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[PATCH] i386: use smp_call_function_single()

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It will execute rdmsr and wrmsr 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 edf8dd36b5
commit d958f14332
1 changed files with 4 additions and 9 deletions
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13
arch/i386/kernel/msr.c
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@ -68,7 +68,6 @@ static inline int rdmsr_eio(u32 reg, u32 *eax, u32 *edx)
#ifdef CONFIG_SMP
struct msr_command {
int cpu;
int err;
u32 reg;
u32 data[2];
@ -78,16 +77,14 @@ static void msr_smp_wrmsr(void *cmd_block)
{
struct msr_command *cmd = (struct msr_command *)cmd_block;
if (cmd->cpu == smp_processor_id())
cmd->err = wrmsr_eio(cmd->reg, cmd->data[0], cmd->data[1]);
cmd->err = wrmsr_eio(cmd->reg, cmd->data[0], cmd->data[1]);
}
static void msr_smp_rdmsr(void *cmd_block)
{
struct msr_command *cmd = (struct msr_command *)cmd_block;
if (cmd->cpu == smp_processor_id())
cmd->err = rdmsr_eio(cmd->reg, &cmd->data[0], &cmd->data[1]);
cmd->err = rdmsr_eio(cmd->reg, &cmd->data[0], &cmd->data[1]);
}
static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx)
@ -99,12 +96,11 @@ static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx)
if (cpu == smp_processor_id()) {
ret = wrmsr_eio(reg, eax, edx);
} else {
cmd.cpu = cpu;
cmd.reg = reg;
cmd.data[0] = eax;
cmd.data[1] = edx;
smp_call_function(msr_smp_wrmsr, &cmd, 1, 1);
smp_call_function_single(cpu, msr_smp_wrmsr, &cmd, 1, 1);
ret = cmd.err;
}
preempt_enable();
@ -120,10 +116,9 @@ static inline int do_rdmsr(int cpu, u32 reg, u32 * eax, u32 * edx)
if (cpu == smp_processor_id()) {
ret = rdmsr_eio(reg, eax, edx);
} else {
cmd.cpu = cpu;
cmd.reg = reg;
smp_call_function(msr_smp_rdmsr, &cmd, 1, 1);
smp_call_function_single(cpu, msr_smp_rdmsr, &cmd, 1, 1);
*eax = cmd.data[0];
*edx = cmd.data[1];