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arm64: vdso: fix clocksource mask when extracting bottom 56 bits

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The generic timer clocksource has 56 bits of precision and as such must
be masked appropriately after we have read it. The current mask
generated by a movn instruction is off by 4 bits, so we accidentally
include the top 4 bits in the final value.

This patch fixes the broken mask.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon 2012-11-30 18:34:25 +00:00 committed by Catalin Marinas
parent f2bd5d2406
commit 251db45336
1 changed files with 1 additions and 1 deletions
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arch/arm64/kernel/vdso/gettimeofday.S
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@ -223,7 +223,7 @@ ENTRY(__do_get_tspec)
/* Calculate cycle delta and convert to ns. */
sub x10, x9, x10
/* We can only guarantee 56 bits of precision. */
movn x9, #0xff0, lsl #48
movn x9, #0xff00, lsl #48
and x10, x9, x10
mul x10, x10, x14
lsr x10, x10, x15