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| author | kib <kib@FreeBSD.org> | 2016-06-23 08:27:38 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2016-06-23 08:27:38 +0000 |
| commit | 3fa8aa8e45e52358076eafe4a5f32584caad74b0 (patch) | |
| tree | a7d83ab880f933a254419397f5ea2287f6ee5df3 /sys/vm/vm_page.h | |
| parent | 113f2d399881db003b011a131ba80137a4966a4c (diff) | |
| download | FreeBSD-src-3fa8aa8e45e52358076eafe4a5f32584caad74b0.zip FreeBSD-src-3fa8aa8e45e52358076eafe4a5f32584caad74b0.tar.gz | |
Add a comment noting locking regime for vm_page_xunbusy().
Reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Approved by: re (gjb)
Diffstat (limited to 'sys/vm/vm_page.h')
| -rw-r--r-- | sys/vm/vm_page.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index 0f0b330..c915598 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -552,6 +552,7 @@ void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line); (m)); \ } while (0) +/* Note: page m's lock must not be owned by the caller. */ #define vm_page_xunbusy(m) do { \ if (!atomic_cmpset_rel_int(&(m)->busy_lock, \ VPB_SINGLE_EXCLUSIVER, VPB_UNBUSIED)) \ |
