diff options
| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2019-09-19 13:37:05 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-09-25 17:42:31 +0200 |
| commit | c172e0a3e8e65a4c6fffec5bc4d6de08d6f894f7 (patch) | |
| tree | d93685ace699942f22d6861581a44de5f46e60cc /kernel/sched/core.c | |
| parent | c6d68c1c4a4d6611fc0f8145d764226571d737ca (diff) | |
sched/membarrier: Return -ENOMEM to userspace on memory allocation failure
Remove the IPI fallback code from membarrier to deal with very
infrequent cpumask memory allocation failure. Use GFP_KERNEL rather
than GFP_NOWAIT, and relax the blocking guarantees for the expedited
membarrier system call commands, allowing it to block if waiting for
memory to be made available.
In addition, now -ENOMEM can be returned to user-space if the cpumask
memory allocation fails.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kirill Tkhai <tkhai@yandex.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190919173705.2181-8-mathieu.desnoyers@efficios.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
0 files changed, 0 insertions, 0 deletions