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79c66ce8f6
linux/arch/powerpc
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Anton Blanchard 79c66ce8f6 powerpc/kexec: Fix kexec when using VMX optimised memcpy 
commit b3f271e86e (powerpc: POWER7 optimised memcpy using VMX and
enhanced prefetch) uses VMX when it is safe to do so (ie not in
interrupt). It also looks at the task struct to decide if we have to
save the current tasks' VMX state.

kexec calls memcpy() at a point where the task struct may have been
overwritten by the new kexec segments. If it has been overwritten
then when memcpy -> enable_altivec looks up current->thread.regs->msr
we get a cryptic oops or lockup.

I also notice we aren't initialising thread_info->cpu, which means
smp_processor_id is broken. Fix that too.

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@vger.kernel.org> # 3.6+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-05-14 14:36:23 +10:00
..
boot MMC highlights for 3.10: 2013-05-04 13:45:17 -07:00
configs Merge remote-tracking branch 'kumar/next' into next 2013-04-30 11:10:09 +10:00
crypto powerpc: Fix compile of sha1-powerpc-asm.S on 32-bit 2013-03-05 16:56:26 +11:00
include powerpc: Fix build errors STRICT_MM_TYPECHECKS 2013-05-14 14:36:20 +10:00
kernel powerpc/kexec: Fix kexec when using VMX optimised memcpy 2013-05-14 14:36:23 +10:00
kvm Merge tag 'kvm-3.10-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2013-05-05 14:47:31 -07:00
lib uprobes/powerpc: Add dependency on single step emulation 2013-01-29 11:35:06 +11:00
math-emu
mm powerpc: Fix build errors STRICT_MM_TYPECHECKS 2013-05-14 14:36:20 +10:00
net filter: bpf_jit_comp: refactor and unify BPF JIT image dump output 2013-03-21 17:25:56 -04:00
oprofile Merge branch 'merge' into next 2013-01-29 11:33:37 +11:00
perf powerpc/perf: Enable branch stack sampling framework 2013-04-26 16:13:02 +10:00
platforms powerpc/powernv: Improve kexec reliability 2013-05-10 16:59:18 +10:00
sysdev powerpc: Add an in memory udbg console 2013-05-08 06:36:49 +10:00
xmon Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-05-02 10:16:16 -07:00
Kconfig Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-05-02 10:16:16 -07:00
Kconfig.debug powerpc: Add an in memory udbg console 2013-05-08 06:36:49 +10:00
Makefile powerpc: Avoid load of static chain register when calling nested functions through a pointer on 64bit 2013-01-10 17:01:27 +11:00
relocs_check.pl