- 19 12月, 2009 5 次提交
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由 Heiko Carstens 提交于
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Oleg Nesterov 提交于
Nobody except ptrace itself should use task->ptrace or PT_PTRACED directly, change arch/s390/kernel/traps.c to use the helper. Signed-off-by: NOleg Nesterov <oleg@redhat.com> Acked-by: NRoland McGrath <roland@redhat.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Martin Schwidefsky 提交于
The elf notes number for the upper register halves is s390 specific. Change the name of the elf notes to include S390. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Roel Kluin 提交于
Return the PTR_ERR of the correct pointer. Signed-off-by: NRoel Kluin <roel.kluin@gmail.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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由 Heiko Carstens 提交于
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 18 12月, 2009 5 次提交
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由 Frederic Weisbecker 提交于
The kbuild's select command doesn't propagate through the config dependencies. Hence the current rules of hardware breakpoint's config can't ensure perf can never be disabled under us. We have: config X86 selects HAVE_HW_BREAKPOINTS config HAVE_HW_BREAKPOINTS select PERF_EVENTS config PERF_EVENTS [...] x86 will select the breakpoints but that won't propagate to perf events. The user can still disable the latter, but it is necessary for the breakpoints. What we need is: - x86 selects HAVE_HW_BREAKPOINTS and PERF_EVENTS - HAVE_HW_BREAKPOINTS depends on PERF_EVENTS so that we ensure PERF_EVENTS is enabled and frozen for x86. This fixes the following kind of build errors: In file included from arch/x86/kernel/hw_breakpoint.c:31: include/linux/hw_breakpoint.h: In function 'hw_breakpoint_addr': include/linux/hw_breakpoint.h:39: error: 'struct perf_event' has no member named 'attr' v2: Select also ANON_INODES from x86, required for perf Reported-by: NCyrill Gorcunov <gorcunov@gmail.com> Reported-by: NMichal Marek <mmarek@suse.cz> Reported-by: NAndrew Randrianasulu <randrik_a@yahoo.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1261010034-7786-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Suresh Siddha 提交于
John Blackwood reported: > on an older Dell PowerEdge 6650 system with 8 cpus (4 are hyper-threaded), > and 32 bit (x86) kernel, once you change the irq smp_affinity of an irq > to be less than all cpus in the system, you can never change really the > irq smp_affinity back to be all cpus in the system (0xff) again, > even though no error status is returned on the "/bin/echo ff > > /proc/irq/[n]/smp_affinity" operation. > > This is due to that fact that BAD_APICID has the same value as > all cpus (0xff) on 32bit kernels, and thus the value returned from > set_desc_affinity() via the cpu_mask_to_apicid_and() function is treated > as a failure in set_ioapic_affinity_irq_desc(), and no affinity changes > are made. set_desc_affinity() is already checking if the incoming cpu mask intersects with the cpu online mask or not. So there is no need for the apic op cpu_mask_to_apicid_and() to check again and return BAD_APICID. Remove the BAD_APICID return value from cpu_mask_to_apicid_and() and also fix set_desc_affinity() to return -1 instead of using BAD_APICID to represent error conditions (as cpu_mask_to_apicid_and() can return logical or physical apicid values and BAD_APICID is really to represent bad physical apic id). Reported-by: NJohn Blackwood <john.blackwood@ccur.com> Root-caused-by: NJohn Blackwood <john.blackwood@ccur.com> Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <1261103386.2535.409.camel@sbs-t61> Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
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It says Warning: objdump version is older than 2.19 Warning: Skipping posttest. because it used the wrong field from `objdump -v': akpm:/usr/src/25> /opt/crosstool/gcc-4.0.2-glibc-2.3.6/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-objdump -v GNU objdump 2.16.1 Copyright 2005 Free Software Foundation, Inc. This program is free software; you may redistribute it under the terms of the GNU General Public License. This program has absolutely no warranty. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> LKML-Reference: <200912172326.nBHNQaQl024796@imap1.linux-foundation.org> Signed-off-by: NH. Peter Anvin <hpa@zytor.com> Cc: Masami Hiramatsu <mhiramat@redhat.com>
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由 Pallipadi, Venkatesh 提交于
Commit 83ce4009 did the following change If the TSC is constant and non-stop, also set it reliable. But, there seems to be few systems that will end up with TSC warp across sockets, depending on how the cpus come out of reset. Skipping TSC sync test on such systems may result in time inconsistency later. So, reenable TSC sync test even on constant and non-stop TSC systems. Set, sched_clock_stable to 1 by default and reset it in mark_tsc_unstable, if TSC sync fails. This change still gives perf benefit mentioned in 83ce4009 for systems where TSC is reliable. Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com> Acked-by: NSuresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20091217202702.GA18015@linux-os.sc.intel.com> Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
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由 Christoph Hellwig 提交于
Proper Posix O_SYNC handling only made it into 2.6.33, not 2.6.32. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 17 12月, 2009 30 次提交
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由 Ben Dooks 提交于
Add pseudo-DMA by FIQ to the S3C24XX SPI driver. This allows the driver to get DMA-like performance where there are either no free DMA channels or when doing transfers that required both TX and RX data paths. Since this patch requires the addition of an assembly file to hold the FIQ code, we rename the module (instead of adding a rename of the .c file to this patch). We expect most users are loading this via udev and thus there should be no change to the userland configuration. Signed-off-by: NBen Dooks <ben@simtec.co.uk> Signed-off-by: NSimtec Linux Team <linux@simtec.co.uk> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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由 Linus Torvalds 提交于
The loop condition is fragile: we compare an unsigned value to zero, and then decrement it by something larger than one in the loop. All the callers should be passing in appropriately aligned buffer lengths, but it's better to just not rely on it, and have some appropriate defensive loop limits. Acked-by: NRoland McGrath <roland@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Roland Dreier 提交于
Not all awk implementations (including the default awk in Ubuntu 9.10) support POSIX character classes. Since x86-opcode-map.txt is plain ASCII, we can just use explicit ranges for lower case, alphabetic, and alphanumeric characters instead. Signed-off-by: NRoland Dreier <rolandd@cisco.com> Acked-by: NMasami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <adabphy750b.fsf@roland-alpha.cisco.com> Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
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由 Chen Liqin 提交于
Signed-off-by: NCui Bixiong <bixiong@sunnorth.com.cn> Signed-off-by: NChen Liqin <liqin.chen@sunplusct.com>
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由 Chen Liqin 提交于
Signed-off-by: NCui Bixiong <bixiong@sunnorth.com.cn> Signed-off-by: NChen Liqin <liqin.chen@sunplusct.com> modified: arch/score/include/asm/page.h modified: arch/score/kernel/setup.c modified: arch/score/mm/init.c
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由 Chen Liqin 提交于
Signed-off-by: NCui Bixiong <bixiong@sunnorth.com.cn> Signed-off-by: NChen Liqin <liqin.chen@sunplusct.com> modified: arch/score/include/asm/cacheflush.h modified: arch/score/mm/cache.c
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由 Frederic Weisbecker 提交于
perf events, x86/stacktrace: Fix performance/softlockup by providing a special frame pointer-only stack walker It's just wasteful for stacktrace users like perf to walk through every entries on the stack whereas these only accept reliable ones, ie: that the frame pointer validates. Since perf requires pure reliable stacktraces, it needs a stack walker based on frame pointers-only to optimize the stacktrace processing. This might solve some near-lockup scenarios that can be triggered by call-graph tracing timer events. Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1261024834-5336-2-git-send-regression-fweisbec@gmail.com> [ v2: fix for modular builds and small detail tidyup ] Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Frederic Weisbecker 提交于
The current print_context_stack helper that does the stack walking job is good for usual stacktraces as it walks through all the stack and reports even addresses that look unreliable, which is nice when we don't have frame pointers for example. But we have users like perf that only require reliable stacktraces, and those may want a more adapted stack walker, so lets make this function a callback in stacktrace_ops that users can tune for their needs. Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1261024834-5336-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ralf Baechle 提交于
Commit 16393192 "sysctl mips/lasat: Remove dead binary sysctl support" obviously wasn't test built ... Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Ralf Baechle 提交于
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Martin Michlmayr 提交于
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: NMartin Michlmayr <tbm@cyrius.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/663/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Dmitri Vorobiev 提交于
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: NDmitri Vorobiev <dmitri.vorobiev@movial.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/689/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Ralf Baechle 提交于
The platform has never been fully merged Signed-off-by: NRalf 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: NDavid Woodhouse <David.Woodhouse@intel.com> Acked-by: NWim Van Sebroeck <wim@iguana.be>
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由 Wu Zhangjin 提交于
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: NWu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org http://patchwork.linux-mips.org/patch/727/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/706/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Uwe Kleine-König 提交于
The function iodev_remove is used only wrapped by __devexit_p so define it using __devexit. Signed-off-by: NUwe 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: NRalf Baechle <ralf@linux-mips.org>
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由 Alexey Dobriyan 提交于
Signed-off-by: NAlexey 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: NRalf Baechle <ralf@linux-mips.org>
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由 Ralf Baechle 提交于
Signed-off-by: NRalf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/709/
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由 Ralf Baechle 提交于
Away with the daemons of ifdef; get ready for future COP2 users. Signed-off-by: NRalf Baechle <ralf@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/708/
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由 Ralf Baechle 提交于
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/683/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/685/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
YeeLoong2F has a KB3310b embedded controller. Add basic operations for future related drivers and board support. Signed-off-by: NWu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/684/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Dmitri Vorobiev 提交于
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: NDmitri Vorobiev <dmitri.vorobiev@movial.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/698/Acked-by: NFlorian Fainelli <florian@openwrt.org> Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu 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: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu 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: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu 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: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu 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: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu 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: NRalf Baechle <ralf@linux-mips.org>
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由 Wu Zhangjin 提交于
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: NWu 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: NFrederic Weisbecker <fweisbec@gmail.com> Patchwork: http://patchwork.linux-mips.org/patch/676/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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