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Remove the MUTEX_DEBUG kernel option.

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It has no counterpart among the other lock primitives and has been a
no-op for years. Mutex consistency checks are generally done whenver
INVARIANTS is enabled.
This commit is contained in:
Mark Johnston 2016-05-18 03:34:02 +00:00
parent 632da4eb89
commit be2dfd58fe
3 changed files with 0 additions and 39 deletions
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2
sys/conf/NOTES
View file

@ -298,7 +298,6 @@ options SX_NOINLINE
# performance and increase the frequency of kernel panics by
# design. If you aren't sure that you need it then you don't.
# Relies on the PREEMPTION option. DON'T TURN THIS ON.
# MUTEX_DEBUG enables various extra assertions in the mutex code.
# SLEEPQUEUE_PROFILING enables rudimentary profiling of the hash table
# used to hold active sleep queues as well as sleep wait message
# frequency.
@ -314,7 +313,6 @@ options SX_NOINLINE
# WITNESS_SKIPSPIN disables the witness checks on spin mutexes.
options PREEMPTION
options FULL_PREEMPTION
options MUTEX_DEBUG
options WITNESS
options WITNESS_KDB
options WITNESS_SKIPSPIN

1
sys/conf/options
View file

@ -590,7 +590,6 @@ MAXCPU opt_global.h
MAXMEMDOM opt_global.h
MAXPHYS opt_global.h
MCLSHIFT opt_global.h
MUTEX_DEBUG opt_global.h
MUTEX_NOINLINE opt_global.h
LOCK_PROFILING opt_global.h
LOCK_PROFILING_FAST opt_global.h

36
sys/kern/kern_mutex.c
View file

@ -844,37 +844,6 @@ __mtx_assert(const volatile uintptr_t *c, int what, const char *file, int line)
}
#endif
/*
* The MUTEX_DEBUG-enabled mtx_validate()
*
* Most of these checks have been moved off into the LO_INITIALIZED flag
* maintained by the witness code.
*/
#ifdef MUTEX_DEBUG
void mtx_validate(struct mtx *);
void
mtx_validate(struct mtx *m)
{
/*
* XXX: When kernacc() does not require Giant we can reenable this check
*/
#ifdef notyet
/*
* Can't call kernacc() from early init386(), especially when
* initializing Giant mutex, because some stuff in kernacc()
* requires Giant itself.
*/
if (!cold)
if (!kernacc((caddr_t)m, sizeof(m),
VM_PROT_READ | VM_PROT_WRITE))
panic("Can't read and write to mutex %p", m);
#endif
}
#endif
/*
* General init routine used by the MTX_SYSINIT() macro.
*/
@ -908,11 +877,6 @@ _mtx_init(volatile uintptr_t *c, const char *name, const char *type, int opts)
("%s: mtx_lock not aligned for %s: %p", __func__, name,
&m->mtx_lock));
#ifdef MUTEX_DEBUG
/* Diagnostic and error correction */
mtx_validate(m);
#endif
/* Determine lock class and lock flags. */
if (opts & MTX_SPIN)
class = &lock_class_mtx_spin;