From: Alexey Dobriyan <[email protected]>
It will execute rdmsr and wrmsr only on the cpu we need.
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
---
arch/i386/kernel/msr.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
Index: linux/arch/i386/kernel/msr.c
===================================================================
--- linux.orig/arch/i386/kernel/msr.c
+++ linux/arch/i386/kernel/msr.c
@@ -68,7 +68,6 @@ static inline int rdmsr_eio(u32 reg, u32
#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_bloc
{
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
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
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];
-
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