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Code Issues Releases Activity

proc: use MTX_NEW flag in proc_init

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This allows us to get rid of bzero which was added specifically to make
mtx_init on p_mtx reliable.

This also fixes a potential problem where mtx_init on other mutexes
could trip over on unitialized memory and fire an assertion.

Reviewed by:	kib
This commit is contained in:
Mateusz Guzik 2015-03-21 20:25:34 +00:00
parent ffb34484ee
commit f97af9706b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=280332
1 changed files with 5 additions and 6 deletions
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11
sys/kern/kern_proc.c
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@ -225,12 +225,11 @@ proc_init(void *mem, int size, int flags)
p = (struct proc *)mem;
SDT_PROBE(proc, kernel, init, entry, p, size, flags, 0, 0);
p->p_sched = (struct p_sched *)&p[1];
bzero(&p->p_mtx, sizeof(struct mtx));
mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN);
mtx_init(&p->p_statmtx, "pstatl", NULL, MTX_SPIN);
mtx_init(&p->p_itimmtx, "pitiml", NULL, MTX_SPIN);
mtx_init(&p->p_profmtx, "pprofl", NULL, MTX_SPIN);
mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK | MTX_NEW);
mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN | MTX_NEW);
mtx_init(&p->p_statmtx, "pstatl", NULL, MTX_SPIN | MTX_NEW);
mtx_init(&p->p_itimmtx, "pitiml", NULL, MTX_SPIN | MTX_NEW);
mtx_init(&p->p_profmtx, "pprofl", NULL, MTX_SPIN | MTX_NEW);
cv_init(&p->p_pwait, "ppwait");
cv_init(&p->p_dbgwait, "dbgwait");
TAILQ_INIT(&p->p_threads); /* all threads in proc */