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Subject[PATCH x86 for review II] [24/39] i386: use smp_call_function_single()
Date

From: Alexey Dobriyan <adobriyan@openvz.org>
It will execure cpuid only on the cpu we need.

Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: Andi Kleen <ak@suse.de>

---
arch/i386/kernel/cpuid.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
Index: linux/arch/i386/kernel/cpuid.c
===================================================================
--- linux.orig/arch/i386/kernel/cpuid.c
+++ linux/arch/i386/kernel/cpuid.c
@@ -48,7 +48,6 @@ static struct class *cpuid_class;
#ifdef CONFIG_SMP

struct cpuid_command {
- int cpu;
u32 reg;
u32 *data;
};
@@ -57,8 +56,7 @@ static void cpuid_smp_cpuid(void *cmd_bl
{
struct cpuid_command *cmd = (struct cpuid_command *)cmd_block;

- if (cmd->cpu == smp_processor_id())
- cpuid(cmd->reg, &cmd->data[0], &cmd->data[1], &cmd->data[2],
+ cpuid(cmd->reg, &cmd->data[0], &cmd->data[1], &cmd->data[2],
&cmd->data[3]);
}

@@ -70,11 +68,10 @@ static inline void do_cpuid(int cpu, u32
if (cpu == smp_processor_id()) {
cpuid(reg, &data[0], &data[1], &data[2], &data[3]);
} else {
- cmd.cpu = cpu;
cmd.reg = reg;
cmd.data = data;

- smp_call_function(cpuid_smp_cpuid, &cmd, 1, 1);
+ smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1, 1);
}
preempt_enable();
}
-
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