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[POWERPC] Depend on ->initialized in calc_steal_time

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If CPU_FTR_PURR is not set, we will never set cpu_purr_data->initialized.
Checking via __get_cpu_var on 64 bit avoids one dependent load compared
to cpu_has_feature in the not-present case, and is always required when
it is present.  The code is under CONFIG_VIRT_CPU_ACCOUNTING so 32 bit
will not be affected.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Milton Miller 2007-12-14 15:52:19 +11:00 committed by Paul Mackerras
parent 6e6b44e822
commit db3801a858
1 changed files with 1 additions and 3 deletions
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4
arch/powerpc/kernel/time.c
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@ -329,11 +329,9 @@ void calculate_steal_time(void)
s64 stolen;
struct cpu_purr_data *pme;
if (!cpu_has_feature(CPU_FTR_PURR))
return;
pme = &__get_cpu_var(cpu_purr_data);
if (!pme->initialized)
return; /* this can happen in early boot */
return; /* !CPU_FTR_PURR or early in early boot */
tb = mftb();
purr = mfspr(SPRN_PURR);
stolen = (tb - pme->tb) - (purr - pme->purr);