementation for PV ticket locks xen: Defer spinlock setup until boot CPU setup x86, ticketlock: Collapse a layer of functions x86, ticketlock: Don't inline _spin_unlock when using paravirt spinlocks x86, spinlock: Replace pv spinlocks with pv ticketlocks
2013-09-09aio: fix race in ring buffer page lookup introduced by page migration supportBenjamin LaHaise
Prior to the introduction of page migration support in "fs/aio: Add support to aio ring pages migration" / 36bc08cc01709b4a9bb563b35aa530241ddc63e3, mapping of the ring buffer pages was done via get_user_pages() while retaining mmap_sem held for write. This avoided possible races with userland racing an munmap() or mremap(). The page migration patch, however, switched to using mm_populate() to prime the page mapping. mm_populate() cannot be called with mmap_sem held. Instead of dropping the mmap_sem, revert to the old behaviour and simply drop the use of mm_populate() since get_user_pages() will cause the pages to get mapped anyways. Thanks to Al Viro for spotting this issue. Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
2013-09-09ASoC: rsnd: fixup flag name of rsnd_scu_platform_infoKuninori Morimoto
it should be *USE*, not *USB* Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-09ARM: 7835/2: fix modular build of xor_blocks() with NEON enabledArd Biesheuvel
Commit 0195659 introduced a NEON accelerated version of the xor_blocks() function, but it needs the changes in this patch to allow it to be built as a module rather than statically into the kernel. This patch creates a separate module xor-neon.ko which exports the NEON inner xor_blocks() functions depended upon by the regular xor.ko if it is built with CONFIG_KERNEL_MODE_NEON=y Reported-by: Josh Boyer <jwboyer@fedoraproject.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-09-09ALSA: hda - Add CS4208 codec support for MacBook 6,1 and 6,2Takashi Iwai
MacBook 6,1 and 6,2 have a CS4208 codec instead of CS4206/CS4207 on the former models. Most of functions work fine as is, except for the silent speaker output. After debugging sessions, it turned out that the machine needs to set GPIO 0 for the speaker amp. This patch adds the basic support for CS4208 and the fixup for these MacBooks. Basically the codec works just with the generic parser. For re-using the existing GPIO amp code and init/free callbacks, a few places have been changed so that CS4206/4207-specific codes (errata, etc) won't hit with CS4208. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=60811 Reported-and-tested-by: Imre Kaloz <kaloz@openwrt.org> Reported-and-tested-by: Ian Munsie <darkstarsword@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-09-09xen/arm: disable cpuidle and cpufreq when linux is running as dom0Julien Grall
When linux is running as dom0, Xen doesn't show the physical cpu but a virtual CPU. On some ARM SOC (for instance the exynos 5250), linux registers callbacks for cpuidle and cpufreq. When these callbacks are called, they will modify directly the physical cpu not the virtual one. It can impact the whole board instead of only dom0. Signed-off-by: Julien Grall <julien.grall@linaro.org> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2013-09-09xen/p2m: Don't call get_balloon_scratch_page() twice, keep interrupts ↵Boris Ostrovsky
disabled for multicalls m2p_remove_override() calls get_balloon_scratch_page() in MULTI_update_va_mapping() even though it already has pointer to this page from the earlier call (in scratch_page). This second call doesn't have a matching put_balloon_scratch_page() thus not restoring preempt count back. (Also, there is no put_balloon_scratch_page() in the error path.) In addition, the second multicall uses __xen_mc_entry() which does not disable interrupts. Rearrange xen_mc_* calls to keep interrupts off while performing multicalls. This commit fixes a regression introduced by: commit ee0726407feaf504dff304fb603652fb2d778b42 Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Date: Tue Jul 23 17:23:54 2013 +0000 xen/m2p: use GNTTABOP_unmap_and_replace to reinstate the original mapping Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2013-09-09ARM: xen: only set pm function ptrs for Xen guestsRob Herring
xen_pm_init was unconditionally setting pm_power_off and arm_pm_restart function pointers. This breaks multi-platform kernels. Make this conditional on running as a Xen guest and make it a late_initcall to ensure it is setup after platform code for Dom0. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> CC: stable@vger.kernel.org
2013-09-09ALSA: hda - Add Toshiba Satellite C870 to MSI blacklistTakashi Iwai
Toshiba Satellite C870 shows interrupt problems occasionally when certain mixer controls like "Mic Switch" is toggled. This seems worked around by not using MSI. Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=833585 Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-09-09s390/irq: reduce size of external interrupt handler hash arrayHeiko Carstens
Change the hash algorithm a bit so it produces only values in the range of 0..31. This allows to reduce the size of the external interrupt handler hash array even further while making sure that each of the known interrupt sources keeps its unique hash with the slightly modified algorithm: 0x1004 --> 12 0x1201 --> 10 0x1202 --> 11 0x1406 --> 16 0x1407 --> 17 0x2401 --> 19 0x2603 --> 22 0x4000 --> 0 This also means that the entire array now fits into exactly one cache line; so add a proper align statement as well. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2013-09-08autofs4 - fix device ioctl mount lookupIan Kent
When reconnecting to automounts at startup an autofs ioctl is used to find the device and inode of existing mounts so they can be used to open a file descriptor of possibly covered mounts. At this time the the caller might not yet "own" the mount so it can trigger calling ->d_automount(). This causes automount to hang when trying to reconnect to direct or offset mount types. Consequently kern_path() can't be used but kern_path_mountpoint() can be. Signed-off-by: Ian Kent <raven@themaw.net> Cc: Jeff Layton <jlayton@redhat.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-08vfs: fix dentry RCU to refcounting possibly sleeping dput()Linus Torvalds
This is the fix that the last two commits indirectly led up to - making sure that we don't call dput() in a bad context on the dentries we've looked up in RCU mode after the sequence count validation fails. This basically expands d_rcu_to_refcount() into the callers, and then fixes the callers to delay the dput() in the failure case until _after_ we've dropped all locks and are no longer in an RCU-locked region. The case of 'complete_walk()' was trivial, since its failure case did the unlock_rcu_walk() directly after the call to d_rcu_to_refcount(), and as such that is just a pure expansion of the function with a trivial movement of the resulting dput() to after 'unlock_rcu_walk()'. In contrast, the unlazy_walk() case was much more complicated, because not only does convert two different dentries from RCU to be reference counted, but it used to not call unlock_rcu_walk() at all, and instead just returned an error and let the caller clean everything up in "terminate_walk()". Happily, one of the dentries in question (called "parent" inside unlazy_walk()) is the dentry of "nd->path", which terminate_walk() wants a refcount to anyway for the non-RCU case. So what the new and improved unlazy_walk() does is to first turn that dentry into a refcounted one, and once that is set up, the error cases can continue to use the terminate_walk() helper for cleanup, but for the non-RCU case. Which makes it possible to drop out of RCU mode if we actually hit the sequence number failure case. Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-09virtio_pci: pm: Use CONFIG_PM_SLEEP instead of CONFIG_PMAaron Lu
The virtio_pci_freeze/restore are defined under CONFIG_PM but is used by SET_SYSTEM_SLEEP_PM_OPS macro, which is defined under CONFIG_PM_SLEEP. So if CONFIG_PM_SLEEP is not cofigured but CONFIG_PM_RUNTIME is, the following warning message appeared: drivers/virtio/virtio_pci.c:770:12: warning: ‘virtio_pci_freeze’ defined but not used [-Wunused-function] static int virtio_pci_freeze(struct device *dev) ^ drivers/virtio/virtio_pci.c:790:12: warning: ‘virtio_pci_restore’ defined but not used [-Wunused-function] static int virtio_pci_restore(struct device *dev) ^ Fix it by changing CONFIG_PM to CONFIG_PM_SLEEP. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-09-08introduce kern_path_mountpoint()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-08rename user_path_umountat() to user_path_mountpoint_at()Al Viro
... and move the extern from linux/namei.h to fs/internal.h, along with that of vfs_path_lookup(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-08take unlazy_walk() into umount_lookup_last()Al Viro
... and massage it a bit to reduce nesting Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-08CIFS: Replace clientCanCache* bools with an integerPavel Shilovsky
that prepare the code to handle different types of SMB2 leases. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2013-09-08vfs: use lockred "dead" flag to mark unrecoverably dead dentriesLinus Torvalds
This simplifies the RCU to refcounting code in particular. I was originally intending to leave this for later, but walking through all the dput() logic (see previous commit), I realized that the dput() "might_sleep()" check was misleadingly weak. And I removed it as misleading, both for performance profiling and for debugging. However, the might_sleep() debugging case is actually true: the final dput() can indeed sleep, if the inode of the dentry that you are releasing ends up sleeping at iput time (see dentry_iput()). So the problem with the might_sleep() in dput() wasn't that it wasn't true, it was that it wasn't actually testing and triggering on the interesting case. In particular, just about *any* dput() can indeed sleep, if you happen to race with another thread deleting the file in question, and you then lose the race to the be the last dput() for that file. But because it's a very rare race, the debugging code would never trigger it in practice. Why is this problematic? The new d_rcu_to_refcount() (see commit 15570086b590: "vfs: reimplement d_rcu_to_refcount() using lockref_get_or_lock()") does a dput() for the failure case, and it does it under the RCU lock. So potentially sleeping really is a bug. But there's no way I'm going to fix this with the previous complicated "lockref_get_or_lock()" interface. And rather than revert to the old and crufty nested dentry locking code (which did get this right by delaying the reference count updates until they were verified to be safe), let's make forward progress. Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-08vfs: reorganize dput() memory accessesLinus Torvalds
This is me being a bit OCD after all the dentry optimization work this merge window: profiles end up showing 'dput()' as a rather expensive operation, and there were two unrelated bad reasons for that. The first reason was reading d_lockref.count for debugging purposes, which touches the lockref cacheline (for reads) before really need to. More importantly, the debugging test in question is _wrong_, and has hidden bugs. It's true that we can only sleep when the count goes down to zero, but the test as-is hides the much more subtle bug that happens if we race with somebody else deleting the file. Anyway we _will_ touch that cacheline, but let's do it for a write and in the right routine (ie in "lockref_put_or_lock()") which annotates the costs better. So remove the misleading debug code. The other was an unnecessary access to the cacheline that contains the d_lru list, just to check whether we already were on the LRU list or not. This is exactly what we have d_flags for, so that we can avoid touching extra cache lines for the common case. So just add another bit for "is this dentry on the LRU". Finally, mark the tests properly likely/unlikely, so that the common fast-paths are dense in the instruction stream. This makes the profiles look much saner. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-08[CIFS] quiet sparse compile warningSteve French
Jeff's patchset introduced trivial sparse warning on new cifs toupper routine Signed-off-by: Steve French <smfrench@gmail.com> CC: Jeff Layton <jlayton@redhat.com>
2013-09-08cifs: Start using per session key for smb2/3 for signature generationShirish Pargaonkar
Switch smb2 code to use per session session key and smb3 code to use per session signing key instead of per connection key to generate signatures. For that, we need to find a session to fetch the session key to generate signature to match for every request and response packet. We also forgo checking signature for a session setup response from the server. Acked-by: Jeff Layton <jlayton@samba.org> Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>