diff options
Diffstat (limited to 'usr/src/uts/common/os/mutex.c')
| -rw-r--r-- | usr/src/uts/common/os/mutex.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/usr/src/uts/common/os/mutex.c b/usr/src/uts/common/os/mutex.c index 762ec2c184..873b91f6f4 100644 --- a/usr/src/uts/common/os/mutex.c +++ b/usr/src/uts/common/os/mutex.c @@ -577,7 +577,39 @@ mutex_init(kmutex_t *mp, char *name, kmutex_type_t type, void *ibc) LOCK_INIT_HELD(&lp->m_spin.m_dummylock); lp->m_spin.m_minspl = (int)(intptr_t)ibc; } else { +#ifdef MUTEX_ALIGN + static int misalign_cnt = 0; + + if (((uintptr_t)lp & (uintptr_t)(MUTEX_ALIGN - 1)) && + (misalign_cnt < MUTEX_ALIGN_WARNINGS)) { + /* + * The mutex is not aligned and may cross a cache line. + * This is not supported and may cause a panic. + * Show a warning that the mutex is not aligned + * and attempt to identify the origin. + * Unaligned mutexes are not (supposed to be) + * possible on SPARC. + */ + char *funcname; + ulong_t offset = 0; + + funcname = modgetsymname((uintptr_t)caller(), &offset); + cmn_err(CE_WARN, "mutex_init: %p is not %d byte " + "aligned; caller %s+%lx in module %s. " + "This is unsupported and may cause a panic. " + "Please report this to the kernel module supplier.", + lp, MUTEX_ALIGN, + funcname ? funcname : "unknown", offset, + mod_containing_pc(caller())); + misalign_cnt++; + if (misalign_cnt >= MUTEX_ALIGN_WARNINGS) { + cmn_err(CE_WARN, "mutex_init: further unaligned" + " mutex warnings will be suppressed."); + } + } +#endif /* MUTEX_ALIGN */ ASSERT(type != MUTEX_SPIN); + MUTEX_SET_TYPE(lp, MUTEX_ADAPTIVE); MUTEX_CLEAR_LOCK_AND_WAITERS(lp); } |