diff options
author | Ingo Molnar <mingo@kernel.org> | 2020-08-06 10:16:38 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2020-08-06 10:16:38 +0200 |
commit | a703f3633ff1d982bc4adfe7e0921bedb1701216 (patch) | |
tree | eb85b29a0bbcb29045e197ab77e18ffc8649a722 /kernel/locking | |
parent | locking/lockdep: Fix overflow in presentation of average lock-time (diff) | |
parent | seqcount: More consistent seqprop names (diff) | |
download | linux-a703f3633ff1d982bc4adfe7e0921bedb1701216.tar.xz linux-a703f3633ff1d982bc4adfe7e0921bedb1701216.zip |
Merge branch 'WIP.locking/seqlocks' into locking/urgent
Pick up the full seqlock series PeterZ is working on.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking')
-rw-r--r-- | kernel/locking/lockdep.c | 80 |
1 files changed, 59 insertions, 21 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 29a8de4c50b9..c9ea05edce25 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -395,7 +395,7 @@ void lockdep_init_task(struct task_struct *task) static __always_inline void lockdep_recursion_finish(void) { - if (WARN_ON_ONCE(--current->lockdep_recursion)) + if (WARN_ON_ONCE((--current->lockdep_recursion) & LOCKDEP_RECURSION_MASK)) current->lockdep_recursion = 0; } @@ -2062,9 +2062,9 @@ print_bad_irq_dependency(struct task_struct *curr, pr_warn("-----------------------------------------------------\n"); pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n", curr->comm, task_pid_nr(curr), - curr->hardirq_context, hardirq_count() >> HARDIRQ_SHIFT, + lockdep_hardirq_context(), hardirq_count() >> HARDIRQ_SHIFT, curr->softirq_context, softirq_count() >> SOFTIRQ_SHIFT, - curr->hardirqs_enabled, + lockdep_hardirqs_enabled(), curr->softirqs_enabled); print_lock(next); @@ -3331,9 +3331,9 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this, pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] takes:\n", curr->comm, task_pid_nr(curr), - lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT, + lockdep_hardirq_context(), hardirq_count() >> HARDIRQ_SHIFT, lockdep_softirq_context(curr), softirq_count() >> SOFTIRQ_SHIFT, - lockdep_hardirqs_enabled(curr), + lockdep_hardirqs_enabled(), lockdep_softirqs_enabled(curr)); print_lock(this); @@ -3646,10 +3646,19 @@ static void __trace_hardirqs_on_caller(void) */ void lockdep_hardirqs_on_prepare(unsigned long ip) { - if (unlikely(!debug_locks || current->lockdep_recursion)) + if (unlikely(!debug_locks)) + return; + + /* + * NMIs do not (and cannot) track lock dependencies, nothing to do. + */ + if (unlikely(in_nmi())) return; - if (unlikely(current->hardirqs_enabled)) { + if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK)) + return; + + if (unlikely(lockdep_hardirqs_enabled())) { /* * Neither irq nor preemption are disabled here * so this is racy by nature but losing one hit @@ -3677,7 +3686,7 @@ void lockdep_hardirqs_on_prepare(unsigned long ip) * Can't allow enabling interrupts while in an interrupt handler, * that's general bad form and such. Recursion, limited stack etc.. */ - if (DEBUG_LOCKS_WARN_ON(current->hardirq_context)) + if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context())) return; current->hardirq_chain_key = current->curr_chain_key; @@ -3692,10 +3701,30 @@ void noinstr lockdep_hardirqs_on(unsigned long ip) { struct task_struct *curr = current; - if (unlikely(!debug_locks || curr->lockdep_recursion)) + if (unlikely(!debug_locks)) return; - if (curr->hardirqs_enabled) { + /* + * NMIs can happen in the middle of local_irq_{en,dis}able() where the + * tracking state and hardware state are out of sync. + * + * NMIs must save lockdep_hardirqs_enabled() to restore IRQ state from, + * and not rely on hardware state like normal interrupts. + */ + if (unlikely(in_nmi())) { + /* + * Skip: + * - recursion check, because NMI can hit lockdep; + * - hardware state check, because above; + * - chain_key check, see lockdep_hardirqs_on_prepare(). + */ + goto skip_checks; + } + + if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK)) + return; + + if (lockdep_hardirqs_enabled()) { /* * Neither irq nor preemption are disabled here * so this is racy by nature but losing one hit @@ -3720,8 +3749,9 @@ void noinstr lockdep_hardirqs_on(unsigned long ip) DEBUG_LOCKS_WARN_ON(current->hardirq_chain_key != current->curr_chain_key); +skip_checks: /* we'll do an OFF -> ON transition: */ - curr->hardirqs_enabled = 1; + this_cpu_write(hardirqs_enabled, 1); curr->hardirq_enable_ip = ip; curr->hardirq_enable_event = ++curr->irq_events; debug_atomic_inc(hardirqs_on_events); @@ -3735,7 +3765,15 @@ void noinstr lockdep_hardirqs_off(unsigned long ip) { struct task_struct *curr = current; - if (unlikely(!debug_locks || curr->lockdep_recursion)) + if (unlikely(!debug_locks)) + return; + + /* + * Matching lockdep_hardirqs_on(), allow NMIs in the middle of lockdep; + * they will restore the software state. This ensures the software + * state is consistent inside NMIs as well. + */ + if (unlikely(!in_nmi() && (current->lockdep_recursion & LOCKDEP_RECURSION_MASK))) return; /* @@ -3745,11 +3783,11 @@ void noinstr lockdep_hardirqs_off(unsigned long ip) if (DEBUG_LOCKS_WARN_ON(!irqs_disabled())) return; - if (curr->hardirqs_enabled) { + if (lockdep_hardirqs_enabled()) { /* * We have done an ON -> OFF transition: */ - curr->hardirqs_enabled = 0; + this_cpu_write(hardirqs_enabled, 0); curr->hardirq_disable_ip = ip; curr->hardirq_disable_event = ++curr->irq_events; debug_atomic_inc(hardirqs_off_events); @@ -3794,7 +3832,7 @@ void lockdep_softirqs_on(unsigned long ip) * usage bit for all held locks, if hardirqs are * enabled too: */ - if (curr->hardirqs_enabled) + if (lockdep_hardirqs_enabled()) mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ); lockdep_recursion_finish(); } @@ -3843,7 +3881,7 @@ mark_usage(struct task_struct *curr, struct held_lock *hlock, int check) */ if (!hlock->trylock) { if (hlock->read) { - if (curr->hardirq_context) + if (lockdep_hardirq_context()) if (!mark_lock(curr, hlock, LOCK_USED_IN_HARDIRQ_READ)) return 0; @@ -3852,7 +3890,7 @@ mark_usage(struct task_struct *curr, struct held_lock *hlock, int check) LOCK_USED_IN_SOFTIRQ_READ)) return 0; } else { - if (curr->hardirq_context) + if (lockdep_hardirq_context()) if (!mark_lock(curr, hlock, LOCK_USED_IN_HARDIRQ)) return 0; if (curr->softirq_context) @@ -3890,7 +3928,7 @@ lock_used: static inline unsigned int task_irq_context(struct task_struct *task) { - return LOCK_CHAIN_HARDIRQ_CONTEXT * !!task->hardirq_context + + return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context() + LOCK_CHAIN_SOFTIRQ_CONTEXT * !!task->softirq_context; } @@ -3983,7 +4021,7 @@ static inline short task_wait_context(struct task_struct *curr) * Set appropriate wait type for the context; for IRQs we have to take * into account force_irqthread as that is implied by PREEMPT_RT. */ - if (curr->hardirq_context) { + if (lockdep_hardirq_context()) { /* * Check if force_irqthreads will run us threaded. */ @@ -4826,11 +4864,11 @@ static void check_flags(unsigned long flags) return; if (irqs_disabled_flags(flags)) { - if (DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)) { + if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled())) { printk("possible reason: unannotated irqs-off.\n"); } } else { - if (DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)) { + if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled())) { printk("possible reason: unannotated irqs-on.\n"); } } |