linux-kernel - [PATCH 1/3] Memory management livelock

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Message-ID: <Pine.LNX.4.64.0809241450560.18811@hs20-bc2-1.build.redhat.com>
Date:	Wed, 24 Sep 2008 14:51:28 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org,
	agk@...hat.com, mbroz@...hat.com, chris@...chsys.com
Subject: [PATCH 1/3] Memory management livelock

A generic function wait_action_schedule that allows to use wait_on_bit_lock just
like mutexes.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>

---
 include/linux/wait.h |    8 +++++++-
 kernel/wait.c        |    7 +++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

Index: linux-2.6.27-rc7-devel/include/linux/wait.h
===================================================================
--- linux-2.6.27-rc7-devel.orig/include/linux/wait.h	2008-09-24 03:20:59.000000000 +0200
+++ linux-2.6.27-rc7-devel/include/linux/wait.h	2008-09-24 03:26:34.000000000 +0200
@@ -513,7 +513,13 @@ static inline int wait_on_bit_lock(void 
 		return 0;
 	return out_of_line_wait_on_bit_lock(word, bit, action, mode);
 }
-	
+
+/**
+ * wait_action_schedule - this function can be passed to wait_on_bit or
+ * wait_on_bit_lock and it will call just schedule().
+ */
+int wait_action_schedule(void *);
+
 #endif /* __KERNEL__ */
 
 #endif
Index: linux-2.6.27-rc7-devel/kernel/wait.c
===================================================================
--- linux-2.6.27-rc7-devel.orig/kernel/wait.c	2008-09-24 03:22:58.000000000 +0200
+++ linux-2.6.27-rc7-devel/kernel/wait.c	2008-09-24 03:24:10.000000000 +0200
@@ -251,3 +251,10 @@ wait_queue_head_t *bit_waitqueue(void *w
 	return &zone->wait_table[hash_long(val, zone->wait_table_bits)];
 }
 EXPORT_SYMBOL(bit_waitqueue);
+
+int wait_action_schedule(void *word)
+{
+	schedule();
+	return 0;
+}
+EXPORT_SYMBOL(wait_action_schedule);

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