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* [patch] buffer: memorder fix
@ 2007-01-20  7:05 Nick Piggin
  0 siblings, 0 replies; only message in thread
From: Nick Piggin @ 2007-01-20  7:05 UTC (permalink / raw)
  To: Andrew Morton, Linus Torvalds, Linux Kernel Mailing List,
	Linux Memory Management List

Anyone mind telling me why unlock_buffer, unlike unlock_page, thinks it can
clear the lock without ensuring the critical section is closed (ie. with a

Signed-off-by: Nick Piggin <>

Index: linux-2.6/fs/buffer.c
--- linux-2.6.orig/fs/buffer.c
+++ linux-2.6/fs/buffer.c
@@ -78,6 +78,7 @@ EXPORT_SYMBOL(__lock_buffer);
 void fastcall unlock_buffer(struct buffer_head *bh)
+	smp_mb__before_clear_bit();
 	wake_up_bit(&bh->b_state, BH_Lock);

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2007-01-20  7:05 [patch] buffer: memorder fix Nick Piggin

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