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Commit ad4e680f authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Andi Kleen
Browse files

[PATCH] i386: use smp_call_function_single() 



It will execure cpuid only on the cpu we need.

Signed-off-by: default avatarAlexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent d958f143

arch/i386/kernel/cpuid.c

+2 −5
Original line number Diff line number Diff line
@@ -48,7 +48,6 @@ static struct class *cpuid_class; 
#ifdef CONFIG_SMP



struct cpuid_command {

	int cpu;

	u32 reg;

	u32 *data;

};
@@ -57,7 +56,6 @@ static void cpuid_smp_cpuid(void *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],

		      &cmd->data[3]);

}
@@ -70,11 +68,10 @@ static inline void do_cpuid(int cpu, u32 reg, u32 * data) 
	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();

}