The patch titled
docbook: some kernel-locking fixes
has been removed from the -mm tree. Its filename was
docbook-some-kernel-locking-fixes.patch
This patch was dropped because an updated version will be merged
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: docbook: some kernel-locking fixes
From: Matti Linnanvuori <mattilinnanvuori@xxxxxxxxx>
Fix a wrong path. Add a chapter about try functions.
http://bugzilla.kernel.org/show_bug.cgi?id=9011
Signed-off-by: Matti Linnanvuori <mattilinnanvuori@xxxxxxxxx>
Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/DocBook/kernel-locking.tmpl | 23 ++++++++++++++++++++
1 file changed, 23 insertions(+)
diff -puN Documentation/DocBook/kernel-locking.tmpl~docbook-some-kernel-locking-fixes Documentation/DocBook/kernel-locking.tmpl
--- a/Documentation/DocBook/kernel-locking.tmpl~docbook-some-kernel-locking-fixes
+++ a/Documentation/DocBook/kernel-locking.tmpl
@@ -694,6 +694,29 @@
</sect1>
</chapter>
+<chapter id="try-variants">
+ <title>The try variants</title>
+
+ <para>
+ <function>spin_trylock()</function> does not spin but returns non-zero if
+ it acquires the spinlock on the first try or 0 if not.
+ </para>
+
+ <para>
+ <function>mutex_trylock()</function> does not suspend your task
+ but returns non-zero if it could lock the mutex on the first try
+ or 0 if not.
+ </para>
+
+ <para>
+ <function>down_trylock()</function> does not suspend your task
+ but returns 0 if it could get the semaphore on the first try or
+ non-zero if not. The return value is the inverse of that of
+ <function>spin_trylock()</function> and <function>mutex_trylock()
+ </function>.
+ </para>
+</chapter>
+
<chapter id="Examples">
<title>Common Examples</title>
<para>
_
Patches currently in -mm which might be from mattilinnanvuori@xxxxxxxxx are
origin.patch
docbook-some-kernel-locking-fixes.patch
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