linux-kernel - [PATCH] block: export trace_block

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Date:	Tue, 25 Sep 2012 09:57:55 +1000
From:	NeilBrown <neilb@...e.de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: [PATCH] block: export trace_block_unplug


Hi Jens,
 is there any chance this can be in the next merge window?  I'm
adding block tracing to md and found I need another export.

Thanks,
NeilBrown


This allows stacked devices (like md/raid5) to provide blktrace
tracing, including unplug events.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: NeilBrown <neilb@...e.de>

diff --git a/block/blk-core.c b/block/blk-core.c
index 4b4dbdf..ef55ae0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -40,6 +40,7 @@
 EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
 EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);
 EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);
+EXPORT_TRACEPOINT_SYMBOL_GPL(block_unplug);
 
 DEFINE_IDA(blk_queue_ida);
 

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