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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-15 02:17:18 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-15 02:17:18 +0300
commita1240cf74e8228f7c80d44af17914c0ffc5633fb (patch)
treeab8c5841940f9d20e6ffb6c91301a4146b63fdb8 /include
parent1d039859330b874d48080885eb31f4f129c246f1 (diff)
parent7d9ab9b6adffd9c474c1274acb5f6208f9a09cf3 (diff)
downloadlinux-a1240cf74e8228f7c80d44af17914c0ffc5633fb.tar.xz
Merge branch 'for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
Pull percpu updates from Dennis Zhou: "This includes changes to let percpu_ref release the backing percpu memory earlier after it has been switched to atomic in cases where the percpu ref is not revived. This will help recycle percpu memory earlier in cases where the refcounts are pinned for prolonged periods of time" * 'for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu: percpu_ref: release percpu memory early without PERCPU_REF_ALLOW_REINIT md: initialize percpu refcounters using PERCU_REF_ALLOW_REINIT io_uring: initialize percpu refcounters using PERCU_REF_ALLOW_REINIT percpu_ref: introduce PERCPU_REF_ALLOW_REINIT flag
Diffstat (limited to 'include')
-rw-r--r--include/linux/percpu-refcount.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index b297cd1cd4f1..7aef0abc194a 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -75,14 +75,21 @@ enum {
* operation using percpu_ref_switch_to_percpu(). If initialized
* with this flag, the ref will stay in atomic mode until
* percpu_ref_switch_to_percpu() is invoked on it.
+ * Implies ALLOW_REINIT.
*/
PERCPU_REF_INIT_ATOMIC = 1 << 0,
/*
* Start dead w/ ref == 0 in atomic mode. Must be revived with
- * percpu_ref_reinit() before used. Implies INIT_ATOMIC.
+ * percpu_ref_reinit() before used. Implies INIT_ATOMIC and
+ * ALLOW_REINIT.
*/
PERCPU_REF_INIT_DEAD = 1 << 1,
+
+ /*
+ * Allow switching from atomic mode to percpu mode.
+ */
+ PERCPU_REF_ALLOW_REINIT = 1 << 2,
};
struct percpu_ref {
@@ -95,6 +102,7 @@ struct percpu_ref {
percpu_ref_func_t *release;
percpu_ref_func_t *confirm_switch;
bool force_atomic:1;
+ bool allow_reinit:1;
struct rcu_head rcu;
};