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Groups > linux.kernel > #1345794
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 09/11] xtensa, rwsem: provide __down_write_killable |
| Date | 2016-02-29 14:10 +0100 |
| Message-ID | <r7vKk-3rD-39@gated-at.bofh.it> (permalink) |
| References | <r7vAD-38v-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Michal Hocko <mhocko@suse.com>
which uses the same fast path as __down_write except it falls back to
rwsem_down_write_failed_killable slow path and return -EINTR if killed.
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
arch/xtensa/include/asm/rwsem.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/xtensa/include/asm/rwsem.h b/arch/xtensa/include/asm/rwsem.h
index 593483f6e1ff..6283823b8040 100644
--- a/arch/xtensa/include/asm/rwsem.h
+++ b/arch/xtensa/include/asm/rwsem.h
@@ -59,6 +59,19 @@ static inline void __down_write(struct rw_semaphore *sem)
rwsem_down_write_failed(sem);
}
+static inline int __down_write_killable(struct rw_semaphore *sem)
+{
+ int tmp;
+
+ tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
+ (atomic_t *)(&sem->count));
+ if (tmp != RWSEM_ACTIVE_WRITE_BIAS)
+ if (IS_ERR(rwsem_down_write_failed_killable(sem)))
+ return -EINTR;
+
+ return 0;
+}
+
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
int tmp;
--
2.7.0
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[PATCH 0/11] introduce down_write_killable for rw_semaphore Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100 [PATCH 03/11] locking, rwsem: introduce basis for down_write_killable Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100 [PATCH 08/11] sparc, rwsem: provide __down_write_killable Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100 [PATCH 05/11] ia64, rwsem: provide __down_write_killable Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100 [PATCH 10/11] x86, rwsem: provide __down_write_killable Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100 [PATCH 09/11] xtensa, rwsem: provide __down_write_killable Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100 [PATCH 04/11] alpha, rwsem: provide __down_write_killable Michal Hocko <mhocko@kernel.org> - 2016-02-29 14:10 +0100
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