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author | Odin Ugedal <odin@uged.al> | 2021-06-29 14:14:52 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-28 11:12:15 +0200 |
commit | c1111029582e5a37509409b7ab5124c007f6b1f2 (patch) | |
tree | 9168c9d44617b42542329cac2a37274370dffa73 /include | |
parent | 44651522941c623e20882b3b443f23f77de1ea8b (diff) | |
download | linux-stable-c1111029582e5a37509409b7ab5124c007f6b1f2.tar.gz linux-stable-c1111029582e5a37509409b7ab5124c007f6b1f2.tar.bz2 linux-stable-c1111029582e5a37509409b7ab5124c007f6b1f2.zip |
sched/fair: Fix CFS bandwidth hrtimer expiry type
[ Upstream commit 72d0ad7cb5bad265adb2014dbe46c4ccb11afaba ]
The time remaining until expiry of the refresh_timer can be negative.
Casting the type to an unsigned 64-bit value will cause integer
underflow, making the runtime_refresh_within return false instead of
true. These situations are rare, but they do happen.
This does not cause user-facing issues or errors; other than
possibly unthrottling cfs_rq's using runtime from the previous period(s),
making the CFS bandwidth enforcement less strict in those (special)
situations.
Signed-off-by: Odin Ugedal <odin@uged.al>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ben Segall <bsegall@google.com>
Link: https://lore.kernel.org/r/20210629121452.18429-1-odin@uged.al
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions