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authorBenjamin LaHaise <bcrl@kvack.org>2006-01-11 22:43:15 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:50 -0800
commit60917a3832547886549962ab9ee753253cf5e44c (patch)
treebf3726a5b0e238784ef6857a505fec5c16dcbee0 /include/asm-x86_64
parent6e3fbee5f11a8135109b08bfcbc05a29eb4eabe8 (diff)
[PATCH] x86_64: don't save eflags in x86-64 switch_to()
As discussed, the flags register on x86-64 is saved and restored by the assembly code which sets up struct pt_regs, so we do not need to save and restore it in the inline assembler which already informs gcc that we're clobbering the flags. This patch has been sanity booted and works okay here. Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/system.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index 1200ea2ea12..a3bca7552e1 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -20,8 +20,8 @@
#define __RESTORE(reg,offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t"
/* frame pointer must be last for get_wchan */
-#define SAVE_CONTEXT "pushfq ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
-#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popfq\n\t"
+#define SAVE_CONTEXT "pushq %%rbp ; movq %%rsi,%%rbp\n\t"
+#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp\n\t"
#define __EXTRA_CLOBBER \
,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15"