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linux/arch/x86/lib
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Ville Syrjälä 65ea11ec6a x86/hweight: Don't clobber %rdi 
The caller expects %rdi to remain intact, push+pop it make that happen.

Fixes the following kind of explosions on my core2duo machine when
trying to reboot or shut down:

  general protection fault: 0000 [#1] PREEMPT SMP
  Modules linked in: i915 i2c_algo_bit drm_kms_helper cfbfillrect syscopyarea cfbimgblt sysfillrect sysimgblt fb_sys_fops cfbcopyarea drm netconsole configfs binfmt_misc iTCO_wdt psmouse pcspkr snd_hda_codec_idt e100 coretemp hwmon snd_hda_codec_generic i2c_i801 mii i2c_smbus lpc_ich mfd_core snd_hda_intel uhci_hcd snd_hda_codec snd_hwdep snd_hda_core ehci_pci 8250 ehci_hcd snd_pcm 8250_base usbcore evdev serial_core usb_common parport_pc parport snd_timer snd soundcore
  CPU: 0 PID: 3070 Comm: reboot Not tainted 4.8.0-rc1-perf-dirty #69
  Hardware name:                  /D946GZIS, BIOS TS94610J.86A.0087.2007.1107.1049 11/07/2007
  task: ffff88012a0b4080 task.stack: ffff880123850000
  RIP: 0010:[<ffffffff81003c92>]  [<ffffffff81003c92>] x86_perf_event_update+0x52/0xc0
  RSP: 0018:ffff880123853b60  EFLAGS: 00010087
  RAX: 0000000000000001 RBX: ffff88012fc0a3c0 RCX: 000000000000001e
  RDX: 0000000000000000 RSI: 0000000040000000 RDI: ffff88012b014800
  RBP: ffff880123853b88 R08: ffffffffffffffff R09: 0000000000000000
  R10: ffffea0004a012c0 R11: ffffea0004acedc0 R12: ffffffff80000001
  R13: ffff88012b0149c0 R14: ffff88012b014800 R15: 0000000000000018
  FS:  00007f8b155cd700(0000) GS:ffff88012fc00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f8b155f5000 CR3: 000000012a2d7000 CR4: 00000000000006f0
  Stack:
   ffff88012fc0a3c0 ffff88012b014800 0000000000000004 0000000000000001
   ffff88012fc1b750 ffff880123853bb0 ffffffff81003d59 ffff88012b014800
   ffff88012fc0a3c0 ffff88012b014800 ffff880123853bd8 ffffffff81003e13
  Call Trace:
   [<ffffffff81003d59>] x86_pmu_stop+0x59/0xd0
   [<ffffffff81003e13>] x86_pmu_del+0x43/0x140
   [<ffffffff8111705d>] event_sched_out.isra.105+0xbd/0x260
   [<ffffffff8111738d>] __perf_remove_from_context+0x2d/0xb0
   [<ffffffff8111745d>] __perf_event_exit_context+0x4d/0x70
   [<ffffffff810c8826>] generic_exec_single+0xb6/0x140
   [<ffffffff81117410>] ? __perf_remove_from_context+0xb0/0xb0
   [<ffffffff81117410>] ? __perf_remove_from_context+0xb0/0xb0
   [<ffffffff810c898f>] smp_call_function_single+0xdf/0x140
   [<ffffffff81113d27>] perf_event_exit_cpu_context+0x87/0xc0
   [<ffffffff81113d73>] perf_reboot+0x13/0x40
   [<ffffffff8107578a>] notifier_call_chain+0x4a/0x70
   [<ffffffff81075ad7>] __blocking_notifier_call_chain+0x47/0x60
   [<ffffffff81075b06>] blocking_notifier_call_chain+0x16/0x20
   [<ffffffff81076a1d>] kernel_restart_prepare+0x1d/0x40
   [<ffffffff81076ae2>] kernel_restart+0x12/0x60
   [<ffffffff81076d56>] SYSC_reboot+0xf6/0x1b0
   [<ffffffff811a823c>] ? mntput_no_expire+0x2c/0x1b0
   [<ffffffff811a83e4>] ? mntput+0x24/0x40
   [<ffffffff811894fc>] ? __fput+0x16c/0x1e0
   [<ffffffff811895ae>] ? ____fput+0xe/0x10
   [<ffffffff81072fc3>] ? task_work_run+0x83/0xa0
   [<ffffffff81001623>] ? exit_to_usermode_loop+0x53/0xc0
   [<ffffffff8100105a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
   [<ffffffff81076e6e>] SyS_reboot+0xe/0x10
   [<ffffffff814c4ba5>] entry_SYSCALL_64_fastpath+0x18/0xa3
  Code: 7c 4c 8d af c0 01 00 00 49 89 fe eb 10 48 09 c2 4c 89 e0 49 0f b1 55 00 4c 39 e0 74 35 4d 8b a6 c0 01 00 00 41 8b 8e 60 01 00 00 <0f> 33 8b 35 6e 02 8c 00 48 c1 e2 20 85 f6 7e d2 48 89 d3 89 cf
  RIP  [<ffffffff81003c92>] x86_perf_event_update+0x52/0xc0
   RSP <ffff880123853b60>
  ---[ end trace 7ec95181faf211be ]---
  note: reboot[3070] exited with preempt_count 2

Cc: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Fixes: f5967101e9 ("x86/hweight: Get rid of the special calling convention")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-08 10:58:25 -07:00
..
.gitignore
atomic64_32.c
atomic64_386_32.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
atomic64_cx8_32.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
cache-smp.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
checksum_32.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
clear_page_64.S x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
cmdline.c x86/boot: Pass in size to early cmdline parsing 2016-02-03 12:03:18 +01:00
cmpxchg8b_emu.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
cmpxchg16b_emu.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
copy_page_64.S x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
copy_user_64.S x86/uaccess: Move thread_info::addr_limit to thread_struct 2016-07-15 10:26:30 +02:00
cpu.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
csum-copy_64.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
csum-partial_64.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
csum-wrappers_64.c Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-08-01 14:23:42 -04:00
delay.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
getuser.S x86/uaccess: Move thread_info::addr_limit to thread_struct 2016-07-15 10:26:30 +02:00
hweight.S x86/hweight: Don't clobber %rdi 2016-08-08 10:58:25 -07:00
inat.c
insn.c x86/insn: Add AVX-512 support to the instruction decoder 2016-07-21 09:37:11 -03:00
iomap_copy_64.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
kaslr.c x86/mm: Refactor KASLR entropy functions 2016-07-08 17:33:45 +02:00
Makefile Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-25 17:32:28 -07:00
memcpy_32.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
memcpy_64.S x86/mm, x86/mce: Fix return type/value for memcpy_mcsafe() 2016-03-16 09:02:18 +01:00
memmove_64.S x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
memset_64.S Merge branch 'x86/cleanups' into x86/urgent 2016-03-17 09:44:57 +01:00
misc.c x86/boot: Further compress CPUs bootup message 2013-10-01 10:52:30 +02:00
mmx_32.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
msr-reg-export.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
msr-reg.S x86/debug: Remove perpetually broken, unmaintainable dwarf annotations 2015-06-02 07:57:48 +02:00
msr-smp.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
msr.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
putuser.S x86/uaccess: Move thread_info::addr_limit to thread_struct 2016-07-15 10:26:30 +02:00
rwsem.S locking/rwsem: Fix comment on register clobbering 2016-05-16 12:35:40 +02:00
string_32.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
strstr_32.c
usercopy_32.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
usercopy_64.c Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-08-01 14:23:42 -04:00
usercopy.c x86/lib: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:58 +02:00
x86-opcode-map.txt libnvdimm for 4.8 2016-07-28 17:38:16 -07:00