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authorH. Peter Anvin <hpa@zytor.com>2009-12-09 16:33:44 -0800
committerH. Peter Anvin <hpa@zytor.com>2009-12-09 16:33:44 -0800
commitce9119ad90b1caba550447bfcc0a21850558ca49 (patch)
treee7005dcf5ec04848e9ddf33a5b00d11b04ea48f9 /arch/x86/kernel/entry_32.S
parentf839bbc5c81b1c92ff8e81c360e9564f7b961b2e (diff)
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/x86/kernel/entry_32.S')
-rw-r--r--arch/x86/kernel/entry_32.S6
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) \