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yaml
---
r: 110367
b: refs/heads/master
c: bdd3146
h: refs/heads/master
i:
  110365: 1b5d1a6
  110363: d2abe59
  110359: 43ff18f
  110351: ba14c22
  110335: 8002d46
v: v3
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H. Peter Anvin committed Aug 26, 2008
1 parent 3c176c2 commit 929a38c
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Showing 2 changed files with 37 additions and 43 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 94d4ac2f4a58c6e37876827c6688c61cef21290c
refs/heads/master: bdd314616f7218e325aa9637a46159ecba44cfeb
78 changes: 36 additions & 42 deletions trunk/arch/x86/lib/msr-on-cpu.c
Original file line number Diff line number Diff line change
Expand Up @@ -16,37 +16,46 @@ static void __rdmsr_on_cpu(void *info)
rdmsr(rv->msr_no, rv->l, rv->h);
}

static void __rdmsr_safe_on_cpu(void *info)
static void __wrmsr_on_cpu(void *info)
{
struct msr_info *rv = info;

rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
wrmsr(rv->msr_no, rv->l, rv->h);
}

static int _rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h, int safe)
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
int err = 0;
int err;
struct msr_info rv;

rv.msr_no = msr_no;
if (safe) {
err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu,
&rv, 1);
err = err ? err : rv.err;
} else {
err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
}
err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
*l = rv.l;
*h = rv.h;

return err;
}

static void __wrmsr_on_cpu(void *info)
int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
int err;
struct msr_info rv;

rv.msr_no = msr_no;
rv.l = l;
rv.h = h;
err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);

return err;
}

/* These "safe" variants are slower and should be used when the target MSR
may not actually exist. */
static void __rdmsr_safe_on_cpu(void *info)
{
struct msr_info *rv = info;

wrmsr(rv->msr_no, rv->l, rv->h);
rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
}

static void __wrmsr_safe_on_cpu(void *info)
Expand All @@ -56,45 +65,30 @@ static void __wrmsr_safe_on_cpu(void *info)
rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
}

static int _wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h, int safe)
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
int err = 0;
int err;
struct msr_info rv;

rv.msr_no = msr_no;
rv.l = l;
rv.h = h;
if (safe) {
err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu,
&rv, 1);
err = err ? err : rv.err;
} else {
err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
}

return err;
}
err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
*l = rv.l;
*h = rv.h;

int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
return _wrmsr_on_cpu(cpu, msr_no, l, h, 0);
return err ? err : rv.err;
}

int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
return _rdmsr_on_cpu(cpu, msr_no, l, h, 0);
}

/* These "safe" variants are slower and should be used when the target MSR
may not actually exist. */
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
return _wrmsr_on_cpu(cpu, msr_no, l, h, 1);
}
int err;
struct msr_info rv;

int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
return _rdmsr_on_cpu(cpu, msr_no, l, h, 1);
rv.msr_no = msr_no;
rv.l = l;
rv.h = h;
err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);

return err ? err : rv.err;
}

EXPORT_SYMBOL(rdmsr_on_cpu);
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