| subr_witness.c (227588) | subr_witness.c (228424) |
|---|---|
| 1/*- 2 * Copyright (c) 2008 Isilon Systems, Inc. 3 * Copyright (c) 2008 Ilya Maykov <ivmaykov@gmail.com> 4 * Copyright (c) 1998 Berkeley Software Design, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions --- 71 unchanged lines hidden (view full) --- 80 * you have two threads T1 and T2 and a sleepable lock X. Suppose that T1 81 * acquires X and blocks on Giant. Then suppose that T2 acquires Giant and 82 * blocks on X. When T2 blocks on X, T2 will release Giant allowing T1 to 83 * execute. Thus, acquiring Giant both before and after a sleepable lock 84 * will not result in a lock order reversal. 85 */ 86 87#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 2008 Isilon Systems, Inc. 3 * Copyright (c) 2008 Ilya Maykov <ivmaykov@gmail.com> 4 * Copyright (c) 1998 Berkeley Software Design, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions --- 71 unchanged lines hidden (view full) --- 80 * you have two threads T1 and T2 and a sleepable lock X. Suppose that T1 81 * acquires X and blocks on Giant. Then suppose that T2 acquires Giant and 82 * blocks on X. When T2 blocks on X, T2 will release Giant allowing T1 to 83 * execute. Thus, acquiring Giant both before and after a sleepable lock 84 * will not result in a lock order reversal. 85 */ 86 87#include <sys/cdefs.h> |
| 88__FBSDID("$FreeBSD: head/sys/kern/subr_witness.c 227588 2011-11-16 21:51:17Z pjd $"); | 88__FBSDID("$FreeBSD: head/sys/kern/subr_witness.c 228424 2011-12-11 21:02:01Z avg $"); |
| 89 90#include "opt_ddb.h" 91#include "opt_hwpmc_hooks.h" 92#include "opt_stack.h" 93#include "opt_witness.h" 94 95#include <sys/param.h> 96#include <sys/bus.h> --- 2060 unchanged lines hidden (view full) --- 2157 2158void 2159witness_save(struct lock_object *lock, const char **filep, int *linep) 2160{ 2161 struct lock_list_entry *lock_list; 2162 struct lock_instance *instance; 2163 struct lock_class *class; 2164 | 89 90#include "opt_ddb.h" 91#include "opt_hwpmc_hooks.h" 92#include "opt_stack.h" 93#include "opt_witness.h" 94 95#include <sys/param.h> 96#include <sys/bus.h> --- 2060 unchanged lines hidden (view full) --- 2157 2158void 2159witness_save(struct lock_object *lock, const char **filep, int *linep) 2160{ 2161 struct lock_list_entry *lock_list; 2162 struct lock_instance *instance; 2163 struct lock_class *class; 2164 |
| 2165 /* 2166 * This function is used independently in locking code to deal with 2167 * Giant, SCHEDULER_STOPPED() check can be removed here after Giant 2168 * is gone. 2169 */ 2170 if (SCHEDULER_STOPPED()) 2171 return; |
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| 2165 KASSERT(witness_cold == 0, ("%s: witness_cold", __func__)); 2166 if (lock->lo_witness == NULL || witness_watch == -1 || panicstr != NULL) 2167 return; 2168 class = LOCK_CLASS(lock); 2169 if (class->lc_flags & LC_SLEEPLOCK) 2170 lock_list = curthread->td_sleeplocks; 2171 else { 2172 if (witness_skipspin) --- 10 unchanged lines hidden (view full) --- 2183 2184void 2185witness_restore(struct lock_object *lock, const char *file, int line) 2186{ 2187 struct lock_list_entry *lock_list; 2188 struct lock_instance *instance; 2189 struct lock_class *class; 2190 | 2172 KASSERT(witness_cold == 0, ("%s: witness_cold", __func__)); 2173 if (lock->lo_witness == NULL || witness_watch == -1 || panicstr != NULL) 2174 return; 2175 class = LOCK_CLASS(lock); 2176 if (class->lc_flags & LC_SLEEPLOCK) 2177 lock_list = curthread->td_sleeplocks; 2178 else { 2179 if (witness_skipspin) --- 10 unchanged lines hidden (view full) --- 2190 2191void 2192witness_restore(struct lock_object *lock, const char *file, int line) 2193{ 2194 struct lock_list_entry *lock_list; 2195 struct lock_instance *instance; 2196 struct lock_class *class; 2197 |
| 2198 /* 2199 * This function is used independently in locking code to deal with 2200 * Giant, SCHEDULER_STOPPED() check can be removed here after Giant 2201 * is gone. 2202 */ 2203 if (SCHEDULER_STOPPED()) 2204 return; |
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| 2191 KASSERT(witness_cold == 0, ("%s: witness_cold", __func__)); 2192 if (lock->lo_witness == NULL || witness_watch == -1 || panicstr != NULL) 2193 return; 2194 class = LOCK_CLASS(lock); 2195 if (class->lc_flags & LC_SLEEPLOCK) 2196 lock_list = curthread->td_sleeplocks; 2197 else { 2198 if (witness_skipspin) --- 628 unchanged lines hidden --- | 2205 KASSERT(witness_cold == 0, ("%s: witness_cold", __func__)); 2206 if (lock->lo_witness == NULL || witness_watch == -1 || panicstr != NULL) 2207 return; 2208 class = LOCK_CLASS(lock); 2209 if (class->lc_flags & LC_SLEEPLOCK) 2210 lock_list = curthread->td_sleeplocks; 2211 else { 2212 if (witness_skipspin) --- 628 unchanged lines hidden --- |