| subr_witness.c (164033) | subr_witness.c (164159) |
|---|---|
| 1/*- 2 * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. --- 68 unchanged lines hidden (view full) --- 77 * you have two threads T1 and T2 and a sleepable lock X. Suppose that T1 78 * acquires X and blocks on Giant. Then suppose that T2 acquires Giant and 79 * blocks on X. When T2 blocks on X, T2 will release Giant allowing T1 to 80 * execute. Thus, acquiring Giant both before and after a sleepable lock 81 * will not result in a lock order reversal. 82 */ 83 84#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. --- 68 unchanged lines hidden (view full) --- 77 * you have two threads T1 and T2 and a sleepable lock X. Suppose that T1 78 * acquires X and blocks on Giant. Then suppose that T2 acquires Giant and 79 * blocks on X. When T2 blocks on X, T2 will release Giant allowing T1 to 80 * execute. Thus, acquiring Giant both before and after a sleepable lock 81 * will not result in a lock order reversal. 82 */ 83 84#include <sys/cdefs.h> |
| 85__FBSDID("$FreeBSD: head/sys/kern/subr_witness.c 164033 2006-11-06 13:42:10Z rwatson $"); | 85__FBSDID("$FreeBSD: head/sys/kern/subr_witness.c 164159 2006-11-11 03:18:07Z kmacy $"); |
| 86 87#include "opt_ddb.h" 88#include "opt_witness.h" 89 90#include <sys/param.h> 91#include <sys/bus.h> 92#include <sys/kdb.h> 93#include <sys/kernel.h> --- 383 unchanged lines hidden (view full) --- 477 * We have to release Giant before initializing its witness 478 * structure so that WITNESS doesn't get confused. 479 */ 480 mtx_unlock(&Giant); 481 mtx_assert(&Giant, MA_NOTOWNED); 482 483 CTR1(KTR_WITNESS, "%s: initializing witness", __func__); 484 mtx_init(&w_mtx, "witness lock", NULL, MTX_SPIN | MTX_QUIET | | 86 87#include "opt_ddb.h" 88#include "opt_witness.h" 89 90#include <sys/param.h> 91#include <sys/bus.h> 92#include <sys/kdb.h> 93#include <sys/kernel.h> --- 383 unchanged lines hidden (view full) --- 477 * We have to release Giant before initializing its witness 478 * structure so that WITNESS doesn't get confused. 479 */ 480 mtx_unlock(&Giant); 481 mtx_assert(&Giant, MA_NOTOWNED); 482 483 CTR1(KTR_WITNESS, "%s: initializing witness", __func__); 484 mtx_init(&w_mtx, "witness lock", NULL, MTX_SPIN | MTX_QUIET | |
| 485 MTX_NOWITNESS); | 485 MTX_NOWITNESS | MTX_NOPROFILE); |
| 486 for (i = 0; i < WITNESS_COUNT; i++) 487 witness_free(&w_data[i]); 488 for (i = 0; i < WITNESS_CHILDCOUNT; i++) 489 witness_child_free(&w_childdata[i]); 490 for (i = 0; i < LOCK_CHILDCOUNT; i++) 491 witness_lock_list_free(&w_locklistdata[i]); 492 493 /* First add in all the specified order lists. */ --- 1506 unchanged lines hidden --- | 486 for (i = 0; i < WITNESS_COUNT; i++) 487 witness_free(&w_data[i]); 488 for (i = 0; i < WITNESS_CHILDCOUNT; i++) 489 witness_child_free(&w_childdata[i]); 490 for (i = 0; i < LOCK_CHILDCOUNT; i++) 491 witness_lock_list_free(&w_locklistdata[i]); 492 493 /* First add in all the specified order lists. */ --- 1506 unchanged lines hidden --- |