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x86-32: Avoid pipeline serialization in PTREGSCALL1 and 2 

In the PTREGSCALL1 and 2 macros, we can trivially avoid an unnecessary
pipeline serialization, so do so.

In PTREGSCALLS3 this is much less clear-cut since we have to push a
new value to the stack.  Leave it alone for now assuming it is as good
as it is going to be; may want to check on Atom or another in-order
x86 to see if we can do better.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1260403316-5679-2-git-send-email-brgerst@gmail.com>
This commit is contained in:
H. Peter Anvin 2009-12-09 16:33:44 -08:00
parent f839bbc5c8
commit ce9119ad90
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/entry_32.S
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@ -735,15 +735,15 @@ ptregs_##name: \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%edx; \
movl PT_EBX(%edx),%eax; \
movl (PT_EBX+4)(%esp),%eax; \
jmp sys_##name;
#define PTREGSCALL2(name) \
ALIGN; \
ptregs_##name: \
leal 4(%esp),%ecx; \
movl PT_ECX(%ecx),%edx; \
movl PT_EBX(%ecx),%eax; \
movl (PT_ECX+4)(%esp),%edx; \
movl (PT_EBX+4)(%esp),%eax; \
jmp sys_##name;
#define PTREGSCALL3(name) \