From 60917a3832547886549962ab9ee753253cf5e44c Mon Sep 17 00:00:00 2001 From: Benjamin LaHaise Date: Wed, 11 Jan 2006 22:43:15 +0100 Subject: [PATCH] [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 Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/system.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h index 1200ea2..a3bca75 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" -- 2.7.4