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authorPeter Zijlstra <peterz@infradead.org>2015-06-22 14:16:34 +0200
committerIngo Molnar <mingo@kernel.org>2016-09-22 15:25:53 +0200
commit7c3f654d8e18942295eeda42f7d75494443980e0 (patch)
treeb8b4cb3acbb418846eef73c9a296b34434d56b1f /fs/Kconfig
parentaba37660738325d48c913f3a952a7116d6e6a74b (diff)
downloadlinux-7c3f654d8e18942295eeda42f7d75494443980e0.tar.bz2
fs/locks: Replace lg_local with a per-cpu spinlock
As Oleg suggested, replace file_lock_list with a structure containing the hlist head and a spinlock. This completely removes the lglock from fs/locks. Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: dave@stgolabs.net Cc: der.herr@hofr.at Cc: paulmck@linux.vnet.ibm.com Cc: riel@redhat.com Cc: tj@kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'fs/Kconfig')
-rw-r--r--fs/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/Kconfig b/fs/Kconfig
index 2bc7ad775842..3ef62bad8f2b 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -79,6 +79,7 @@ config EXPORTFS_BLOCK_OPS
config FILE_LOCKING
bool "Enable POSIX file locking API" if EXPERT
default y
+ select PERCPU_RWSEM
help
This option enables standard file locking support, required
for filesystems like NFS and for the flock() system