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| author | Radim Krčmář <rkrcmar@redhat.com> | 2018-02-01 15:04:17 +0100 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2018-02-01 15:04:17 +0100 |
| commit | 7bf14c28ee776be567855bd39ed8ff795ea19f55 (patch) | |
| tree | 6113748c673e85fccc2c56c050697789c00c6bc2 /include/linux/percpu-refcount.h | |
| parent | 87cedc6be55954c6efd6eca2e694132513f65a2a (diff) | |
| parent | 5fa4ec9cb2e6679e2f828033726f758ea314b9c5 (diff) | |
Merge branch 'x86/hyperv' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Topic branch for stable KVM clockource under Hyper-V.
Thanks to Christoffer Dall for resolving the ARM conflict.
Diffstat (limited to 'include/linux/percpu-refcount.h')
| -rw-r--r-- | include/linux/percpu-refcount.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h index 6658d9ee5257..864d167a1073 100644 --- a/include/linux/percpu-refcount.h +++ b/include/linux/percpu-refcount.h @@ -139,12 +139,12 @@ static inline bool __ref_is_percpu(struct percpu_ref *ref, * when using it as a pointer, __PERCPU_REF_ATOMIC may be set in * between contaminating the pointer value, meaning that * READ_ONCE() is required when fetching it. + * + * The smp_read_barrier_depends() implied by READ_ONCE() pairs + * with smp_store_release() in __percpu_ref_switch_to_percpu(). */ percpu_ptr = READ_ONCE(ref->percpu_count_ptr); - /* paired with smp_store_release() in __percpu_ref_switch_to_percpu() */ - smp_read_barrier_depends(); - /* * Theoretically, the following could test just ATOMIC; however, * then we'd have to mask off DEAD separately as DEAD may be |