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authorWill Deacon <[email protected]>2017-06-08 16:44:22 -0700
committerThomas Gleixner <[email protected]>2017-06-20 10:41:51 +0200
commitdbb236c1ceb697a559e0694ac4c9e7b9131d0b16 (patch)
tree171280b1a599f77933532dda1695f07074b9342f /drivers/fpga
parent3d88d56c5873f6eebe23e05c3da701960146b801 (diff)
arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW
Recently vDSO support for CLOCK_MONOTONIC_RAW was added in 49eea433b326 ("arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO"). Noticing that the core timekeeping code never set tkr_raw.xtime_nsec, the vDSO implementation didn't bother exposing it via the data page and instead took the unshifted tk->raw_time.tv_nsec value which was then immediately shifted left in the vDSO code. Unfortunately, by accellerating the MONOTONIC_RAW clockid, it uncovered potential 1ns time inconsistencies caused by the timekeeping core not handing sub-ns resolution. Now that the core code has been fixed and is actually setting tkr_raw.xtime_nsec, we need to take that into account in the vDSO by adding it to the shifted raw_time value, in order to fix the user-visible inconsistency. Rather than do that at each use (and expand the data page in the process), instead perform the shift/addition operation when populating the data page and remove the shift from the vDSO code entirely. [jstultz: minor whitespace tweak, tried to improve commit message to make it more clear this fixes a regression] Reported-by: John Stultz <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: John Stultz <[email protected]> Tested-by: Daniel Mentz <[email protected]> Acked-by: Kevin Brodsky <[email protected]> Cc: Prarit Bhargava <[email protected]> Cc: Richard Cochran <[email protected]> Cc: Stephen Boyd <[email protected]> Cc: "stable #4 . 8+" <[email protected]> Cc: Miroslav Lichvar <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]>
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