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authorArnd Bergmann <arnd@arndb.de>2011-01-22 20:26:12 +0100
committerArnd Bergmann <arnd@arndb.de>2011-03-02 22:27:36 +0100
commit9a311b96c3065f362e3348cb5d7af1a57ca6bff9 (patch)
treeaed281e9ff7c5e689895ff838e886dff77e3e2e9 /fs/hpfs/hpfs_fn.h
parent5edc341313a188d94cde7ef87ac31647cea8601a (diff)
hpfs: remove the BKL
This removes the BKL in hpfs in a rather awful way, by making the code only work on uniprocessor systems without kernel preemption, as suggested by Andi Kleen. The HPFS code probably has close to zero remaining users on current kernels, all archeological uses of the file system can probably be done with the significant restrictions. The hpfs_lock/hpfs_unlock functions are left in the code, sincen Mikulas has indicated that he is still interested in fixing it in a better way. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Andi Kleen <ak@linux.intel.com> Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: linux-fsdevel@vger.kernel.org
Diffstat (limited to 'fs/hpfs/hpfs_fn.h')
-rw-r--r--fs/hpfs/hpfs_fn.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index 1c43dbea55e..c15adbca07f 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -342,3 +342,25 @@ static inline time32_t gmt_to_local(struct super_block *s, time_t t)
extern struct timezone sys_tz;
return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
}
+
+/*
+ * Locking:
+ *
+ * hpfs_lock() is a leftover from the big kernel lock.
+ * Right now, these functions are empty and only left
+ * for documentation purposes. The file system no longer
+ * works on SMP systems, so the lock is not needed
+ * any more.
+ *
+ * If someone is interested in making it work again, this
+ * would be the place to start by adding a per-superblock
+ * mutex and fixing all the bugs and performance issues
+ * caused by that.
+ */
+static inline void hpfs_lock(struct super_block *s)
+{
+}
+
+static inline void hpfs_unlock(struct super_block *s)
+{
+}