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Message-ID: <19845.1211148908@vena.lwn.net>
Date: Sun, 18 May 2008 16:15:08 -0600
From: corbet@....net (Jonathan Corbet)
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Thomas Gleixner <tglx@...utronix.de>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Alexander Viro <viro@....linux.org.uk>,
linux-kernel@...r.kernel.org,
Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [PATCH, RFC] Char dev BKL pushdown v2
OK, since the previous announcement, I've revisited all of the open()
functions which didn't get lock_kernel() calls the first time around.
Alan pointed out that even a completely empty open() might, in fact,
need to acquire the BKL, so now they all do. Hopefully, this completes
this work (at this level - there's plenty of down-pushing to do within
subsystems).
There's a new tree with this stuff:
git://git.lwn.net/linux-2.6.git bkl-removal
Stephen, might it be about time to pull this into linux-next and see
what explodes?
If others have BKL-removal patches which look like 2.6.27 material, I'll
happily collect them in this tree.
Thanks,
jon
P.S. Here's what's in it now:
arch/cris/arch-v10/drivers/eeprom.c | 4 +-
arch/cris/arch-v10/drivers/gpio.c | 3 ++
arch/cris/arch-v10/drivers/i2c.c | 2 +
arch/cris/arch-v10/drivers/sync_serial.c | 34 ++++++++++++++----------
arch/cris/arch-v32/drivers/cryptocop.c | 3 +-
arch/cris/arch-v32/drivers/i2c.c | 2 +
arch/cris/arch-v32/drivers/mach-a3/gpio.c | 4 ++
arch/cris/arch-v32/drivers/mach-fs/gpio.c | 5 ++-
arch/cris/arch-v32/drivers/sync_serial.c | 33 ++++++++++++++---------
arch/mips/kernel/rtlx.c | 7 ++++
arch/mips/kernel/vpe.c | 12 ++++++--
arch/mips/sibyte/common/sb_tbprof.c | 25 ++++++++++++-----
arch/sh/boards/landisk/gio.c | 10 ++++---
arch/x86/kernel/cpuid.c | 25 ++++++++++++-----
arch/x86/kernel/msr.c | 16 ++++++++---
block/bsg.c | 7 ++++
drivers/block/aoe/aoechr.c | 7 ++++
drivers/block/paride/pg.c | 22 +++++++++++----
drivers/block/paride/pt.c | 8 ++++-
drivers/char/cs5535_gpio.c | 2 +
drivers/char/drm/drm_fops.c | 9 ++++--
drivers/char/dsp56k.c | 14 +++++++--
drivers/char/dtlk.c | 3 ++
drivers/char/ip2/ip2main.c | 34 +-----------------------
drivers/char/ipmi/ipmi_devintf.c | 8 ++++-
drivers/char/lp.c | 38 ++++++++++++++++++---------
drivers/char/mbcs.c | 5 +++
drivers/char/mem.c | 10 +++++--
drivers/char/misc.c | 3 ++
drivers/char/pc8736x_gpio.c | 2 +
drivers/char/pcmcia/cm4000_cs.c | 26 +++++++++++++-----
drivers/char/pcmcia/cm4040_cs.c | 23 ++++++++++++----
drivers/char/ppdev.c | 2 +
drivers/char/raw.c | 3 ++
drivers/char/scx200_gpio.c | 2 +
drivers/char/snsc.c | 5 ++-
drivers/char/tb0219.c | 2 +
drivers/char/tlclk.c | 19 ++++++++-----
drivers/char/tty_io.c | 27 +++++++++++++++++--
drivers/char/vc_screen.c | 9 ++++--
drivers/char/viotape.c | 3 ++
drivers/char/vr41xx_giu.c | 2 +
drivers/char/xilinx_hwicap/xilinx_hwicap.c | 6 +++-
drivers/firewire/fw-cdev.c | 16 ++++++++---
drivers/hid/hidraw.c | 3 ++
drivers/i2c/i2c-dev.c | 22 +++++++++++----
drivers/ide/ide-tape.c | 7 ++++
drivers/ieee1394/dv1394.c | 6 +++-
drivers/ieee1394/raw1394.c | 3 ++
drivers/ieee1394/video1394.c | 18 +++++++++---
drivers/infiniband/core/ucm.c | 2 +
drivers/infiniband/core/user_mad.c | 7 ++++
drivers/infiniband/core/uverbs_main.c | 9 ++++--
drivers/infiniband/hw/ipath/ipath_file_ops.c | 2 +
drivers/input/input.c | 16 ++++++++---
drivers/isdn/capi/capi.c | 17 +++++++-----
drivers/isdn/hardware/eicon/divamnt.c | 16 +++++++----
drivers/isdn/hardware/eicon/divasi.c | 2 +
drivers/isdn/hardware/eicon/divasmain.c | 2 +
drivers/isdn/i4l/isdn_common.c | 3 +-
drivers/macintosh/adb.c | 18 +++++++++---
drivers/media/dvb/dvb-core/dvbdev.c | 4 ++
drivers/media/video/videodev.c | 4 ++
drivers/misc/phantom.c | 9 ++++--
drivers/mtd/mtdchar.c | 22 +++++++++++----
drivers/mtd/ubi/cdev.c | 7 ++++
drivers/net/ppp_generic.c | 2 +
drivers/net/wan/cosa.c | 22 +++++++++++----
drivers/pcmcia/pcmcia_ioctl.c | 25 ++++++++++++-----
drivers/rtc/rtc-dev.c | 12 ++++++--
drivers/s390/char/fs3270.c | 23 +++++++++++-----
drivers/s390/char/tape_char.c | 12 ++++++--
drivers/s390/char/vmlogrdr.c | 8 ++++-
drivers/s390/char/vmur.c | 12 ++++++--
drivers/sbus/char/bpp.c | 3 ++
drivers/sbus/char/vfc_dev.c | 5 +++
drivers/scsi/3w-9xxx.c | 3 ++
drivers/scsi/3w-xxxx.c | 3 ++
drivers/scsi/aacraid/linit.c | 3 ++
drivers/scsi/ch.c | 4 ++
drivers/scsi/dpt_i2o.c | 5 +++
drivers/scsi/gdth.c | 3 ++
drivers/scsi/megaraid.c | 5 ++-
drivers/scsi/megaraid/megaraid_sas.c | 2 +
drivers/scsi/osst.c | 15 +++++++++-
drivers/scsi/sg.c | 16 +++++++++--
drivers/scsi/st.c | 11 ++++++-
drivers/spi/spidev.c | 3 ++
drivers/telephony/phonedev.c | 3 ++
drivers/uio/uio.c | 17 ++++++++----
drivers/usb/core/devio.c | 2 +
drivers/usb/core/file.c | 3 ++
drivers/usb/gadget/printer.c | 3 +-
drivers/usb/mon/mon_bin.c | 6 ++++
drivers/video/fbmem.c | 15 +++++++---
fs/char_dev.c | 7 ++--
include/linux/smp_lock.h | 13 +++++++++
sound/core/sound.c | 15 +++++++++-
sound/sound_core.c | 5 +++
99 files changed, 739 insertions(+), 248 deletions(-)
Jonathan Corbet (65):
bsg: cdev lock_kernel() pushdown
cris: cdev lock_kernel() pushdown
mips: cdev lock_kernel() pushdown
sh: cdev lock_kernel() pushdown
x86: cdev lock_kernel() pushdown
i2c: cdev lock_kernel() pushdown
cosa: cdev lock_kernel() pushdown
pcmcia: cdev lock_kernel() pushdown
ieee1394: cdev lock_kernel() pushdown
rtc: cdev lock_kernel() pushdown
drivers/s390: cdev lock_kernel() pushdown
AoE: cdev lock_kernel() pushdown
paride: cdev lock_kernel() pushdown
mtdchar: cdev lock_kernel() pushdown
UBI: cdev lock_kernel() pushdown
firewire: cdev lock_kernel() pushdown
HID: cdev lock_kernel() pushdown
Input: cdev lock_kernel() pushdown
UIO: cdev lock_kernel() pushdown
cm40x0: cdev lock_kernel() pushdown
ipmi: cdev lock_kernel() pushdown
mem: cdev lock_kernel() pushdown
misc: cdev lock_kernel() pushdown
viotape: cdev lock_kernel pushdown ()
mbcs: cdev lock_kernel() pushdown
lp: cdev lock_kernel() pushdown
drm: cdev lock_kernel() pushdown
phonedev: cdev lock_kernel() pushdown
ide-tape: cdev lock_kernel() pushdown
sg: cdev lock_kernel() pushdown
osst: cdev lock_kernel() pushdown.
aacraid: cdev lock_kernel() pushdown
st: cdev lock_kernel() pushdown
gdth: cdev lock_kernel() pushdown
isdn: cdev lock_kernel() pushdown
usbcore: cdev lock_kernel() pushdown
dvb: cdev lock_kernel() pushdown
fbmem: cdev lock_kernel() pushdown
sound: cdev lock_kernel() pushdown
snsc: cdev lock_kernel() pushdown
tty: cdev lock_kernel() pushdown
Add "no BKL needed" comments to several drivers
spidev: BKL pushdown
vcs: BKL pushdown
xilinx icap: BKL pushdown
tlckl: BKL pushdown
raw: BKL pushdown
dsp56k: BKL pushdown
infiniband: more BKL pushdown
phantom: BKL pushdown
bpp: bkl pushdown
videopix: BKL pushdown
dpt_i20: BKL pushdown
changer: BKL pushdown
CAPI: BKL pushdown
divamnt: BKL pushdown
adb: BKL pushdown
printer gadget: BKL pushdown
USB Monitor: BKL pushdown
usbdev: BKL pushdown
videodev: BKL pushdown
Add cycle_kernel_lock()
Add a bunch of cycle_kernel_lock() calls
Add a comment in chrdev_open()
Remove the lock_kernel() call from chrdev_open()
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