arm64: vdso: defer shifting of nanosecond component of timespec

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Shifting the nanosecond component of the computed timespec early can
lead to sub-ns inaccuracies when using the truncated value as input to
further arithmetic for things like conversions to monotonic time.

This patch defers the timespec shifting until after the final value has
been computed.

Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Will Deacon 2012-11-29 22:33:29 +00:00 • committed by Catalin Marinas

parent d91fb5c267

commit 45a7905fc4

2 changed files with 7 additions and 3 deletions

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2

arch/arm64/kernel/vdso.c

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8

arch/arm64/kernel/vdso/gettimeofday.S

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