aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorIan Campbell <ijc@hellion.org.uk>2008-01-30 13:33:27 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:33:27 +0100
commit503595010f2024b236fd2636a7318fe64c794d6c (patch)
tree661bcbb5bdd52f8340747afb9edd3683d90cdff3
parent4323838215184f5a2f081e0d17b8d60731b03164 (diff)
downloadlinux-stericsson-503595010f2024b236fd2636a7318fe64c794d6c.tar.gz
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>
-rw-r--r--arch/x86/kernel/head_32.S7
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: