Author: mjg Date: Wed Feb 15 23:33:14 2017 New Revision: 313784 URL: https://svnweb.freebsd.org/changeset/base/313784
Log: rwlock: tidy up r313392 While a new bit was added and thread alignment got shifted to accomodate it, RW_READERS_SHIFT was not modified accordingly and clashed with the new flag. This was surprisingly harmless. If the lock was taken for writing, other flags were tested. If the lock was taken for reading, it would correctly work for readers > 1 and this was the only relevant test performed. Modified: head/sys/sys/rwlock.h Modified: head/sys/sys/rwlock.h ============================================================================== --- head/sys/sys/rwlock.h Wed Feb 15 23:04:25 2017 (r313783) +++ head/sys/sys/rwlock.h Wed Feb 15 23:33:14 2017 (r313784) @@ -65,7 +65,7 @@ #define RW_LOCK_WAITERS (RW_LOCK_READ_WAITERS | RW_LOCK_WRITE_WAITERS) #define RW_OWNER(x) ((x) & ~RW_LOCK_FLAGMASK) -#define RW_READERS_SHIFT 4 +#define RW_READERS_SHIFT 5 #define RW_READERS(x) (RW_OWNER((x)) >> RW_READERS_SHIFT) #define RW_READERS_LOCK(x) ((x) << RW_READERS_SHIFT | RW_LOCK_READ) #define RW_ONE_READER (1 << RW_READERS_SHIFT) _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
