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authorRichard Weinberger <richard@nod.at>2016-08-18 14:57:17 +0200
committerThomas Gleixner <tglx@linutronix.de>2016-09-06 18:30:20 +0200
commite6d4989a9ad1ccc343f29578a461612ed80fc6c5 (patch)
tree97b092d2f0505c61d15cf4f2025fddb0c5f6c614 /include/linux/relay.h
parent017c59c042d01fc84cae7a8ea475861e702c77ab (diff)
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relayfs: Convert to hotplug state machine
Install the callbacks via the state machine. They are installed at run time but relay_prepare_cpu() does not need to be invoked by the boot CPU because relay_open() was not yet invoked and there are no pools that need to be created. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: rt@linutronix.de Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20160818125731.27256-3-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/relay.h')
-rw-r--r--include/linux/relay.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/relay.h b/include/linux/relay.h
index eb295e373b90..ecbb34a382b8 100644
--- a/include/linux/relay.h
+++ b/include/linux/relay.h
@@ -288,5 +288,11 @@ static inline void subbuf_start_reserve(struct rchan_buf *buf,
*/
extern const struct file_operations relay_file_operations;
+#ifdef CONFIG_RELAY
+int relay_prepare_cpu(unsigned int cpu);
+#else
+#define relay_prepare_cpu NULL
+#endif
+
#endif /* _LINUX_RELAY_H */