Zachary Amsden wrote:
On Mon, 2007-11-26 at 00:38 -0800, Yinghai Lu wrote:
[PATCH] x86_64: not set boot cpu in cpu_online_map at smp_prepare_boot_cpu
in init/main.c boot_cpu_init() does that before
Signed-off-by: Yinghai Lu <[email protected]>
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 500670c..966d124 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -912,7 +912,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
void __init smp_prepare_boot_cpu(void)
{
int me = smp_processor_id();
- cpu_set(me, cpu_online_map);
+ /* already set me in cpu_online_map in boot_cpu_init() */
cpu_set(me, cpu_callout_map);
per_cpu(cpu_state, me) = CPU_ONLINE;
}
This ordering can be tricky wrt CPU hotplug. Are you sure you are not
breaking CPU hotplug? AFAIK, x86_64 has that right and the 32-bit code
had it wrong.
CPU hot plug path will call smp_prepare_boot_cpu?
it is using __init instead of __cpuinit?
YH
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