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| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-03-09 09:55:53 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-03-17 16:34:08 +0100 |
| commit | 728b478d2d358480b333b42d0e10e0fecb20114c (patch) | |
| tree | 2f1a1bd80bd1c0a018bb881bab907c476b2c1e28 /include/linux/preempt.h | |
| parent | tasklets: Switch tasklet_disable() to the sleep wait variant (diff) | |
| download | wireguard-linux-728b478d2d358480b333b42d0e10e0fecb20114c.tar.xz wireguard-linux-728b478d2d358480b333b42d0e10e0fecb20114c.zip | |
softirq: Add RT specific softirq accounting
RT requires the softirq processing and local bottomhalf disabled regions to
be preemptible. Using the normal preempt count based serialization is
therefore not possible because this implicitely disables preemption.
RT kernels use a per CPU local lock to serialize bottomhalfs. As
local_bh_disable() can nest the lock can only be acquired on the outermost
invocation of local_bh_disable() and released when the nest count becomes
zero. Tasks which hold the local lock can be preempted so its required to
keep track of the nest count per task.
Add a RT only counter to task struct and adjust the relevant macros in
preempt.h.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309085726.983627589@linutronix.de
Diffstat (limited to 'include/linux/preempt.h')
| -rw-r--r-- | include/linux/preempt.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 69cc8b64aa3a..9881eac0698f 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -79,7 +79,11 @@ #define nmi_count() (preempt_count() & NMI_MASK) #define hardirq_count() (preempt_count() & HARDIRQ_MASK) -#define softirq_count() (preempt_count() & SOFTIRQ_MASK) +#ifdef CONFIG_PREEMPT_RT +# define softirq_count() (current->softirq_disable_cnt & SOFTIRQ_MASK) +#else +# define softirq_count() (preempt_count() & SOFTIRQ_MASK) +#endif #define irq_count() (nmi_count() | hardirq_count() | softirq_count()) /* |