https://github.com/torvalds/linux
Revision 09edea4f8fdeb4e292b80d493296070f5ec64e6e authored by Nathan Lynch on 10 August 2015, 16:36:06 UTC, committed by Russell King on 11 August 2015, 12:42:44 UTC
Since 906c55579a63 ("timekeeping: Copy the shadow-timekeeper over the
real timekeeper last") it has become possible on ARM to:
- Obtain a CLOCK_MONOTONIC_COARSE or CLOCK_REALTIME_COARSE timestamp
via syscall.
- Subsequently obtain a timestamp for the same clock ID via VDSO which
predates the first timestamp (by one jiffy).
This is because ARM's update_vsyscall is deriving the coarse time
using the __current_kernel_time interface, when it should really be
using the timekeeper object provided to it by the timekeeping core.
It happened to work before only because __current_kernel_time would
access the same timekeeper object which had been passed to
update_vsyscall. This is no longer the case.
Cc: stable@vger.kernel.org
Fixes: 906c55579a63 ("timekeeping: Copy the shadow-timekeeper over the real timekeeper last")
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1 parent e83dd37
Tip revision: 09edea4f8fdeb4e292b80d493296070f5ec64e6e authored by Nathan Lynch on 10 August 2015, 16:36:06 UTC
ARM: 8410/1: VDSO: fix coarse clock monotonicity regression
ARM: 8410/1: VDSO: fix coarse clock monotonicity regression
Tip revision: 09edea4
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