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Date: Wed, 16 Mar 2011 22:39:37 +0100
From: Arnd Bergmann <arnd@...db.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: [GIT PULL] Total BKL removal, finally
Hi Linus,
Here are the missing pieces of the BKL removal, aside from the
bits that are in the staging and drm trees. You can pull the
trees in any order, there should be no interdependencies.
There was one conflict between this tree and the nfs tree
a few days ago, because an #include <linux/smp_lock.h> was
accidentally added back there, but the file removed here.
If that happens with any other tree, the fix should be to
just remove the offending #include. All patches that are
in linux-next today are fine in this regard.
Thanks,
Arnd
8<-------------------------------------------------------------------
The following changes since commit f5412be599602124d2bdd49947b231dd77c0bf99:
Linux 2.6.38-rc6 (2011-02-21 17:25:52 -0800)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl.git config
Arnd Bergmann (9):
adfs: remove the big kernel lock
tracing: don't trace the BKL
drivers: remove extraneous includes of smp_lock.h
hpfs: remove the BKL
ufs: remove the BKL
x25: remove the BKL
appletalk: remove the BKL
ipx: remove the BKL
BKL: That's all, folks
Matt Fleming (1):
fs/locks.c: Remove stale FIXME left over from BKL conversion
8<-------------------------------------------------------------------
commit 4ba8216cd90560bc402f52076f64d8546e8aefcb
Author: Arnd Bergmann <arnd@...db.de>
Date: Tue Jan 25 22:52:22 2011 +0100
BKL: That's all, folks
This removes the implementation of the big kernel lock,
at last. A lot of people have worked on this in the
past, I so the credit for this patch should be with
everyone who participated in the hunt.
The names on the Cc list are the people that were the
most active in this, according to the recorded git
history, in alphabetical order.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Alan Cox <alan@...ux.intel.com>
Cc: Alessio Igor Bogani <abogani@...ware.it>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Andrew Hendry <andrew.hendry@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Hans Verkuil <hverkuil@...all.nl>
Acked-by: Ingo Molnar <mingo@...e.hu>
Cc: Jan Blunck <jblunck@...radead.org>
Cc: John Kacur <jkacur@...hat.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matthew Wilcox <matthew@....cx>
Cc: Oliver Neukum <oliver@...kum.org>
Cc: Paul Menage <menage@...gle.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Trond Myklebust <Trond.Myklebust@...app.com>
include/linux/hardirq.h | 9 +---
include/linux/smp_lock.h | 65 ----------------------
init/Kconfig | 5 --
kernel/sched.c | 9 +---
lib/Kconfig.debug | 9 ---
lib/Makefile | 1 -
lib/kernel_lock.c | 136 ----------------------------------------------
7 files changed, 2 insertions(+), 232 deletions(-)
commit ae7eb8979ccfa5e9e888101b9c940f20bd0f4115
Author: Matt Fleming <matt.fleming@...ux.intel.com>
Date: Sun Feb 27 13:58:00 2011 +0000
fs/locks.c: Remove stale FIXME left over from BKL conversion
The comment is no longer true as (now that the BKL conversion is
finished) a spinlock _is_ now used to protect file_lock_list,
blocked_list and inode->i_flock.
Signed-off-by: Matt Fleming <matt.fleming@...ux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
fs/locks.c | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
commit b0d0d915d1d1a0fe486849f3e41333c66df620c4
Author: Arnd Bergmann <arnd@...db.de>
Date: Tue Jan 25 21:49:56 2011 +0100
ipx: remove the BKL
This replaces all instances of lock_kernel in the
IPX code with lock_sock. As far as I can tell, this
is safe to do, because there is no global state
that needs to be locked in IPX, and the code does
not recursively take the lock or sleep indefinitely
while holding it.
Compile-tested only.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: David S. Miller <davem@...emloft.net>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: netdev@...r.kernel.org
net/ipx/Kconfig | 1 -
net/ipx/af_ipx.c | 52 ++++++++++++++++++++--------------------------------
2 files changed, 20 insertions(+), 33 deletions(-)
commit 60d9f461a20ba59219fdcdc30cbf8e3a4ad3f625
Author: Arnd Bergmann <arnd@...db.de>
Date: Sun Jan 23 00:21:11 2011 +0100
appletalk: remove the BKL
This changes appletalk to use lock_sock instead of
lock_kernel for serialization. I tried to make sure
that we don't hold the socket lock during sleeping
functions, but I did not try to prove whether the
locks are necessary in the first place.
Compile-tested only.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: David S. Miller <davem@...emloft.net>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
drivers/net/appletalk/Kconfig | 1 -
net/appletalk/ddp.c | 40 ++++++++++++++++------------------------
2 files changed, 16 insertions(+), 25 deletions(-)
commit 77b2283604bdd7053494a97b0e2fee97148206c6
Author: Arnd Bergmann <arnd@...db.de>
Date: Sat Jan 22 23:44:59 2011 +0100
x25: remove the BKL
This replaces all instances of lock_kernel in x25
with lock_sock, taking care to release the socket
lock around sleeping functions (sock_alloc_send_skb
and skb_recv_datagram). It is not clear whether
this is a correct solution, but it seem to be what
other protocols do in the same situation.
Includes a fix suggested by Eric Dumazet.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: David S. Miller <davem@...emloft.net>
Tested-by: Andrew Hendry <andrew.hendry@...il.com>
Cc: linux-x25@...r.kernel.org
Cc: netdev@...r.kernel.org
Cc: Eric Dumazet <eric.dumazet@...il.com>
net/x25/Kconfig | 1 -
net/x25/af_x25.c | 58 ++++++++++++++++------------------------------------
net/x25/x25_out.c | 7 ++++-
3 files changed, 23 insertions(+), 43 deletions(-)
commit 788257d6101d986ac8f2741aaa35974af47f574c
Author: Arnd Bergmann <arnd@...db.de>
Date: Mon Jan 24 10:14:12 2011 +0100
ufs: remove the BKL
This introduces a new per-superblock mutex in UFS to replace
the big kernel lock. I have been careful to avoid nested
calls to lock_ufs and to get the lock order right with
respect to other mutexes, in particular lock_super.
I did not make any attempt to prove that the big kernel
lock is not needed in a particular place in the code,
which is very possible.
The mutex has a significant performance impact, so it is only
used on SMP or PREEMPT configurations.
As Nick Piggin noticed, any allocation inside of the lock
may end up deadlocking when we get to ufs_getfrag_block
in the reclaim task, so we now use GFP_NOFS.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Tested-by: Nick Bowler <nbowler@...iptictech.com>
Cc: Evgeniy Dushistov <dushistov@...l.ru>
Cc: Nick Piggin <npiggin@...il.com>
fs/ufs/Kconfig | 1 -
fs/ufs/inode.c | 78 ++++++++++++++--------------------------------------
fs/ufs/namei.c | 35 +++++++++++------------
fs/ufs/super.c | 64 +++++++++++++++++++++++++------------------
fs/ufs/truncate.c | 5 +--
fs/ufs/ufs.h | 6 +++-
fs/ufs/util.c | 2 +-
7 files changed, 83 insertions(+), 108 deletions(-)
commit 9a311b96c3065f362e3348cb5d7af1a57ca6bff9
Author: Arnd Bergmann <arnd@...db.de>
Date: Sat Jan 22 20:26:12 2011 +0100
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@...db.de>
Acked-by: Andi Kleen <ak@...ux.intel.com>
Cc: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc: linux-fsdevel@...r.kernel.org
fs/hpfs/Kconfig | 2 +-
fs/hpfs/dir.c | 23 +++++++++++------------
fs/hpfs/file.c | 9 ++++-----
fs/hpfs/hpfs_fn.h | 22 ++++++++++++++++++++++
fs/hpfs/inode.c | 9 ++++-----
fs/hpfs/namei.c | 49 ++++++++++++++++++++++++-------------------------
fs/hpfs/super.c | 23 +++++++++--------------
7 files changed, 75 insertions(+), 62 deletions(-)
commit 5edc341313a188d94cde7ef87ac31647cea8601a
Author: Arnd Bergmann <arnd@...db.de>
Date: Tue Jan 25 22:08:05 2011 +0100
drivers: remove extraneous includes of smp_lock.h
These were missed the last time I cleaned this up
globally, because of code moving around or new code
getting merged.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
drivers/scsi/megaraid/megaraid_sas_fp.c | 1 -
drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 -
drivers/staging/easycap/easycap_ioctl.c | 1 -
drivers/target/target_core_device.c | 1 -
drivers/target/target_core_fabric_lib.c | 1 -
drivers/target/target_core_file.c | 1 -
drivers/target/target_core_hba.c | 1 -
drivers/target/target_core_iblock.c | 1 -
drivers/target/target_core_pscsi.c | 1 -
drivers/target/target_core_rd.c | 1 -
drivers/target/target_core_tpg.c | 1 -
drivers/target/target_core_transport.c | 1 -
drivers/tty/n_hdlc.c | 1 -
drivers/tty/n_r3964.c | 1 -
drivers/tty/pty.c | 1 -
drivers/tty/tty_io.c | 1 -
drivers/tty/tty_ldisc.c | 2 --
drivers/tty/vt/selection.c | 1 -
drivers/tty/vt/vc_screen.c | 1 -
drivers/tty/vt/vt.c | 1 -
drivers/tty/vt/vt_ioctl.c | 1 -
21 files changed, 0 insertions(+), 22 deletions(-)
commit f51b452bed4ae5c20e1f8a790e4ed8663d909a40
Author: Arnd Bergmann <arnd@...db.de>
Date: Tue Jan 25 21:54:50 2011 +0100
tracing: don't trace the BKL
No reason to trace it when the last user is gone.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
include/trace/events/bkl.h | 61 --------------------------------------------
lib/kernel_lock.c | 7 -----
2 files changed, 0 insertions(+), 68 deletions(-)
commit 4688a066ecf60086ea82f68edb3b036b567d2c08
Author: Arnd Bergmann <arnd@...db.de>
Date: Sat Jan 22 20:05:05 2011 +0100
adfs: remove the big kernel lock
According to Russell King, adfs was written to not require the big
kernel lock, and all inode updates are done under adfs_dir_lock.
All other metadata in adfs is read-only and does not require locking.
The use of the BKL is the result of various pushdowns from the VFS
operations.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Russell King <rmk@....linux.org.uk>
Cc: Stuart Swales <stuart.swales.croftnuisk@...il.com>
fs/adfs/Kconfig | 1 -
fs/adfs/dir.c | 6 ------
fs/adfs/inode.c | 6 ------
fs/adfs/super.c | 13 +------------
4 files changed, 1 insertions(+), 25 deletions(-)
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