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x86/alternatives: Fix p6 nops on non-modular kernels 

Probably a leftover from the early days of self-patching, p6nops
are marked __initconst_or_module, which causes them to be
discarded in a non-modular kernel.  If something later triggers
patching, it will overwrite kernel code with garbage.

Reported-by: Tomas Racek <tracek@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: qemu-devel@nongnu.org
Cc: Anthony Liguori <anthony@codemonkey.ws>
Cc: H. Peter Anvin <hpa@linux.intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Alan Cox <alan@linux.intel.com>
Link: http://lkml.kernel.org/r/5034AE84.90708@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Avi Kivity 2012-08-22 13:03:48 +03:00 committed by Ingo Molnar
parent 2530cd4f44
commit cb09cad44f
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/alternative.c
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@ -165,7 +165,7 @@ static const unsigned char * const k7_nops[ASM_NOP_MAX+2] =
#endif #endif
#ifdef P6_NOP1 #ifdef P6_NOP1
static const unsigned char __initconst_or_module p6nops[] = static const unsigned char p6nops[] =
{ {
P6_NOP1, P6_NOP1,
P6_NOP2, P6_NOP2,