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| author | Odin Ugedal <odin@uged.al> | 2021-06-29 14:14:52 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-28 09:12:34 +0200 |
| commit | 70e95b0d4657a5b1b8e45c86bc46953c305d9ff9 (patch) | |
| tree | 09ddf4054448ef4839debad982708382e59252a3 /kernel/stop_machine.c | |
| parent | 165717ea4660a5ac5b992cf79779542b12e13aa6 (diff) | |
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 'kernel/stop_machine.c')
0 files changed, 0 insertions, 0 deletions