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| author | H. Peter Anvin <hpa@zytor.com> | 2009-12-10 01:33:44 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-12-10 01:33:44 +0100 |
| commit | ce9119ad90b1caba550447bfcc0a21850558ca49 (patch) | |
| tree | e7005dcf5ec04848e9ddf33a5b00d11b04ea48f9 /arch | |
| parent | x86: Merge sys_clone (diff) | |
| download | linux-ce9119ad90b1caba550447bfcc0a21850558ca49.tar.xz linux-ce9119ad90b1caba550447bfcc0a21850558ca49.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/entry_32.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 6492555d123d..cb12b9bfc9cc 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -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) \ |