- 07 12月, 2011 1 次提交
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip由 Linus Torvalds 提交于
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: ftrace: Fix hash record accounting bug perf: Fix parsing of __print_flags() in TP_printk() jump_label: jump_label_inc may return before the code is patched ftrace: Remove force undef config value left for testing tracing: Restore system filter behavior tracing: fix event_subsystem ref counting
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- 06 12月, 2011 22 次提交
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git://cavan.codon.org.uk/platform-drivers-x86由 Linus Torvalds 提交于
* 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86: toshiba_acpi: Fix machines that don't support HCI_SYSTEM_EVENT
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip由 Linus Torvalds 提交于
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: intr_remapping: Fix section mismatch in ir_dev_scope_init() intel-iommu: Fix section mismatch in dmar_parse_rmrr_atsr_dev() x86, amd: Fix up numa_node information for AMD CPU family 15h model 0-0fh northbridge functions x86, AMD: Correct align_va_addr documentation x86/rtc, mrst: Don't register a platform RTC device for for Intel MID platforms x86/mrst: Battery fixes x86/paravirt: PTE updates in k(un)map_atomic need to be synchronous, regardless of lazy_mmu mode x86: Fix "Acer Aspire 1" reboot hang x86/mtrr: Resolve inconsistency with Intel processor manual x86: Document rdmsr_safe restrictions x86, microcode: Fix the failure path of microcode update driver init code Add TAINT_FIRMWARE_WORKAROUND on MTRR fixup x86/mpparse: Account for bus types other than ISA and PCI x86, mrst: Change the pmic_gpio device type to IPC mrst: Added some platform data for the SFI translations x86,mrst: Power control commands update x86/reboot: Blacklist Dell OptiPlex 990 known to require PCI reboot x86, UV: Fix UV2 hub part number x86: Add user_mode_vm check in stack_overflow_check
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip由 Linus Torvalds 提交于
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf: Fix loss of notification with multi-event perf, x86: Force IBS LVT offset assignment for family 10h perf, x86: Disable PEBS on SandyBridge chips trace_events_filter: Use rcu_assign_pointer() when setting ftrace_event_call->filter perf session: Fix crash with invalid CPU list perf python: Fix undefined symbol problem perf/x86: Enable raw event access to Intel offcore events perf: Don't use -ENOSPC for out of PMU resources perf: Do not set task_ctx pointer in cpuctx if there are no events in the context perf/x86: Fix PEBS instruction unwind oprofile, x86: Fix crash when unloading module (nmi timer mode) oprofile: Fix crash when unloading module (hr timer mode)
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip由 Linus Torvalds 提交于
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: clockevents: Set noop handler in clockevents_exchange_device() tick-broadcast: Stop active broadcast device when replacing it clocksource: Fix bug with max_deferment margin calculation rtc: Fix some bugs that allowed accumulating time drift in suspend/resume rtc: Disable the alarm in the hardware
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由 Linus Torvalds 提交于
Merge branches 'core-urgent-for-linus' and 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: slab, lockdep: Fix silly bug * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq: Fix race condition when stopping the irq thread
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip由 Linus Torvalds 提交于
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched, x86: Avoid unnecessary overflow in sched_clock sched: Fix buglet in return_cfs_rq_runtime() sched: Avoid SMT siblings in select_idle_sibling() if possible sched: Set the command name of the idle tasks in SMP kernels sched, rt: Provide means of disabling cross-cpu bandwidth sharing sched: Document wait_for_completion_*() return values sched_fair: Fix a typo in the comment describing update_sd_lb_stats sched: Add a comment to effective_load() since it's a pain
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git://git390.marist.edu/pub/scm/linux-2.6由 Linus Torvalds 提交于
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: [S390] ap: Setup timer for sending messages after reset. [S390] cio: fix chsc_chp_vary [S390] cio: provide fake irb for transport mode IO [S390] cio: disallow driver io for known to be broken paths [S390] hibernate: directly trigger subchannel evaluation [S390] remove reset of system call restart on psw changes [S390] add missing .set function for NT_S390_LAST_BREAK regset [S390] fix page change underindication in pgste_update_all [S390] ptrace inferior call interactions with TIF_SYSCALL [S390] kdump: Replace is_kdump_kernel() with OLDMEM_BASE check
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由 Linus Walleij 提交于
I screwed up by compiling that driver for the machine rather than the arch. Correcting this fixes the build error. Cc: Grant Likely <grant.likely@secretlab.ca> Reported-by: NMike Frysinger <vapier@gentoo.org> Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Steven Rostedt 提交于
If the set_ftrace_filter is cleared by writing just whitespace to it, then the filter hash refcounts will be decremented but not updated. This causes two bugs: 1) No functions will be enabled for tracing when they all should be 2) If the users clears the set_ftrace_filter twice, it will crash ftrace: ------------[ cut here ]------------ WARNING: at /home/rostedt/work/git/linux-trace.git/kernel/trace/ftrace.c:1384 __ftrace_hash_rec_update.part.27+0x157/0x1a7() Modules linked in: Pid: 2330, comm: bash Not tainted 3.1.0-test+ #32 Call Trace: [<ffffffff81051828>] warn_slowpath_common+0x83/0x9b [<ffffffff8105185a>] warn_slowpath_null+0x1a/0x1c [<ffffffff810ba362>] __ftrace_hash_rec_update.part.27+0x157/0x1a7 [<ffffffff810ba6e8>] ? ftrace_regex_release+0xa7/0x10f [<ffffffff8111bdfe>] ? kfree+0xe5/0x115 [<ffffffff810ba51e>] ftrace_hash_move+0x2e/0x151 [<ffffffff810ba6fb>] ftrace_regex_release+0xba/0x10f [<ffffffff8112e49a>] fput+0xfd/0x1c2 [<ffffffff8112b54c>] filp_close+0x6d/0x78 [<ffffffff8113a92d>] sys_dup3+0x197/0x1c1 [<ffffffff8113a9a6>] sys_dup2+0x4f/0x54 [<ffffffff8150cac2>] system_call_fastpath+0x16/0x1b ---[ end trace 77a3a7ee73794a02 ]--- Link: http://lkml.kernel.org/r/20111101141420.GA4918@debianReported-by: NRabin Vincent <rabin@rab.in> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
A update is made to the sched:sched_switch event that adds some logic to the first parameter of the __print_flags() that shows the state of tasks. This change cause perf to fail parsing the flags. A simple fix is needed to have the parser be able to process ops within the argument. Cc: stable@vger.kernel.org Reported-by: NAndrew Vagin <avagin@openvz.org> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Gleb Natapov 提交于
If cpu A calls jump_label_inc() just after atomic_add_return() is called by cpu B, atomic_inc_not_zero() will return value greater then zero and jump_label_inc() will return to a caller before jump_label_update() finishes its job on cpu B. Link: http://lkml.kernel.org/r/20111018175551.GH17571@redhat.com Cc: stable@vger.kernel.org Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NJason Baron <jbaron@redhat.com> Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
A forced undef of a config value was used for testing and was accidently left in during the final commit. This causes x86 to run slower than needed while running function tracing as well as causes the function graph selftest to fail when DYNMAIC_FTRACE is not set. This is because the code in MCOUNT expects the ftrace code to be processed with the config value set that happened to be forced not set. The forced config option was left in by: commit 6331c28c ftrace: Fix dynamic selftest failure on some archs Link: http://lkml.kernel.org/r/20111102150255.GA6973@debian Cc: stable@vger.kernel.org Reported-by: NRabin Vincent <rabin@rab.in> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Li Zefan 提交于
Though not all events have field 'prev_pid', it was allowed to do this: # echo 'prev_pid == 100' > events/sched/filter but commit 75b8e982 (tracing/filter: Swap entire filter of events) broke it without any reason. Link: http://lkml.kernel.org/r/4EAF46CF.8040408@cn.fujitsu.comSigned-off-by: NLi Zefan <lizf@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Ilya Dryomov 提交于
Fix a bug introduced by e9dbfae5, which prevents event_subsystem from ever being released. Ref_count was added to keep track of subsystem users, not for counting events. Subsystem is created with ref_count = 1, so there is no need to increment it for every event, we have nr_events for that. Fix this by touching ref_count only when we actually have a new user - subsystem_open(). Cc: stable@vger.kernel.org Signed-off-by: NIlya Dryomov <idryomov@gmail.com> Link: http://lkml.kernel.org/r/1320052062-7846-1-git-send-email-idryomov@gmail.comSigned-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Seth Forshee 提交于
The Satellite C670-10V generates notifications for hotkeys but does not support HCI_SYSTEM_EVENT. As a result when a hotkey is pressed it gets stuck in an infinite loop in toshiba_acpi_notify. To fix this, detect whether or not HCI_SYSTEM_EVENT is supported up-front and don't try to read system events if it isn't supported. In addition, limit the number of retries when reading HCI_SYSTEM_EVENT fails so that this loop cannot run unbounded. Signed-off-by: NSeth Forshee <seth.forshee@canonical.com> Signed-off-by: NMatthew Garrett <mjg@redhat.com>
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由 Sergey Senozhatsky 提交于
Fix: Section mismatch in reference from the function ir_dev_scope_init() to the function .init.text:dmar_dev_scope_init() The function ir_dev_scope_init() references the function __init dmar_dev_scope_init(). Signed-off-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Youquan Song <youquan.song@intel.com> Cc: Ohad Ben-Cohen <ohad@wizery.com> Link: http://lkml.kernel.org/r/20111026161507.GB10103@swordfishSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Sergey Senozhatsky 提交于
dmar_parse_rmrr_atsr_dev() calls rmrr_parse_dev() and atsr_parse_dev() which are both marked as __init. Section mismatch in reference from the function dmar_parse_rmrr_atsr_dev() to the function .init.text:dmar_parse_dev_scope() The function dmar_parse_rmrr_atsr_dev() references the function __init dmar_parse_dev_scope(). Section mismatch in reference from the function dmar_parse_rmrr_atsr_dev() to the function .init.text:dmar_parse_dev_scope() The function dmar_parse_rmrr_atsr_dev() references the function __init dmar_parse_dev_scope(). Signed-off-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: iommu@lists.linux-foundation.org Cc: Joerg Roedel <joerg.roedel@amd.com> Cc: Ohad Ben-Cohen <ohad@wizery.com> Link: http://lkml.kernel.org/r/20111026154539.GA10103@swordfishSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Andreas Herrmann 提交于
I've received complaints that the numa_node attribute for family 15h model 00-0fh (e.g. Interlagos) northbridge functions shows -1 instead of the proper node ID. Correct this with attached quirks (similar to quirks for other AMD CPU families used in multi-socket systems). Signed-off-by: NAndreas Herrmann <andreas.herrmann3@amd.com> Cc: Frank Arnold <frank.arnold@amd.com> Cc: Borislav Petkov <borislav.petkov@amd.com> Link: http://lkml.kernel.org/r/20111202072143.GA31916@alberich.amd.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Borislav Petkov 提交于
Commit dfb09f9b ("x86, amd: Avoid cache aliasing penalties on AMD family 15h") introduced a kernel command line parameter called 'align_va_addr' which still refers to arguments used in an earlier version of the patch and which got changed without updating the documentation. Correct that omission. Signed-off-by: NBorislav Petkov <borislav.petkov@amd.com> Cc: Frank Arnold <frank.arnold@amd.com> Link: http://lkml.kernel.org/r/1321873819-29541-1-git-send-email-bp@amd64.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Mathias Nyman 提交于
Intel MID x86 platforms have a memory mapped virtual RTC instead. No MID platform have the default ports (and accessing them may do weird stuff). Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: NAlan Cox <alan@linux.intel.com> Cc: feng.tang@intel.com Cc: Feng Tang <feng.tang@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Major Lee 提交于
When DCDC input line over current detecting, PMIC will change charging current automatically. Logging event is enough. Signed-off-by: NMajor Lee <major_lee@wistron.com> Signed-off-by: NAlan Cox <alan@linux.intel.com> Cc: Mathias Nyman <mathias.nyman@linux.intel.com> Cc: Feng Tang <feng.tang@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> [fix build] Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Konrad Rzeszutek Wilk 提交于
Fix an outstanding issue that has been reported since 2.6.37. Under a heavy loaded machine processing "fork()" calls could crash with: BUG: unable to handle kernel paging request at f573fc8c IP: [<c01abc54>] swap_count_continued+0x104/0x180 *pdpt = 000000002a3b9027 *pde = 0000000001bed067 *pte = 0000000000000000 Oops: 0000 [#1] SMP Modules linked in: Pid: 1638, comm: apache2 Not tainted 3.0.4-linode37 #1 EIP: 0061:[<c01abc54>] EFLAGS: 00210246 CPU: 3 EIP is at swap_count_continued+0x104/0x180 .. snip.. Call Trace: [<c01ac222>] ? __swap_duplicate+0xc2/0x160 [<c01040f7>] ? pte_mfn_to_pfn+0x87/0xe0 [<c01ac2e4>] ? swap_duplicate+0x14/0x40 [<c01a0a6b>] ? copy_pte_range+0x45b/0x500 [<c01a0ca5>] ? copy_page_range+0x195/0x200 [<c01328c6>] ? dup_mmap+0x1c6/0x2c0 [<c0132cf8>] ? dup_mm+0xa8/0x130 [<c013376a>] ? copy_process+0x98a/0xb30 [<c013395f>] ? do_fork+0x4f/0x280 [<c01573b3>] ? getnstimeofday+0x43/0x100 [<c010f770>] ? sys_clone+0x30/0x40 [<c06c048d>] ? ptregs_clone+0x15/0x48 [<c06bfb71>] ? syscall_call+0x7/0xb The problem is that in copy_page_range() we turn lazy mode on, and then in swap_entry_free() we call swap_count_continued() which ends up in: map = kmap_atomic(page, KM_USER0) + offset; and then later we touch *map. Since we are running in batched mode (lazy) we don't actually set up the PTE mappings and the kmap_atomic is not done synchronously and ends up trying to dereference a page that has not been set. Looking at kmap_atomic_prot_pfn(), it uses 'arch_flush_lazy_mmu_mode' and doing the same in kmap_atomic_prot() and __kunmap_atomic() makes the problem go away. Interestingly, commit b8bcfe99 ("x86/paravirt: remove lazy mode in interrupts") removed part of this to fix an interrupt issue - but it went to far and did not consider this scenario. Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: <stable@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 05 12月, 2011 17 次提交
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由 Peter Chubb 提交于
Looks like on some Acer Aspire 1s with older bioses, reboot via bios fails. It works on my machine, (with BIOS version 0.3310) but not on some others (BIOS version 0.3309). There's a log of problems at: https://bbs.archlinux.org/viewtopic.php?id=124136 This patch adds a different callback to the reboot quirk table, to allow rebooting via keybaord controller. Reported-by: NUroš Vampl <mobile.leecher@gmail.com> Tested-by: NVasily Khoruzhick <anarsoul@gmail.com> Signed-off-by: NPeter Chubb <peter.chubb@nicta.com.au> Cc: Don Zickus <dzickus@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: stable@kernel.org Link: http://lkml.kernel.org/r/1323093233-9481-1-git-send-email-anarsoul@gmail.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ajaykumar Hotchandani 提交于
Following is from Notes of section 11.5.3 of Intel processor manual available at: http://www.intel.com/Assets/PDF/manual/325384.pdf For the Pentium 4 and Intel Xeon processors, after the sequence of steps given above has been executed, the cache lines containing the code between the end of the WBINVD instruction and before the MTRRS have actually been disabled may be retained in the cache hierarchy. Here, to remove code from the cache completely, a second WBINVD instruction must be executed after the MTRRs have been disabled. This patch provides resolution for that. Ideally, I will like to make changes only for Pentium 4 and Xeon processors. But, I am not finding easier way to do it. And, extra wbinvd() instruction does not hurt much for other processors. Signed-off-by: NAjaykumar Hotchandani <ajaykumar.hotchandani@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi> Link: http://lkml.kernel.org/r/4EBD1CC5.3030008@oracle.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/urgent
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由 Borislav Petkov 提交于
Recently, I got bitten by using rdmsr_safe too early in the boot process. Document its shortcomings for future reference. Link: http://lkml.kernel.org/r/4ED5B70F.606@lwfinger.netSigned-off-by: NBorislav Petkov <borislav.petkov@amd.com>
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由 Srivatsa S. Bhat 提交于
The microcode update driver's initialization code does not handle failures correctly. This patch fixes this issue. Signed-off-by: NJan Beulich <JBeulich@suse.com> Signed-off-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20111107123530.12164.31227.stgit@srivatsabhat.in.ibm.com Link: http://lkml.kernel.org/r/4ED8E2270200007800065120@nat28.tlf.novell.comSigned-off-by: NBorislav Petkov <borislav.petkov@amd.com>
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由 Prarit Bhargava 提交于
TAINT_FIRMWARE_WORKAROUND should be set when an MTRR fixup is done. Signed-off-by: NPrarit Bhargava <prarit@redhat.com> Acked-by: NDavid Rientjes <rientjes@google.com> Link: http://lkml.kernel.org/r/1318958650-12447-1-git-send-email-prarit@redhat.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Bjorn Helgaas 提交于
In commit f8924e77 ("x86: unify mp_bus_info"), the 32-bit and 64-bit versions of MP_bus_info were rearranged to match each other better. Unfortunately it introduced a regression: prior to that change we used to always set the mp_bus_not_pci bit, then clear it if we found a PCI bus. After it, we set mp_bus_not_pci for ISA buses, clear it for PCI buses, and leave it alone otherwise. In the cases of ISA and PCI, there's not much difference. But ISA is not the only non-PCI bus, so it's better to always set mp_bus_not_pci and clear it only for PCI. Without this change, Dan's Dell PowerEdge 4200 panics on boot with a log indicating interrupt routing trouble unless the "noapic" option is supplied. With this change, the machine boots reliably without "noapic". Fixes http://bugs.debian.org/586494Reported-bisected-and-tested-by: NDan McGrath <troubledaemon@gmail.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org # 2.6.26+ Cc: Dan McGrath <troubledaemon@gmail.com> Cc: Alexey Starikovskiy <aystarik@gmail.com> [jrnieder@gmail.com: clarified commit message] Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Link: http://lkml.kernel.org/r/20111122215000.GA9151@elie.hsd1.il.comcast.netSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Feng Tang 提交于
In latest firmware's SFI tables, pmic_gpio has been set to IPC type of device, so we need handle it too. Signed-off-by: NFeng Tang <feng.tang@intel.com> Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jekyll Lai 提交于
Add SFI glue for the following devices: tca6416: a gpio expander compatible with max7315 mpu3050: gyro sensor Both of these actual drivers are already upstream Signed-off-by: NJekyll Lai <jekyll_lai@wistron.com> Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jacob Pan 提交于
On the Intel MID devices SCU commands are issued to manage power off and the like. We need to issue different ones for non-Lincroft based devices. Signed-off-by: NAlek Du <alek.du@intel.com> Signed-off-by: NJacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Rafael J. Wysocki 提交于
Dell OptiPlex 990 is known to require PCI reboot, so add it to the reboot blacklist in pci_reboot_dmi_table[]. Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl> Link: http://lkml.kernel.org/r/201111160019.51303.rjw@sisk.plSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jack Steiner 提交于
There was a mixup when the SGI UV2 hub chip was sent to be fabricated, and it ended up with the wrong part number in the HRP_NODE_ID mmr. Future versions of the chip will (may) have the correct part number. Change the UV infrastructure to recognize both part numbers as valid IDs of a UV2 hub chip. Signed-off-by: NJack Steiner <steiner@sgi.com> Link: http://lkml.kernel.org/r/20111129210058.GA20452@sgi.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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由 Mitsuo Hayasaka 提交于
The kernel stack overflow is checked in stack_overflow_check(), which may wrongly detect the overflow if the stack pointer in user space points to the kernel stack intentionally or accidentally. So, the actual overflow is never detected after this misdetection because WARN_ONCE() is used on the detection of it. This patch adds user-mode-vm checking before it to avoid this problem and bails out early if the user stack is used. Signed-off-by: NMitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> Cc: yrl.pp-manager.tt@hitachi.com Cc: Randy Dunlap <rdunlap@xenotime.net> Link: http://lkml.kernel.org/r/20111129060821.11076.55315.stgit@ltc219.sdl.hitachi.co.jpSigned-off-by: NIngo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com>
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由 Peter Zijlstra 提交于
Commit 30765b92 ("slab, lockdep: Annotate the locks before using them") moves the init_lock_keys() call from after g_cpucache_up = FULL, to before it. And overlooks the fact that init_node_lock_keys() tests for it and ignores everything !FULL. Introduce a LATE stage and change the lockdep test to be <LATE. Acked-by: NChristoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: stable@kernel.org Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Peter Zijlstra 提交于
When you do: $ perf record -e cycles,cycles,cycles noploop 10 You expect about 10,000 samples for each event, i.e., 10s at 1000samples/sec. However, this is not what's happening. You get much fewer samples, maybe 3700 samples/event: $ perf report -D | tail -15 Aggregated stats: TOTAL events: 10998 MMAP events: 66 COMM events: 2 SAMPLE events: 10930 cycles stats: TOTAL events: 3644 SAMPLE events: 3644 cycles stats: TOTAL events: 3642 SAMPLE events: 3642 cycles stats: TOTAL events: 3644 SAMPLE events: 3644 On a Intel Nehalem or even AMD64, there are 4 counters capable of measuring cycles, so there is plenty of space to measure those events without multiplexing (even with the NMI watchdog active). And even with multiplexing, we'd expect roughly the same number of samples per event. The root of the problem was that when the event that caused the buffer to become full was not the first event passed on the cmdline, the user notification would get lost. The notification was sent to the file descriptor of the overflowed event but the perf tool was not polling on it. The perf tool aggregates all samples into a single buffer, i.e., the buffer of the first event. Consequently, it assumes notifications for any event will come via that descriptor. The seemingly straight forward solution of moving the waitq into the ringbuffer object doesn't work because of life-time issues. One could perf_event_set_output() on a fd that you're also blocking on and cause the old rb object to be freed while its waitq would still be referenced by the blocked thread -> FAIL. Therefore link all events to the ringbuffer and broadcast the wakeup from the ringbuffer object to all possible events that could be waited upon. This is rather ugly, and we're open to better solutions but it works for now. Reported-by: NStephane Eranian <eranian@google.com> Finished-by: NStephane Eranian <eranian@google.com> Reviewed-by: NStephane Eranian <eranian@google.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20111126014731.GA7030@quadSigned-off-by: NIngo Molnar <mingo@elte.hu>
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