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authorThomas Gleixner <tglx@linutronix.de>2021-03-09 11:55:57 +0300
committerThomas Gleixner <tglx@linutronix.de>2021-03-17 18:34:11 +0300
commit47c218dcae6587fb5bce30f1656b13e22391c8e3 (patch)
tree0577017548da523ecaf141594aefd66291d036e7 /include/linux/bottom_half.h
parent8b1c04acad082dec76f3f8f7e1fa13493d6cbb79 (diff)
downloadlinux-47c218dcae6587fb5bce30f1656b13e22391c8e3.tar.xz
tick/sched: Prevent false positive softirq pending warnings on RT
On RT a task which has soft interrupts disabled can block on a lock and schedule out to idle while soft interrupts are pending. This triggers the warning in the NOHZ idle code which complains about going idle with pending soft interrupts. But as the task is blocked soft interrupt processing is temporarily blocked as well which means that such a warning is a false positive. To prevent that check the per CPU state which indicates that a scheduled out task has soft interrupts disabled. 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/20210309085727.527563866@linutronix.de
Diffstat (limited to 'include/linux/bottom_half.h')
-rw-r--r--include/linux/bottom_half.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h
index e4dd613a070e..eed86eb0a1de 100644
--- a/include/linux/bottom_half.h
+++ b/include/linux/bottom_half.h
@@ -32,4 +32,10 @@ static inline void local_bh_enable(void)
__local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
}
+#ifdef CONFIG_PREEMPT_RT
+extern bool local_bh_blocked(void);
+#else
+static inline bool local_bh_blocked(void) { return false; }
+#endif
+
#endif /* _LINUX_BH_H */