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From: Alexey Dobriyan <adobriyan@openvz.org>
To: akpm@osdl.org
Cc: hpa@zytor.com, devel@openvz.org, linux-kernel@vger.kernel.org
Subject: [PATCH] msr.c: use smp_call_function_single()
Date: Wed, 17 Jan 2007 15:59:35 +0300 [thread overview]
Message-ID: <20070117125935.GB6021@localhost.sw.ru> (raw)
It will execute rdmsr and wrmsr only on the cpu we need.
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
---
arch/i386/kernel/msr.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
--- a/arch/i386/kernel/msr.c
+++ b/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];
next reply other threads:[~2007-01-17 12:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-17 12:59 Alexey Dobriyan [this message]
2007-01-18 22:53 ` H. Peter Anvin
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