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locks: adjust loop limit check when waiting for readers

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The check was for the exact value, but since the counter started being
incremented by the number of readers it could have jumped over.
This commit is contained in:
Mateusz Guzik 2017-12-31 02:31:01 +00:00
parent cde25ed4cd
commit efa9f177f5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=327402
2 changed files with 3 additions and 3 deletions
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4
sys/kern/kern_rwlock.c
View File

@ -516,7 +516,7 @@ __rw_rlock_hard(struct rwlock *rw, struct thread *td, uintptr_t v
#endif
KTR_STATE0(KTR_SCHED, "thread", sched_tdname(curthread),
"running");
if (i != rowner_loops)
if (i < rowner_loops)
continue;
}
#endif
@ -995,7 +995,7 @@ __rw_wlock_hard(volatile uintptr_t *c, uintptr_t v LOCK_FILE_LINE_ARG_DEF)
#ifdef KDTRACE_HOOKS
lda.spin_cnt += rowner_loops - i;
#endif
if (i != rowner_loops)
if (i < rowner_loops)
continue;
sleep_reason = 2;
}

2
sys/kern/kern_sx.c
View File

@ -671,7 +671,7 @@ _sx_xlock_hard(struct sx *sx, uintptr_t x, int opts LOCK_FILE_LINE_ARG_DEF)
#endif
KTR_STATE0(KTR_SCHED, "thread",
sched_tdname(curthread), "running");
if (i != asx_loops)
if (i < asx_loops)
continue;
sleep_reason = 2;
}