AcoSail/kernel_optimize_test
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[PATCH] i386: use smp_call_function_single()

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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>
This commit is contained in:
Alexey Dobriyan 2007-02-13 13:26:23 +01:00 committed by Andi Kleen
parent d958f14332
commit ad4e680fb2
1 changed files with 2 additions and 5 deletions
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7
arch/i386/kernel/cpuid.c
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@ -48,7 +48,6 @@ static struct class *cpuid_class;
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
struct cpuid_command { struct cpuid_command {
int cpu;
u32 reg; u32 reg;
u32 *data; u32 *data;
}; };
@ -57,8 +56,7 @@ static void cpuid_smp_cpuid(void *cmd_block)
{ {
struct cpuid_command *cmd = (struct cpuid_command *)cmd_block; 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]); &cmd->data[3]);
} }
@ -70,11 +68,10 @@ static inline void do_cpuid(int cpu, u32 reg, u32 * data)
if (cpu == smp_processor_id()) { if (cpu == smp_processor_id()) {
cpuid(reg, &data[0], &data[1], &data[2], &data[3]); cpuid(reg, &data[0], &data[1], &data[2], &data[3]);
} else { } else {
cmd.cpu = cpu;
cmd.reg = reg; cmd.reg = reg;
cmd.data = data; 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(); preempt_enable();
} }