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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@redhat.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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