leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
2e124b4a39
linux/arch/powerpc/lib
History
Nishanth Aravamudan c8adfeccee powerpc: Fix VMX fix for memcpy case 
In 2fae7cdb60 ("powerpc: Fix VMX in
interrupt check in POWER7 copy loops"), Anton inadvertently
introduced a regression for memcpy on POWER7 machines. copyuser and
memcpy diverge slightly in their use of cr1 (copyuser doesn't use it,
but memcpy does) and you end up clobbering that register with your fix.
That results in (taken from an FC18 kernel):

[   18.824604] Unrecoverable VMX/Altivec Unavailable Exception f20 at c000000000052f40
[   18.824618] Oops: Unrecoverable VMX/Altivec Unavailable Exception, sig: 6 [#1]
[   18.824623] SMP NR_CPUS=1024 NUMA pSeries
[   18.824633] Modules linked in: tg3(+) be2net(+) cxgb4(+) ipr(+) sunrpc xts lrw gf128mul dm_crypt dm_round_robin dm_multipath linear raid10 raid456 async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh_alua squashfs cramfs
[   18.824705] NIP: c000000000052f40 LR: c00000000020b874 CTR: 0000000000000512
[   18.824709] REGS: c000001f1fef7790 TRAP: 0f20   Not tainted  (3.6.0-0.rc6.git0.2.fc18.ppc64)
[   18.824713] MSR: 8000000000009032 <SF,EE,ME,IR,DR,RI>  CR: 4802802e  XER: 20000010
[   18.824726] SOFTE: 0
[   18.824728] CFAR: 0000000000000f20
[   18.824731] TASK = c000000fa7128400[0] 'swapper/24' THREAD: c000000fa7480000 CPU: 24
GPR00: 00000000ffffffc0 c000001f1fef7a10 c00000000164edc0 c000000f9b9a8120
GPR04: c000000f9b9a8124 0000000000001438 0000000000000060 03ffffff064657ee
GPR08: 0000000080000000 0000000000000010 0000000000000020 0000000000000030
GPR12: 0000000028028022 c00000000ff25400 0000000000000001 0000000000000000
GPR16: 0000000000000000 7fffffffffffffff c0000000016b2180 c00000000156a500
GPR20: c000000f968c7a90 c0000000131c31d8 c000001f1fef4000 c000000001561d00
GPR24: 000000000000000a 0000000000000000 0000000000000001 0000000000000012
GPR28: c000000fa5c04f80 00000000000008bc c0000000015c0a28 000000000000022e
[   18.824792] NIP [c000000000052f40] .memcpy_power7+0x5a0/0x7c4
[   18.824797] LR [c00000000020b874] .pcpu_free_area+0x174/0x2d0
[   18.824800] Call Trace:
[   18.824803] [c000001f1fef7a10] [c000000000052c14] .memcpy_power7+0x274/0x7c4 (unreliable)
[   18.824809] [c000001f1fef7b10] [c00000000020b874] .pcpu_free_area+0x174/0x2d0
[   18.824813] [c000001f1fef7bb0] [c00000000020ba88] .free_percpu+0xb8/0x1b0
[   18.824819] [c000001f1fef7c50] [c00000000043d144] .throtl_pd_exit+0x94/0xd0
[   18.824824] [c000001f1fef7cf0] [c00000000043acf8] .blkg_free+0x88/0xe0
[   18.824829] [c000001f1fef7d90] [c00000000018c048] .rcu_process_callbacks+0x2e8/0x8a0
[   18.824835] [c000001f1fef7e90] [c0000000000a8ce8] .__do_softirq+0x158/0x4d0
[   18.824840] [c000001f1fef7f90] [c000000000025ecc] .call_do_softirq+0x14/0x24
[   18.824845] [c000000fa7483650] [c000000000010e80] .do_softirq+0x160/0x1a0
[   18.824850] [c000000fa74836f0] [c0000000000a94a4] .irq_exit+0xf4/0x120
[   18.824854] [c000000fa7483780] [c000000000020c44] .timer_interrupt+0x154/0x4d0
[   18.824859] [c000000fa7483830] [c000000000003be0] decrementer_common+0x160/0x180
[   18.824866] --- Exception: 901 at .plpar_hcall_norets+0x84/0xd4
[   18.824866]     LR = .check_and_cede_processor+0x48/0x80
[   18.824871] [c000000fa7483b20] [c00000000007f018] .check_and_cede_processor+0x18/0x80 (unreliable)
[   18.824877] [c000000fa7483b90] [c00000000007f104] .dedicated_cede_loop+0x84/0x150
[   18.824883] [c000000fa7483c50] [c0000000006bc030] .cpuidle_enter+0x30/0x50
[   18.824887] [c000000fa7483cc0] [c0000000006bc9f4] .cpuidle_idle_call+0x104/0x720
[   18.824892] [c000000fa7483d80] [c000000000070af8] .pSeries_idle+0x18/0x40
[   18.824897] [c000000fa7483df0] [c000000000019084] .cpu_idle+0x1a4/0x380
[   18.824902] [c000000fa7483ec0] [c0000000008a4c18] .start_secondary+0x520/0x528
[   18.824907] [c000000fa7483f90] [c0000000000093f0] .start_secondary_prolog+0x10/0x14
[   18.824911] Instruction dump:
[   18.824914] 38840008 90030000 90e30004 38630008 7ca62850 7cc300d0 78c7e102 7cf01120
[   18.824923] 78c60660 39200010 39400020 39600030 <7e00200c> 7c0020ce 38840010 409f001c
[   18.824935] ---[ end trace 0bb95124affaaa45 ]---
[   18.825046] Unrecoverable VMX/Altivec Unavailable Exception f20 at c000000000052d08

I believe the right fix is to make memcpy match usercopy and not use
cr1.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@kernel.org> [v3.6]
2012-10-04 18:02:43 +10:00
..
alloc.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
checksum_32.S
checksum_64.S powerpc: Merge STK_REG/PARAM/FRAMESIZE 2012-07-10 19:18:03 +10:00
checksum_wrappers_64.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
code-patching.c powerpc: Don't use __put_user() in patch_instruction 2012-09-05 16:05:23 +10:00
copy_32.S powerpc: Fix incorrect .stabs entry for copy_32.S 2010-09-02 14:07:34 +10:00
copypage_64.S powerpc: POWER7 optimised copy_page using VMX and enhanced prefetch 2012-07-03 14:14:44 +10:00
copypage_power7.S powerpc: Merge STK_REG/PARAM/FRAMESIZE 2012-07-10 19:18:03 +10:00
copyuser_64.S powerpc: Change mtcrf to use real register names 2012-07-10 19:18:11 +10:00
copyuser_power7.S powerpc: Fix VMX in interrupt check in POWER7 copy loops 2012-08-24 20:26:09 +10:00
crtsavres.S powerpc: Put the gpr save/restore functions in their own section 2012-07-11 14:19:59 +10:00
devres.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
div64.S powerpc: Fix a corner case in __div64_32 2005-10-20 09:37:02 +10:00
feature-fixups-test.S powerpc: Ensure the else case of feature sections will fit 2011-01-21 14:08:33 +11:00
feature-fixups.c powerpc: Copy down exception vectors after feature fixups 2011-11-16 14:47:54 +11:00
hweight_64.S powerpc: Fix usage of register macros getting ready for %r0 change 2012-07-10 19:17:55 +10:00
ldstfp.S powerpc: Fixes for instructions not using correct register naming 2012-07-10 19:18:16 +10:00
locks.c powerpc: Remove FW_FEATURE ISERIES from arch code 2012-03-21 11:16:11 +11:00
Makefile powerpc: POWER7 optimised memcpy using VMX and enhanced prefetch 2012-07-03 14:14:46 +10:00
mem_64.S powerpc: Change mtcrf to use real register names 2012-07-10 19:18:11 +10:00
memcpy_64.S powerpc: Change mtcrf to use real register names 2012-07-10 19:18:11 +10:00
memcpy_power7.S powerpc: Fix VMX fix for memcpy case 2012-10-04 18:02:43 +10:00
rheap.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
sstep.c powerpc/kprobe: Don't emulate store when kprobe stwu r1 2012-09-18 15:32:45 +10:00
string_64.S powerpc: Optimise the 64bit optimised __clear_user 2012-07-03 14:14:48 +10:00
string.S powerpc: 64bit optimised __clear_user 2012-07-03 14:14:41 +10:00
usercopy_64.c
vmx-helper.c powerpc: POWER7 optimised copy_page using VMX and enhanced prefetch 2012-07-03 14:14:44 +10:00