Messages in this thread Patch in this message | | | From | (Eric W. Biederman) | Subject | [PATCH 02/12] i386 head.S: Remove unnecessary use of %ebx as the boot cpu flag | Date | Mon, 30 Apr 2007 09:49:31 -0600 |
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Currently in head.S there are two ways we test to see if we are the boot cpu. By looking at %ebx and by looking at the static variable ready. When changing things around I have found that it gets tricky to preserve %ebx. So this patch just switches head.S over to the more reliable test of always using ready.
Hopefully later we can kill these tests entirely.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> --- arch/i386/kernel/head.S | 7 +------ 1 files changed, 1 insertions(+), 6 deletions(-)
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S index 9b10af6..aa9e28e 100644 --- a/arch/i386/kernel/head.S +++ b/arch/i386/kernel/head.S @@ -157,7 +157,6 @@ page_pde_offset = (__PAGE_OFFSET >> 20); jb 10b movl %edi,(init_pg_tables_end - __PAGE_OFFSET) - xorl %ebx,%ebx /* This is the boot CPU (BSP) */ jmp 3f /* * Non-boot CPU entry point; entered from trampoline.S @@ -228,10 +227,6 @@ ENTRY(startup_32_smp) wrmsr 6: - /* This is a secondary processor (AP) */ - xorl %ebx,%ebx - incl %ebx - #endif /* CONFIG_SMP */ 3: @@ -257,7 +252,7 @@ ENTRY(startup_32_smp) popfl #ifdef CONFIG_SMP - andl %ebx,%ebx + cmpb $0, ready jz 1f /* Initial CPU cleans BSS */ jmp checkCPUtype 1: -- 1.5.1.1.181.g2de0 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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