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authorGeorge Anzinger <george@mvista.com>2005-07-28 21:16:16 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-28 21:46:05 -0700
commit78fa74a23b16bdb0d944272b696915c4e0bb3ee1 (patch)
tree5f0d83021afeb7adffce9b41557e1d2e3c8c08bd /kernel/kprobes.c
parenta2d76bd8fa29f9b6dbf3ee8f6bc7bdda21bc5ce8 (diff)
[PATCH] posix timers: fix normalization problem
(We found this (after a customer complained) and it is in the kernel.org kernel. Seems that for CLOCK_MONOTONIC absolute timers and clock_nanosleep calls both the request time and wall_to_monotonic are subtracted prior to the normalize resulting in an overflow in the existing normalize test. This causes the result to be shifted ~4 seconds ahead instead of ~2 seconds back in time.) The normalize code in posix-timers.c fails when the tv_nsec member is ~1.2 seconds negative. This can happen on absolute timers (and clock_nanosleeps) requested on CLOCK_MONOTONIC (both the request time and wall_to_monotonic are subtracted resulting in the possibility of a number close to -2 seconds.) This fix uses the set_normalized_timespec() (which does not have an overflow problem) to fix the problem and as a side effect makes the code cleaner. Signed-off-by: George Anzinger <george@mvista.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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