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powerpc: Add cputime_to_nsecs()

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Generic code has a wrapper to implement cputime_to_nsecs() on top of
cputime_to_usecs() but we can easily return the full nanosecond
resolution directly.

Signed-off-by: Anton Blanchard <anton@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200713083601.1103978-1-anton@ozlabs.org
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Anton Blanchard 2020-07-13 18:36:01 +10:00 committed by Michael Ellerman
parent e4208f1399
commit ade7667a98
1 changed files with 2 additions and 0 deletions
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arch/powerpc/include/asm/cputime.h
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@ -36,6 +36,8 @@ static inline unsigned long cputime_to_usecs(const cputime_t ct)
return mulhdu((__force u64) ct, __cputime_usec_factor);
}
#define cputime_to_nsecs(cputime) tb_to_ns((__force u64)cputime)
/*
* PPC64 uses PACA which is task independent for storing accounting data while
* PPC32 uses struct thread_info, therefore at task switch the accounting data