diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-07-17 20:51:23 +0400 |
|---|---|---|
| committer | Minda Chen <minda.chen@starfivetech.com> | 2023-11-06 14:24:44 +0300 |
| commit | a459f1e4aa5f5f6879a30924fc796c27a2eb2762 (patch) | |
| tree | 92664fbcf26ae9b5c2e047f9a7b14161bbecef34 /include | |
| parent | 0e97e38e96491c4818883d775395192b00008eff (diff) | |
| download | linux-a459f1e4aa5f5f6879a30924fc796c27a2eb2762.tar.xz | |
lockdep: Make it RT aware
There is not really a softirq context on PREEMPT_RT.
Softirqs on PREEMPT_RT are always invoked within the context of a threaded
interrupt handler or within ksoftirqd. The "in-softirq" context is preemptible
and is protected by a per-CPU lock to ensure mutual exclusion.
There is no difference on PREEMPT_RT between spin_lock_irq() and spin_lock()
because the former does not disable interrupts. Therefore if lock is used
in_softirq() and locked once with spin_lock_irq() then lockdep will report this
with "inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage".
Teach lockdep that we don't really do softirqs on -RT.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/irqflags.h | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h index 600c10da321a..4b140938b03e 100644 --- a/include/linux/irqflags.h +++ b/include/linux/irqflags.h @@ -71,14 +71,6 @@ do { \ do { \ __this_cpu_dec(hardirq_context); \ } while (0) -# define lockdep_softirq_enter() \ -do { \ - current->softirq_context++; \ -} while (0) -# define lockdep_softirq_exit() \ -do { \ - current->softirq_context--; \ -} while (0) # define lockdep_hrtimer_enter(__hrtimer) \ ({ \ @@ -140,6 +132,21 @@ do { \ # define lockdep_irq_work_exit(__work) do { } while (0) #endif +#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT) +# define lockdep_softirq_enter() \ +do { \ + current->softirq_context++; \ +} while (0) +# define lockdep_softirq_exit() \ +do { \ + current->softirq_context--; \ +} while (0) + +#else +# define lockdep_softirq_enter() do { } while (0) +# define lockdep_softirq_exit() do { } while (0) +#endif + #if defined(CONFIG_IRQSOFF_TRACER) || \ defined(CONFIG_PREEMPT_TRACER) extern void stop_critical_timings(void); |