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s390/time: clock comparator revalidation 

Always use the S390_lowcore.clock_comparator field to revalidate
the clock comparator CPU register after a machine check. This avoids
an unnecssary external interrupt after a machine check if no timer
is pending.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2013-08-08 12:37:00 +02:00
parent 363fd4c1f1
commit b6bed093f4
1 changed files with 1 additions and 4 deletions
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5
arch/s390/kernel/nmi.c
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@ -214,10 +214,7 @@ static int notrace s390_revalidate_registers(struct mci *mci)
: "0", "cc"); : "0", "cc");
#endif #endif
/* Revalidate clock comparator register */ /* Revalidate clock comparator register */
if (S390_lowcore.clock_comparator == -1) set_clock_comparator(S390_lowcore.clock_comparator);
set_clock_comparator(S390_lowcore.mcck_clock);
else
set_clock_comparator(S390_lowcore.clock_comparator);
/* Check if old PSW is valid */ /* Check if old PSW is valid */
if (!mci->wp) if (!mci->wp)
/* /*