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x86: correct/clarify comment in nops.h

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<asm-x86/nops.h> describes certain multibyte instructions as
"generic" nops when in fact they aren't nops at all in 64-bit
mode (missing REX.W causing truncation of a register).

Update the comment to state that K8 or P6 style nops should be
used in 64-bit mode. This matches what the alternatives code does.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mikael Pettersson 2008-03-11 16:43:31 +01:00 committed by Ingo Molnar
parent 1415d160c7
commit 5d570cbbf2
1 changed files with 2 additions and 0 deletions
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include/asm-x86/nops.h
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@ -5,6 +5,8 @@
/* generic versions from gas /* generic versions from gas
1: nop 1: nop
the following instructions are NOT nops in 64-bit mode,
for 64-bit mode use K8 or P6 nops instead
2: movl %esi,%esi 2: movl %esi,%esi
3: leal 0x00(%esi),%esi 3: leal 0x00(%esi),%esi
4: leal 0x00(,%esi,1),%esi 4: leal 0x00(,%esi,1),%esi