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| author | Avi Kivity <avi@qumranet.com> | 2007-10-17 18:04:38 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@inhelltoy.tec.linutronix.de> | 2007-10-17 20:16:20 +0200 |
| commit | 5f1f935ca4e385444c07164cf43dfdfe5eeee006 (patch) | |
| tree | 3693d9e1cee6b917a507bd96332c1464b96cdab1 /arch/x86/lib | |
| parent | 4a40cb1ec68d021125e37a69a0be79dc16dd41b1 (diff) | |
| download | linux-5f1f935ca4e385444c07164cf43dfdfe5eeee006.tar.gz linux-5f1f935ca4e385444c07164cf43dfdfe5eeee006.tar.bz2 linux-5f1f935ca4e385444c07164cf43dfdfe5eeee006.zip | |
i386: simplify smp_call_function_single() call sequence in msr-on-cpu
smp_call_function_single() now knows how to call the function on the
current cpu.
[ tglx: arch/x86 adaptation ]
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/msr-on-cpu.c | 62 |
1 files changed, 22 insertions, 40 deletions
diff --git a/arch/x86/lib/msr-on-cpu.c b/arch/x86/lib/msr-on-cpu.c index 7767962f25d3..57d043fa893e 100644 --- a/arch/x86/lib/msr-on-cpu.c +++ b/arch/x86/lib/msr-on-cpu.c @@ -26,27 +26,18 @@ static void __rdmsr_safe_on_cpu(void *info) static int _rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h, int safe) { int err = 0; - preempt_disable(); - if (smp_processor_id() == cpu) - if (safe) - err = rdmsr_safe(msr_no, l, h); - else - rdmsr(msr_no, *l, *h); - else { - struct msr_info rv; - - rv.msr_no = msr_no; - if (safe) { - smp_call_function_single(cpu, __rdmsr_safe_on_cpu, - &rv, 0, 1); - err = rv.err; - } else { - smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1); - } - *l = rv.l; - *h = rv.h; + struct msr_info rv; + + rv.msr_no = msr_no; + if (safe) { + smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 0, 1); + err = rv.err; + } else { + smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1); } - preempt_enable(); + *l = rv.l; + *h = rv.h; + return err; } @@ -67,27 +58,18 @@ static void __wrmsr_safe_on_cpu(void *info) static int _wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h, int safe) { int err = 0; - preempt_disable(); - if (smp_processor_id() == cpu) - if (safe) - err = wrmsr_safe(msr_no, l, h); - else - wrmsr(msr_no, l, h); - else { - struct msr_info rv; - - rv.msr_no = msr_no; - rv.l = l; - rv.h = h; - if (safe) { - smp_call_function_single(cpu, __wrmsr_safe_on_cpu, - &rv, 0, 1); - err = rv.err; - } else { - smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1); - } + struct msr_info rv; + + rv.msr_no = msr_no; + rv.l = l; + rv.h = h; + if (safe) { + smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 0, 1); + err = rv.err; + } else { + smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1); } - preempt_enable(); + return err; } |