diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-02-01 15:12:13 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-03 23:16:16 +0100 |
| commit | aa2f795a5bc171282a79c55d0a4e55cfdcea2845 (patch) | |
| tree | ce437efd6cc90906fa30e99710478a9537c06409 /Documentation/isdn/README.HiSax | |
| parent | 26f05b30e97d3bc30a20b52719d726f062539807 (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>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/isdn/README.HiSax')
0 files changed, 0 insertions, 0 deletions