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authorThomas Gleixner <tglx@linutronix.de>2017-06-20 02:37:19 +0300
committerThomas Gleixner <tglx@linutronix.de>2017-06-22 19:21:13 +0300
commitcdd16365b0bd7c0cd19e2cc768b6bdc8021f32c3 (patch)
tree3f64719fa46b4edc5077b0342cf625954eaeb52f /include/linux/irq.h
parent1bb0401680da156ce1549e915e711bf5b2534cc5 (diff)
downloadlinux-cdd16365b0bd7c0cd19e2cc768b6bdc8021f32c3.tar.xz
genirq: Provide irq_fixup_move_pending()
If an CPU goes offline, the interrupts are migrated away, but a eventually pending interrupt move, which has not yet been made effective is kept pending even if the outgoing CPU is the sole target of the pending affinity mask. What's worse is, that the pending affinity mask is discarded even if it would contain a valid subset of the online CPUs. Implement a helper function which allows to avoid these issues. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Keith Busch <keith.busch@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Link: http://lkml.kernel.org/r/20170619235444.691345468@linutronix.de
Diffstat (limited to 'include/linux/irq.h')
-rw-r--r--include/linux/irq.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 7e62e10e5856..d008065e2f4d 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -491,9 +491,14 @@ extern void irq_migrate_all_off_this_cpu(void);
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
void irq_move_irq(struct irq_data *data);
void irq_move_masked_irq(struct irq_data *data);
+bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
#else
static inline void irq_move_irq(struct irq_data *data) { }
static inline void irq_move_masked_irq(struct irq_data *data) { }
+static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
+{
+ return false;
+}
#endif
extern int no_irq_affinity;