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authorMikael Pettersson <mikpe@it.uu.se>2008-03-11 16:43:31 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:40:58 +0200
commit5d570cbbf25a62e9c077f5b351fb142dbfc67288 (patch)
tree8a6958c2cc729741435a3a5d1db697e86cf6436e
parent1415d160c7f7fe8f1026735d5b6cc19aec7a367f (diff)
x86: correct/clarify comment in nops.h
<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>
-rw-r--r--include/asm-x86/nops.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86/nops.h b/include/asm-x86/nops.h
index b3930ae539b..ad0bedd10b8 100644
--- a/include/asm-x86/nops.h
+++ b/include/asm-x86/nops.h
@@ -5,6 +5,8 @@
/* generic versions from gas
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
3: leal 0x00(%esi),%esi
4: leal 0x00(,%esi,1),%esi