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| author | Ian Campbell <ijc@hellion.org.uk> | 2008-01-30 15:33:27 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 15:33:27 +0300 |
| commit | 503595010f2024b236fd2636a7318fe64c794d6c (patch) | |
| tree | 661bcbb5bdd52f8340747afb9edd3683d90cdff3 /arch | |
| parent | 4323838215184f5a2f081e0d17b8d60731b03164 (diff) | |
| download | linux-503595010f2024b236fd2636a7318fe64c794d6c.tar.xz | |
x86_32: remove unnecessary use of %ebx as the boot cpu flag
Currently in head_32.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>
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Mika Penttilä <mika.penttila@kolumbus.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/head_32.S | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index f409fe2a52e4..7b9b2566b7a8 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -199,7 +199,6 @@ default_entry: addl $0x67, %eax /* 0x67 == _PAGE_TABLE */ movl %eax, 4092(%edx) - xorl %ebx,%ebx /* This is the boot CPU (BSP) */ jmp 3f /* * Non-boot CPU entry point; entered from trampoline.S @@ -268,10 +267,6 @@ ENTRY(startup_32_smp) wrmsr 6: - /* This is a secondary processor (AP) */ - xorl %ebx,%ebx - incl %ebx - #endif /* CONFIG_SMP */ 3: @@ -297,7 +292,7 @@ ENTRY(startup_32_smp) popfl #ifdef CONFIG_SMP - andl %ebx,%ebx + cmpb $0, ready jz 1f /* Initial CPU cleans BSS */ jmp checkCPUtype 1: |