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| author | Mitchell Horne <mhorne@FreeBSD.org> | 2021-04-08 17:41:19 +0000 |
|---|---|---|
| committer | Mitchell Horne <mhorne@FreeBSD.org> | 2021-04-12 14:42:21 +0000 |
| commit | 2816bd8442bc323d50434d0e64cb4b7c10a195e8 (patch) | |
| tree | 21c7d167b8595922cb8a500a322fee328a031a7e | |
| parent | 034669e856211cbc55d6ac7119629701d182647d (diff) | |
| download | src-2816bd8442bc323d50434d0e64cb4b7c10a195e8.tar.gz src-2816bd8442bc323d50434d0e64cb4b7c10a195e8.zip | |
rmlock(9): add an RM_DUPOK flag
Allows for duplicate locks to be acquired without witness complaining.
Similar flags exists already for rwlock(9) and sx(9).
Reviewed by: markj
MFC after: 3 days
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
NetApp PR: 52
Differential Revision: https://reviews.freebsd.org/D29683n
| -rw-r--r-- | share/man/man9/rmlock.9 | 5 | ||||
| -rw-r--r-- | sys/kern/kern_rmlock.c | 2 | ||||
| -rw-r--r-- | sys/sys/rmlock.h | 1 |
3 files changed, 7 insertions, 1 deletions
diff --git a/share/man/man9/rmlock.9 b/share/man/man9/rmlock.9 index 53de7c73b79a..6d128f986968 100644 --- a/share/man/man9/rmlock.9 +++ b/share/man/man9/rmlock.9 @@ -26,7 +26,7 @@ .\" $FreeBSD$ .\" .\" Based on rwlock.9 man page -.Dd December 27, 2019 +.Dd April 12, 2021 .Dt RMLOCK 9 .Os .Sh NAME @@ -186,6 +186,9 @@ will assert that the has not been initialized multiple times without intervening calls to .Fn rm_destroy unless this option is specified. +.It Dv RM_DUPOK +.Xr witness 4 +should not log messages about duplicate locks being acquired. .El .It Fn rm_rlock "struct rmlock *rm" "struct rm_priotracker* tracker" Lock diff --git a/sys/kern/kern_rmlock.c b/sys/kern/kern_rmlock.c index f661e209b633..7230a00e357b 100644 --- a/sys/kern/kern_rmlock.c +++ b/sys/kern/kern_rmlock.c @@ -289,6 +289,8 @@ rm_init_flags(struct rmlock *rm, const char *name, int opts) liflags |= LO_RECURSABLE; if (opts & RM_NEW) liflags |= LO_NEW; + if (opts & RM_DUPOK) + liflags |= LO_DUPOK; rm->rm_writecpus = all_cpus; LIST_INIT(&rm->rm_activeReaders); if (opts & RM_SLEEPABLE) { diff --git a/sys/sys/rmlock.h b/sys/sys/rmlock.h index 3e4db5d853c6..5aaf8f039026 100644 --- a/sys/sys/rmlock.h +++ b/sys/sys/rmlock.h @@ -48,6 +48,7 @@ #define RM_RECURSE 0x00000002 #define RM_SLEEPABLE 0x00000004 #define RM_NEW 0x00000008 +#define RM_DUPOK 0x00000010 void rm_init(struct rmlock *rm, const char *name); void rm_init_flags(struct rmlock *rm, const char *name, int opts); |