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2010-02-20MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itselfRussell King
On VIVT ARM, when we have multiple shared mappings of the same file in the same MM, we need to ensure that we have coherency across all copies. We do this via make_coherent() by making the pages uncacheable. This used to work fine, until we allowed highmem with highpte - we now have a page table which is mapped as required, and is not available for modification via update_mmu_cache(). Ralf Beache suggested getting rid of the PTE value passed to update_mmu_cache(): On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables to construct a pointer to the pte again. Passing a pte_t * is much more elegant. Maybe we might even replace the pte argument with the pte_t? Ben Herrenschmidt would also like the pte pointer for PowerPC: Passing the ptep in there is exactly what I want. I want that -instead- of the PTE value, because I have issue on some ppc cases, for I$/D$ coherency, where set_pte_at() may decide to mask out the _PAGE_EXEC. So, pass in the mapped page table pointer into update_mmu_cache(), and remove the PTE value, updating all implementations and call sites to suit. Includes a fix from Stephen Rothwell: sparc: fix fallout from update_mmu_cache API change Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-01-12MIPS: Ignore vmlinux.*Yoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips <linux-mips@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/795/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Move vmlinux.ecoff to arch/mips/bootYoichi Yuasa
It moves to the same directory as the boot files in other formats. Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips <linux-mips@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/796/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: cpumask_of_node() should handle -1 as a nodeAnton Blanchard
pcibus_to_node can return -1 if we cannot determine which node a pci bus is on. If passed -1, cpumask_of_node will negatively index the lookup array and pull in random data: # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpus 00000000,00000003,00000000,00000000 # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpulist 64-65 Change cpumask_of_node to check for -1 and return cpu_all_mask in this case: # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpus ffffffff,ffffffff,ffffffff,ffffffff # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpulist 0-127 Signed-off-by: Anton Blanchard <anton@samba.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Andrew Morton <akpm@linux-foundation.org> Patchwork: http://patchwork.linux-mips.org/patch/831/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Octeon: Use non-overflowing arithmetic in sched_clockDavid Daney
With typical mult and shift values, the calculation for Octeon's sched_clock overflows when using 64-bit arithmetic. Use 128-bit calculations instead. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/849/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Malta, PowerTV: Remove unnecessary "Linux started"Yoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/813/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: BCM63xx: Remove duplicate CONFIG_CMDLINE.Yoichi Yuasa
Builtin cmdline is copied by arch_mem_init(). Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/812/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: AR7: Remove unused prom_getchar()Yoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/811/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: PowerTV: Remove extra r4k_clockevent_init() callDavid VomLehn
A call to r4k_clocksource_init() was added to plat_time_init(), but when init_mips_clock_source() calls the same function, boot fails in clockevents_register_device(). This patch removes the extraneous call. Signed-off-by: David VomLehn <dvomlehn@cisco.com> Patchwork: http://patchwork.linux-mips.org/patch/803/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Cobalt use strlcat() for the command line argumentsYoichi Yuasa
Tested with CoLo v1.22 Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/807/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Octeon: Add sched_clock() to csrc-octeon.cDavid Daney
With the advent of function graph tracing on MIPS, Octeon needs a high precision sched_clock() implementation. Without it, most timing numbers are reported as 0.000. This new sched_clock just uses the 64-bit cycle counter appropriately scaled. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Patchwork: http://patchwork.linux-mips.org/patch/805/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: TXx9: Cleanup builtin-cmdline processingAtsushi Nemoto
Since commit 898d357b5262f9e26bc2418e01f8676e80d9867e (lmo) / 6acc7d485c24c00e111c61b2e6dff9180faebcae (kernel.org) ("Fix and enhance built-in kernel command line") arcs_cmdline[] does not contain built-in command line. The commit introduce CONFIG_CMDLINE_BOOL and CONFIG_CMDLINE_OVERRIDE to control built-in command line, and now we can use them instead of platform-specific built-in command line processing. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Patchwork: http://patchwork.linux-mips.org/patch/802/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: PowerTV: simplify prom_init_cmdline() and merge into prom_init()Yoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/801/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: PowerTV: Remove unused platform_die()Yoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/800/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: PowerTV: Remove mips_machine_halt()Yoichi Yuasa
mips_machine_halt() is same as mips_machine_restart(). Also delete the registration of _machine_halt and pm_power_off because mips_machine_halt() is the restart function. Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/798/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: PowerTV: Remove unused ptv_memsizeYoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/799/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: PowerTV: Remove unused prom_getcmdline()Yoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/797/ Reviewed-by: David VomLehn <dvomlehn@cisco.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: AR7: Remove kgdb_enabledYoichi Yuasa
An unused leftover from the old KGDB implementation. Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/794/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Alchemy: Correct code taking the size of a pointerJulia Lawall
sizeof(dp) is just the size of the pointer. Change it to the size of the referenced structure. A simplified version of the semantic patch that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression *x; expression f; type T; @@ *f(...,(T)x,...) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Patchwork: http://patchwork.linux-mips.org/patch/789/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: BCM63xx: Fix whitespace damaged board_bcm963xx.cFlorian Fainelli
Signed-off-by: Florian Fainelli <ffainelli@freebox.fr> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: VR41xx: Use strlcat() for the command line argumentsYoichi Yuasa
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/784/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Cleanup and Fixup of compressed kernel supportWu Zhangjin
o Remove the .initrd section. The initrd section was already handled when vmlinux was linked. o Discard .MIPS.options, .options, .pdr, .reginfo, .comment and .note sections. If .MIPS.options is not removed, kernels compiled with gcc 3.4.6 will not boot. o Clean up the file format. o Remove several other unneeded sections. Tested with GCC 3.4.6 and 4.4.1 with and without initrd. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/785/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-12MIPS: Cleanup forgotten label_module_alloc in tlbex.cDavid Daney
commit c8af165342e83a4eb078c9607d29a7c399d30a53 (lmo) rsp. e0cc87f59490d7d62a8ab2a76498dc8a2b64927a (kernel.org) left label_module_alloc unused. Remove it now. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/752/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-01-11mm: make totalhigh_pages unsigned longAndreas Fenkart
Makes it consistent with the extern declaration, used when CONFIG_HIGHMEM is set Removes redundant casts in printout messages Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Howells <dhowells@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-17Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linusLinus Torvalds
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: (71 commits) MIPS: Lasat: Fix botched changes to sysctl code. RTC: rtc-cmos.c: Fix warning on MIPS MIPS: Cleanup random differences beween lmo and Linus' kernel. MIPS: No longer hardwire CONFIG_EMBEDDED to y MIPS: Fix and enhance built-in kernel command line MIPS: eXcite: Remove platform. MIPS: Loongson: Cleanups of serial port support MIPS: Lemote 2F: Suspend CS5536 MFGPT Timer MIPS: Excite: move iodev_remove to .devexit.text MIPS: Lasat: Convert to proc_fops / seq_file MIPS: Cleanup signal code initialization MIPS: Modularize COP2 handling MIPS: Move EARLY_PRINTK to Kconfig.debug MIPS: Yeeloong 2F: Cleanup reset logic using the new ec_write function MIPS: Yeeloong 2F: Add LID open event as the wakeup event MIPS: Yeeloong 2F: Add basic EC operations MIPS: Move several variables from .bss to .init.data MIPS: Tracing: Make function graph tracer work with -mmcount-ra-address MIPS: Tracing: Reserve $12(t0) for mcount-ra-address of gcc 4.5 MIPS: Tracing: Make ftrace for MIPS work without -fno-omit-frame-pointer ...
2009-12-17Merge branch 'master' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: kill I_LOCK fold do_sync_file_range into sys_sync_file_range fix up O_SYNC comments VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size fsstack/ecryptfs: remove unused get_nlinks param to fsstack_copy_attr_all vfs: remove extraneous NULL d_inode check from do_filp_open fs: no games with DCACHE_UNHASHED fs: anon_inodes implement dname dio: fix use-after-free
2009-12-17fix up O_SYNC commentsChristoph Hellwig
Proper Posix O_SYNC handling only made it into 2.6.33, not 2.6.32. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-12-17Merge branch 'for-33' of git://repo.or.cz/linux-kbuildLinus Torvalds
* 'for-33' of git://repo.or.cz/linux-kbuild: (29 commits) net: fix for utsrelease.h moving to generated gen_init_cpio: fixed fwrite warning kbuild: fix make clean after mismerge kbuild: generate modules.builtin genksyms: properly consider EXPORT_UNUSED_SYMBOL{,_GPL}() score: add asm/asm-offsets.h wrapper unifdef: update to upstream revision 1.190 kbuild: specify absolute paths for cscope kbuild: create include/generated in silentoldconfig scripts/package: deb-pkg: use fakeroot if available scripts/package: add KBUILD_PKG_ROOTCMD variable scripts/package: tar-pkg: use tar --owner=root Kbuild: clean up marker net: add net_tstamp.h to headers_install kbuild: move utsrelease.h to include/generated kbuild: move autoconf.h to include/generated drop explicit include of autoconf.h kbuild: move compile.h to include/generated kbuild: drop include/asm kbuild: do not check for include/asm-$ARCH ... Fixed non-conflicting clean merge of modpost.c as per comments from Stephen Rothwell (modpost.c had grown an include of linux/autoconf.h that needed to be changed to generated/autoconf.h)
2009-12-17MIPS: Lasat: Fix botched changes to sysctl code.Ralf Baechle
Commit 163931922220e4cb5effd5af1e105038c2f0ab7a "sysctl mips/lasat: Remove dead binary sysctl support" obviously wasn't test built ... Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Cleanup random differences beween lmo and Linus' kernel.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: No longer hardwire CONFIG_EMBEDDED to yMartin Michlmayr
There's no reason for MIPS to select EMBEDDED. In fact, EMBEDDED makes MIPS more awkward to deal with because it makes it different to the majority of architectures for no good reason. [Ralf: Historically disabling EMBEDDED had hid essential options for many MIPS platforms such as serial console and forced crap like VGA support or power managment enabled for platforms where those don't make any sense. The name of the option is also _very_ missleading so many users don't select it even where is was required for a functioning kernel.] Signed-off-by: Martin Michlmayr <tbm@cyrius.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/663/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Fix and enhance built-in kernel command lineDmitri Vorobiev
Currently, MIPS kernels silently overwrite kernel command-line parameters hardcoded in CONFIG_CMDLINE by the ones received from firmware. Therefore, using firmware remains the only reliable method to transfer the command-line parameters, which is not always desirable or convenient, and the CONFIG_CMDLINE option is thereby effectively rendered useless. This patch fixes the problem described above and introduces a more flexible scheme of handling the kernel command line, in a manner identical to what is currently used for x86. The default behavior, i.e. when CONFIG_CMDLINE_BOOL is not defined, retains the existing semantics, and firmware command-line arguments override the hardcoded ones. [Ralf: I fixed up all the defconfig files so the stay unaffected by this change.] Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/689/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: eXcite: Remove platform.Ralf Baechle
The platform has never been fully merged Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Cc: Thomas Koeller <thomas.koeller@baslerweb.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Wim Van Sebroeck <wim@iguana.be> Cc: linux-kernel@vger.kernel.org Cc: linux-mtd@lists.infradead.org Acked-by: David Woodhouse <David.Woodhouse@intel.com> Acked-by: Wim Van Sebroeck <wim@iguana.be>
2009-12-17MIPS: Loongson: Cleanups of serial port supportWu Zhangjin
This patchs uses a loongson_uart_base variable instead of the uart_base[] array and adds a new kernel option to avoid to compile uart_base.c all the time, which will save a little bit of memory for us. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org http://patchwork.linux-mips.org/patch/727/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Lemote 2F: Suspend CS5536 MFGPT TimerWu Zhangjin
Before putting the Loongson 2F into wait mode, suspend the MFGPT Timer and after wake-up resume it. This may save some power. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/706/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Excite: move iodev_remove to .devexit.textUwe Kleine-König
The function iodev_remove is used only wrapped by __devexit_p so define it using __devexit. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Ming Lei <tom.leiming@gmail.com> Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/710/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Lasat: Convert to proc_fops / seq_fileAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: akpm@linux-foundation.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/725/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Cleanup signal code initializationRalf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/709/
2009-12-17MIPS: Modularize COP2 handlingRalf Baechle
Away with the daemons of ifdef; get ready for future COP2 users. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/708/
2009-12-17MIPS: Move EARLY_PRINTK to Kconfig.debugRalf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Yeeloong 2F: Cleanup reset logic using the new ec_write functionWu Zhangjin
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/683/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Yeeloong 2F: Add LID open event as the wakeup eventWu Zhangjin
Yeeloong 2F netbook has an KB3310B embedded controller to manage the LID action. When the LID is closed or opened a SCI interrupt is sent out and the corresponding event is saved to an EC register for later query. Allow the LID open interrupt to wake the processor from wait mode if it is in the suspend mode. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Yeeloong 2F: Add basic EC operationsWu Zhangjin
YeeLoong2F has a KB3310b embedded controller. Add basic operations for future related drivers and board support. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/684/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Move several variables from .bss to .init.dataDmitri Vorobiev
Several static uninitialized variables are used in the scope of __init functions but are themselves not marked as __initdata. This patch is to put those variables to where they belong and to reduce the memory footprint a little bit. Also, a couple of lines with spaces instead of tabs were fixed. Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/698/ Acked-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Tracing: Make function graph tracer work with -mmcount-ra-addressWu Zhangjin
That thread "MIPS: Add option to pass return address location to _mcount" from "David Daney <ddaney@caviumnetworks.com>" have added a new option -mmcount-ra-address to gcc(4.5) for MIPS to transfer the location of the return address to _mcount. Benefit from this new feature, function graph tracer on MIPS will be easier and safer to hijack the return address of the kernel function, which will save some overhead and make the whole thing more reliable. In this patch, at first, try to enable the option -mmcount-ra-address in arch/mips/Makefile with cc-option, if gcc support it, it will be enabled, otherwise, no side effect. and then, we need to support this new option of gcc 4.5 and also support the old gcc versions. with _mcount in the old gcc versions, it's not easy to get the location of return address(tracing: add function graph tracer support for MIPS), so, we do it in a C function: ftrace_get_parent_addr(ftrace.c), but with -mmcount-ra-address, only several instructions need to get what we want, so, I put into asm(mcount.S). and also, as the $12(t0) is used by -mmcount-ra-address for transferring the localtion of return address to _mcount, we need to save it into the stack and restore it when enabled dynamic function tracer, 'Cause we have called "ftrace_call" before "ftrace_graph_caller", which may destroy $12(t0). (Thanks to David for providing that -mcount-ra-address and giving the idea of KBUILD_MCOUNT_RA_ADDRESS, both of them have made the whole thing more beautiful!) Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/681/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Tracing: Reserve $12(t0) for mcount-ra-address of gcc 4.5Wu Zhangjin
A new option -mmcount-ra-address for gcc 4.5 have been sent by David Daney <ddaney@caviumnetworks.com> in the thread "MIPS: Add option to pass return address location to _mcount", which help to record the location of the return address(ra) for the function graph tracer of MIPS to hijack the return address easier and safer. that option used the $12(t0) register by default, so, we reserve it for it, and use t1,t2,t3 instead of t0,t1,t2. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/680/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Tracing: Make ftrace for MIPS work without -fno-omit-frame-pointerWu Zhangjin
When remove the -fno-omit-frame-pointer, gcc will not save the frame pointer for us, we need to save one ourselves. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/679/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Tracing: Add dynamic function graph tracer for MIPSWu Zhangjin
This patch make function graph tracer work with dynamic function tracer. To share the source code of dynamic function tracer(MCOUNT_SAVE_REGS), and avoid restoring the whole saved registers, we need to restore the ra register from the stack. (NOTE: This not work with 32bit! need to ensure why!) Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/678/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Tracing: Add function graph tracer support for MIPSWu Zhangjin
The implementation of function graph tracer for MIPS is a little different from X86. in MIPS, gcc(with -pg) only transfer the caller's return address(at) and the _mcount's return address(ra) to us. For the kernel part without -mlong-calls: move at, ra jal _mcount For the module part with -mlong-calls: lui v1, hi16bit_of_mcount addiu v1, v1, low16bit_of_mcount move at, ra jal _mcount Without -mlong-calls, if the function is a leaf, it will not save the return address(ra): ffffffff80101298 <au1k_wait>: ffffffff80101298: 67bdfff0 daddiu sp,sp,-16 ffffffff8010129c: ffbe0008 sd s8,8(sp) ffffffff801012a0: 03a0f02d move s8,sp ffffffff801012a4: 03e0082d move at,ra ffffffff801012a8: 0c042930 jal ffffffff8010a4c0 <_mcount> ffffffff801012ac: 00020021 nop so, we can hijack it directly in _mcount, but if the function is non-leaf, the return address is saved in the stack. ffffffff80133030 <copy_process>: ffffffff80133030: 67bdff50 daddiu sp,sp,-176 ffffffff80133034: ffbe00a0 sd s8,160(sp) ffffffff80133038: 03a0f02d move s8,sp ffffffff8013303c: ffbf00a8 sd ra,168(sp) ffffffff80133040: ffb70098 sd s7,152(sp) ffffffff80133044: ffb60090 sd s6,144(sp) ffffffff80133048: ffb50088 sd s5,136(sp) ffffffff8013304c: ffb40080 sd s4,128(sp) ffffffff80133050: ffb30078 sd s3,120(sp) ffffffff80133054: ffb20070 sd s2,112(sp) ffffffff80133058: ffb10068 sd s1,104(sp) ffffffff8013305c: ffb00060 sd s0,96(sp) ffffffff80133060: 03e0082d move at,ra ffffffff80133064: 0c042930 jal ffffffff8010a4c0 <_mcount> ffffffff80133068: 00020021 nop but we can not get the exact stack address(which saved ra) directly in _mcount, we need to search the content of at register in the stack space or search the "s{d,w} ra, offset(sp)" instruction in the text. 'Cause we can not prove there is only a match in the stack space, so, we search the text instead. as we can see, if the first instruction above "move at, ra" is not a store instruction, there should be a leaf function, so we hijack the at register directly via putting &return_to_handler into it, otherwise, we search the "s{d,w} ra, offset(sp)" instruction to get the stack offset, and then the stack address. we use the above copy_process() as an example, we at last find "ffbf00a8", 0xa8 is the stack offset, we plus it with s8(fp), that is the stack address, we hijack the content via writing the &return_to_handler in. If with -mlong-calls, since there are two more instructions above "move at, ra", so, we can move the pointer to the position above "lui v1, hi16bit_of_mcount". Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/677/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17MIPS: Tracing: Add IRQENTRY_EXIT section for MIPSWu Zhangjin
This patch add a new section for MIPS to record the block of the hardirq handling for function graph tracer(print_graph_irq) via adding the __irq_entry annotation to the the entrypoints of the hardirqs(the block with irq_enter()...irq_exit()). Thanks goes to Steven & Frederic Weisbecker for their feedbacks. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nicholas Mc Guire <der.herr@hofr.at> Cc: zhangfx@lemote.com Cc: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com> Patchwork: http://patchwork.linux-mips.org/patch/676/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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