diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-11-06 22:55:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-05 15:38:28 +0100 |
| commit | e6e00df182908f34360c3c9f2d13cc719362e9c0 (patch) | |
| tree | 92d3b927fdc9bdcf6f8639d7b65061b153fa0df5 /kernel/resource.c | |
| parent | ac7e59a0c1ae35a252b2e9946547b82be90cec36 (diff) | |
futex: Provide distinct return value when owner is exiting
commit ac31c7ff8624409ba3c4901df9237a616c187a5d upstream.
attach_to_pi_owner() returns -EAGAIN for various cases:
- Owner task is exiting
- Futex value has changed
The caller drops the held locks (hash bucket, mmap_sem) and retries the
operation. In case of the owner task exiting this can result in a live
lock.
As a preparatory step for seperating those cases, provide a distinct return
value (EBUSY) for the owner exiting case.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20191106224556.935606117@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/resource.c')
0 files changed, 0 insertions, 0 deletions