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softirq: Make softirq control and processing RT aware

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Provide a local lock based serialization for soft interrupts on RT which
allows the local_bh_disabled() sections and servicing soft interrupts to be
preemptible.

Provide the necessary inline helpers which allow to reuse the bulk of the
softirq processing code.

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/20210309085727.426370483@linutronix.de
This commit is contained in:
Thomas Gleixner
2021-03-09 09:55:56 +01:00
parent f02fc963e9
commit 8b1c04acad
2 changed files with 182 additions and 8 deletions
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2
include/linux/bottom_half.h
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@@ -4,7 +4,7 @@
#include <linux/preempt.h>
#ifdef CONFIG_TRACE_IRQFLAGS
#if defined(CONFIG_PREEMPT_RT) || defined(CONFIG_TRACE_IRQFLAGS)
extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
#else
static __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)