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2011-03-15fs/9p: Add v9fs_inodeAneesh Kumar K.V
Switch to the fscache code to v9fs_inode. We will later use v9fs_inode in cache=loose mode to track the inode cache validity timeout. Ie if we find an inode in cache older that a specific jiffie range we will consider it stale Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Don't set stat.st_blocks based on nrpagesAneesh Kumar K.V
simple_getattr does set stat.st_blocks to a value derived from nrpages. That is not correct with 9p Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add inode hashingAneesh Kumar K.V
We didn't add the inode to inode hash in 9p. We need to do that to get sync to work, otherwise __mark_inode_dirty will not add the inode to super block's dirty list. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: We need not writeback dirty pages during closeAneesh Kumar K.V
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Implement syncfs call back for 9PfsAneesh Kumar K.V
FIXME!! what about dotu ? Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15net/9p: Implement syncfs 9P operationAneesh Kumar K.V
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Mark file system with MS_SYNCHRONOUS only if it is not cached modeAneesh Kumar K.V
We should not mark file system synchronous if mounted cache=* option Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Clarify cached dentry delete operationAneesh Kumar K.V
Update the comment to indicate that we don't want to cache negative dentries. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add buffered write support for v9fs.Aneesh Kumar K.V
We can now support writeable mmaps. Based on the original patch from Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add fid to inode in cached modeAneesh Kumar K.V
The fid attached to inode will be opened O_RDWR mode and is used for dirty page writeback only. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add read write helper functionAneesh Kumar K.V
We add read write helper function here which will be used later by the mmap patch Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: [fscache] wait for page write in cached modeAneesh Kumar K.V
We need to call fscache_wait_on_page_write in launder_page for fscache Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: increment inode->i_count in cached mode.Aneesh Kumar K.V
We need to ihold even in cached mode Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: set fs cache cookie in create path alsoAneesh Kumar K.V
We need to call v9fs_cache_inode_set_cookie in create path also Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: set the cached file_operations struct during inode initAneesh Kumar K.V
With the old code we were not setting the file->f_op with cached file operations during creat. (format correction by jvrao@linux.vnet.ibm.com) Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Small non-IO PDUs for zero-copy supporting transports.Venkateswararao Jujjuri (JV)
If a transport prefers payload to be sent separate from the PDU (P9_TRANS_PREF_PAYLOAD_SEP), there is no need to allocate msize PDU buffers(struct p9_fcall). This patch allocates only upto 4k buffers for this kind of transports and there won't be any change to the legacy transports. Hence, this patch on top of zero copy changes allows user to specify higher msizes through the mount option without hogging the kernel heap. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Handle Zero Copy TREAD/RERROR case in !dotl case.Venkateswararao Jujjuri (JV)
This takes care of copying out error buffers from user buffer payloads when we are using zero copy. This happens because the only payload buffer the server has to respond to the request is the user buffer given for the zero copy read. Because we only use zerocopy when the amount of data to transfer is greater than a certain size (currently 4K) and error strings are limited to ERRMAX (currently 128) we don't need to worry about there being sufficient space for the error to fit in the payload. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] readdir zerocopy changes for 9P2000.L protocol.Venkateswararao Jujjuri (JV)
Modify p9_client_readdir() to check the transport preference and act according If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload separately instead of putting it directly on PDU. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Write side zerocopy changes for 9P2000.L protocol.Venkateswararao Jujjuri (JV)
Modify p9_client_write() to check the transport preference and act accordingly. If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload separately instead of putting it directly on PDU. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Read side zerocopy changes for 9P2000.L protocol.Venkateswararao Jujjuri (JV)
Modify p9_client_read() to check the transport preference and act accordingly. If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload separately instead of putting it directly on PDU. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Add preferences to transport layer.Venkateswararao Jujjuri (JV)
This patch adds preferences field to the p9_trans_module. Through this, now transport layer can express its preference about the payload. i.e if payload neds to be part of the PDU or it prefers it to be sent sepearetly so that the transport layer can handle it in a better way. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Add gup/zero_copy support to VirtIO transport layer.Venkateswararao Jujjuri (JV)
Modify p9_virtio_request() and req_done() functions to support additional payload sent down to the transport layer through tc->pubuf and tc->pkbuf. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Assign type of transaction to tc->pdu->id which is otherwise unsed.Venkateswararao Jujjuri (JV)
This will be used by the transport layer to determine the out going request type. Transport layer uses this information to correctly place the mapped pages in the PDU. Patches following this will make use of this to achieve zero copy. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Preparation and helper functions for zero copyVenkateswararao Jujjuri (JV)
This patch prepares p9_fcall structure for zero copy. Added fields send the payload buffer information to the transport layer. In addition it adds a 'private' field for the transport layer to store mapped/pinned page information so that it can be freed/unpinned during req_done. This patch also creates trans_common.[ch] to house helper functions. It adds the following helper functions. p9_release_req_pages - Release pages after the transaction. p9_nr_pages - Return number of pages needed to accomodate the payload. payload_gup - Translates user buffer into kernel pages. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[fs/9p] Make access=client default in 9p2000.L protocolVenkateswararao Jujjuri (JV)
Current code sets access=user as default for all protocol versions. This patch chagnes it to "client" only for dotl. User can always specify particular access mode with -o access= option. No change there. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[fs/9P] Add posixacl mount optionVenkateswararao Jujjuri (JV)
The mount option access=client is overloaded as it assumes acl too. Adding posixacl option to enable POSIX ACLs makes it explicit and clear. Also it is convenient in the future to add other types of acls like richacls. Ideally, the access mode 'client' should be just like V9FS_ACCESS_USER except it underscores the location of access check. Traditional 9P protocol lets the server perform access checks but with this mode, all the access checks will be performed on the client itself. Server just follows the client's directive. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[fs/9p] Ignore acl mount option when CONFIG_9P_FS_POSIX_ACL is not defined.Venkateswararao Jujjuri (JV)
If the kernel is not compiled with CONFIG_9P_FS_POSIX_ACL and the mount option is specified to enable ACLs current code fails the mount. This patch brings the behavior inline with other filesystems like ext3 by proceeding with the mount and log a warning to syslog. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[fs/9p] Initialze cached acls both in cached/uncached mode.Venkateswararao Jujjuri (JV)
With create/mkdir/mknod in non cached mode we initialize the inode using v9fs_get_inode. v9fs_get_inode doesn't initialize the cache inode value to NULL. This is causing to trip on BUG_ON in v9fs_get_cached_acl. Fix is to initialize acls to NULL and not to leave them in ACL_NOT_CACHED state. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
2011-03-15[fs/9p] Plug potential acl leakVenkateswararao Jujjuri (JV)
In v9fs_get_acl() if __v9fs_get_acl() gets only one of the dacl/pacl we are not releasing it. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
2011-03-14Linux 2.6.38v2.6.38Linus Torvalds
2011-03-14Merge branch 'fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300 * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300: MN10300: atomic_read() should ensure it emits a load MN10300: The SMP_ICACHE_INV_FLUSH_RANGE IPI command does not exist MN10300: Proper use of macros get_user() in the case of incremented pointers
2011-03-14Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linusLinus Torvalds
* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: (26 commits) MIPS: Alchemy: Fix reset for MTX-1 and XXS1500 MIPS: MTX-1: Make au1000_eth probe all PHY addresses MIPS: Jz4740: Add HAVE_CLK MIPS: Move idle task creation to work queue MIPS, Perf-events: Use unsigned delta for right shift in event update MIPS, Perf-events: Work with the new callchain interface MIPS, Perf-events: Fix event check in validate_event() MIPS, Perf-events: Work with the new PMU interface MIPS, Perf-events: Work with irq_work MIPS: Fix always CONFIG_LOONGSON_UART_BASE=y MIPS: Loongson: Fix potentially wrong string handling MIPS: Fix GCC-4.6 'set but not used' warning in arch/mips/mm/init.c MIPS: Fix GCC-4.6 'set but not used' warning in ieee754int.h MIPS: Remove unused code from arch/mips/kernel/syscall.c MIPS: Fix GCC-4.6 'set but not used' warning in signal*.c MIPS: MSP: Fix MSP71xx bpci interrupt handler return value MIPS: Select R4K timer lib for all MSP platforms MIPS: Loongson: Remove ad-hoc cmdline default MIPS: Clear the correct flag in sysmips(MIPS_FIXADE, ...). MIPS: Add an unreachable return statement to satisfy buggy GCCs. ...
2011-03-14Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: ce4100: Set pci ops via callback instead of module init x86/mm: Fix pgd_lock deadlock x86/mm: Handle mm_fault_error() in kernel space x86: Don't check for BIOS corruption in first 64K when there's no need to
2011-03-14Revert "oom: oom_kill_process: fix the child_points logic"Linus Torvalds
This reverts the parent commit. I hate doing that, but it's generating some discussion ("half of it is right"), and since I am planning on doing the 2.6.38 release later today we can punt it to stable if required. Let's not rock the boat right now. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-14oom: oom_kill_process: fix the child_points logicOleg Nesterov
oom_kill_process() starts with victim_points == 0. This means that (most likely) any child has more points and can be killed erroneously. Also, "children has a different mm" doesn't match the reality, we should check child->mm != t->mm. This check is not exactly correct if t->mm == NULL but this doesn't really matter, oom_kill_task() will kill them anyway. Note: "Kill all processes sharing p->mm" in oom_kill_task() is wrong too. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-14MIPS: Alchemy: Fix reset for MTX-1 and XXS1500Florian Fainelli
Since commit 32fd6901 (MIPS: Alchemy: get rid of common/reset.c) Alchemy-based boards use their own reset function. For MTX-1 and XXS1500, the reset function pokes at the BCSR.SYSTEM_RESET register, but this does not work. According to Bruno Randolf, this was not tested when written. Previously, the generic au1000_restart() routine called the board specific reset function, which for MTX-1 and XXS1500 did not work, but finally made a jump to the reset vector, which really triggers a system restart. Fix reboot for both targets by jumping to the reset vector. Signed-off-by: Florian Fainelli <florian@openwrt.org> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2093/ Acked-by: Bruno Randolf <br1@einfach.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: MTX-1: Make au1000_eth probe all PHY addressesFlorian Fainelli
When au1000_eth probes the MII bus for PHY address, if we do not set au1000_eth platform data's phy_search_highest_address, the MII probing logic will exit early and will assume a valid PHY is found at address 0. For MTX-1, the PHY is at address 31, and without this patch, the link detection/speed/duplex would not work correctly. CC: stable@kernel.org Signed-off-by: Florian Fainelli <florian@openwrt.org> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2111/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Jz4740: Add HAVE_CLKMaurus Cuelenaere
Jz4740 supports the clock framework but doesn't have HAVE_CLK defined, so define it! Signed-off-by: Maurus Cuelenaere <mcuelenaere@gmail.com> To: linux-mips@linux-mips.org To: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/2112/ Acked-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Move idle task creation to work queueMaksim Rayskiy
To avoid forking usermode thread when creating an idle task, move fork_idle to a work queue. If kernel starts with maxcpus= option which does not bring all available cpus online at boot time, idle tasks for offline cpus are not created. If later offline cpus are hotplugged through sysfs, __cpu_up is called in the context of the user task, and fork_idle copies its non-zero mm pointer. This causes BUG() in per_cpu_trap_init. This also avoids issues with resource limits of the CPU writing to sysfs, containers, maybe others. Signed-off-by: Maksim Rayskiy <mrayskiy@broadcom.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2070/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS, Perf-events: Use unsigned delta for right shift in event updateDeng-Cheng Zhu
Leverage the commit for ARM by Will Deacon: - 446a5a8b1eb91a6990e5c8fe29f14e7a95b69132 ARM: 6205/1: perf: ensure counter delta is treated as unsigned Hardware performance counters on ARM are 32-bits wide but atomic64_t variables are used to represent counter data in the hw_perf_event structure. The armpmu_event_update function right-shifts a signed 64-bit delta variable and adds the result to the event count. This can lead to shifting in sign-bits if the MSB of the 32-bit counter value is set. This results in perf output such as: Performance counter stats for 'sleep 20': 18446744073460670464 cycles <-- 0xFFFFFFFFF12A6000 7783773 instructions # 0.000 IPC 465 context-switches 161 page-faults 1172393 branches 20.154242147 seconds time elapsed This patch ensures that the delta value is treated as unsigned so that the right shift sets the upper bits to zero. Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: a.p.zijlstra@chello.nl To: fweisbec@gmail.com To: will.deacon@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: wuzhangjin@gmail.com Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: matt@console-pimps.org Cc: sshtylyov@mvista.com Patchwork: http://patchwork.linux-mips.org/patch/2015/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS, Perf-events: Work with the new callchain interfaceDeng-Cheng Zhu
This is the MIPS part of the following commits by Frederic Weisbecker: - f72c1a931e311bb7780fee19e41a89ac42cab50e perf: Factorize callchain context handling Store the kernel and user contexts from the generic layer instead of archs, this gathers some repetitive code. - 56962b4449af34070bb1994621ef4f0265eed4d8 perf: Generalize some arch callchain code - Most archs use one callchain buffer per cpu, except x86 that needs to deal with NMIs. Provide a default perf_callchain_buffer() implementation that x86 overrides. - Centralize all the kernel/user regs handling and invoke new arch handlers from there: perf_callchain_user() / perf_callchain_kernel() That avoid all the user_mode(), current->mm checks and so... - Invert some parameters in perf_callchain_*() helpers: entry to the left, regs to the right, following the traditional (dst, src). - 70791ce9ba68a5921c9905ef05d23f62a90bc10c perf: Generalize callchain_store() callchain_store() is the same on every archs, inline it in perf_event.h and rename it to perf_callchain_store() to avoid any collision. This removes repetitive code. - c1a65932fd7216fdc9a0db8bbffe1d47842f862c perf: Drop unappropriate tests on arch callchains Drop the TASK_RUNNING test on user tasks for callchains as this check doesn't seem to make any sense. Also remove the tests for !current that is not supposed to happen and current->pid as this should be handled at the generic level, with exclude_idle attribute. Reported-by: Wu Zhangjin <wuzhangjin@gmail.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: a.p.zijlstra@chello.nl To: will.deacon@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: dengcheng.zhu@gmail.com Cc: matt@console-pimps.org Cc: sshtylyov@mvista.com Patchwork: http://patchwork.linux-mips.org/patch/2014/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS, Perf-events: Fix event check in validate_event()Deng-Cheng Zhu
Ignore events that are in off/error state or belong to a different PMU. This patch originates from the following commit for ARM by Will Deacon: - 65b4711ff513767341aa1915c822de6ec0de65cb ARM: 6352/1: perf: fix event validation The validate_event function in the ARM perf events backend has the following problems: 1.) Events that are disabled count towards the cost. 2.) Events associated with other PMUs [for example, software events or breakpoints] do not count towards the cost, but do fail validation, causing the group to fail. This patch changes validate_event so that it ignores events in the PERF_EVENT_STATE_OFF state or that are scheduled for other PMUs. Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: a.p.zijlstra@chello.nl To: fweisbec@gmail.com To: will.deacon@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: wuzhangjin@gmail.com Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: dengcheng.zhu@gmail.com Cc: matt@console-pimps.org Cc: sshtylyov@mvista.com Cc: ddaney@caviumnetworks.com Patchwork: http://patchwork.linux-mips.org/patch/2013/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS, Perf-events: Work with the new PMU interfaceDeng-Cheng Zhu
This is the MIPS part of the following commits by Peter Zijlstra: - a4eaf7f14675cb512d69f0c928055e73d0c6d252 perf: Rework the PMU methods Replace pmu::{enable,disable,start,stop,unthrottle} with pmu::{add,del,start,stop}, all of which take a flags argument. The new interface extends the capability to stop a counter while keeping it scheduled on the PMU. We replace the throttled state with the generic stopped state. This also allows us to efficiently stop/start counters over certain code paths (like IRQ handlers). It also allows scheduling a counter without it starting, allowing for a generic frozen state (useful for rotating stopped counters). The stopped state is implemented in two different ways, depending on how the architecture implemented the throttled state: 1) We disable the counter: a) the pmu has per-counter enable bits, we flip that b) we program a NOP event, preserving the counter state 2) We store the counter state and ignore all read/overflow events For MIPSXX, the stopped state is implemented in the way of 1.b as above. - 33696fc0d141bbbcb12f75b69608ea83282e3117 perf: Per PMU disable Changes perf_disable() into perf_pmu_disable(). - 24cd7f54a0d47e1d5b3de29e2456bfbd2d8447b7 perf: Reduce perf_disable() usage Since the current perf_disable() usage is only an optimization, remove it for now. This eases the removal of the __weak hw_perf_enable() interface. - b0a873ebbf87bf38bf70b5e39a7cadc96099fa13 perf: Register PMU implementations Simple registration interface for struct pmu, this provides the infrastructure for removing all the weak functions. - 51b0fe39549a04858001922919ab355dee9bdfcf perf: Deconstify struct pmu sed -ie 's/const struct pmu\>/struct pmu/g' `git grep -l "const struct pmu\>"` Reported-by: Wu Zhangjin <wuzhangjin@gmail.com> Acked-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: a.p.zijlstra@chello.nl To: fweisbec@gmail.com To: will.deacon@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: wuzhangjin@gmail.com Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: dengcheng.zhu@gmail.com Cc: matt@console-pimps.org Cc: sshtylyov@mvista.com Cc: ddaney@caviumnetworks.com Patchwork: http://patchwork.linux-mips.org/patch/2012/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS, Perf-events: Work with irq_workDeng-Cheng Zhu
This is the MIPS part of the following commit by Peter Zijlstra: - e360adbe29241a0194e10e20595360dd7b98a2b3 irq_work: Add generic hardirq context callbacks Provide a mechanism that allows running code in IRQ context. It is most useful for NMI code that needs to interact with the rest of the system -- like wakeup a task to drain buffers. Perf currently has such a mechanism, so extract that and provide it as a generic feature, independent of perf so that others may also benefit. The IRQ context callback is generated through self-IPIs where possible, or on architectures like powerpc the decrementer (the built-in timer facility) is set to generate an interrupt immediately. Architectures that don't have anything like this get to do with a callback from the timer tick. These architectures can call irq_work_run() at the tail of any IRQ handlers that might enqueue such work (like the perf IRQ handler) to avoid undue latencies in processing the work. For MIPSXX, we need to call irq_work_run() at the tail of the perf IRQ handler as described above. Reported-by: Wu Zhangjin <wuzhangjin@gmail.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: fweisbec@gmail.com To: will.deacon@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: matt@console-pimps.org Cc: sshtylyov@mvista.com, Patchwork: http://patchwork.linux-mips.org/patch/2011/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Fix always CONFIG_LOONGSON_UART_BASE=yYoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/2055/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Loongson: Fix potentially wrong string handlingStefan Weil
This error was reported by cppcheck: arch/mips/loongson/common/machtype.c:56: error: Dangerous usage of 'str' (strncpy doesn't always 0-terminate it) If strncpy copied MACHTYPE_LEN bytes, the destination string str was not terminated. The patch adds one more byte to str and makes sure that this byte is always 0. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Arnaud Patard <apatard@mandriva.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/2053/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Fix GCC-4.6 'set but not used' warning in arch/mips/mm/init.cDavid Daney
Under some combinations of CONFIG_*, lastpfn in page_is_ram is 'set but not used'. Mark it as __maybe_unused to quiet the warning/error. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2033/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Fix GCC-4.6 'set but not used' warning in ieee754int.hDavid Daney
GCC-4.6 can find more unused code than previous versions could. In the case of arch/mips/math-emu/ieee754int.h, the COMPXSP and COMPXDP macros are used in several places, but a couple of them leave xs unused. The easiest thing to do is mark it as __maybe_unused to quiet the warning. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2032/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Remove unused code from arch/mips/kernel/syscall.cDavid Daney
The variable arg3 in _sys_sysmips() is unused. Remove it. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2034/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-03-14MIPS: Fix GCC-4.6 'set but not used' warning in signal*.cDavid Daney
GCC-4.6 can find more unused code than previous versions could. In the case of protected_restore_fp_context{,32}, the variable tmp is really used. Its use is tricky in that we really care about the side effects of the __put_user() calls. So we must mark tmp with __maybe_unused to quiet the warning. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2035/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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