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| author | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-07-30 19:15:24 +0200 |
|---|---|---|
| committer | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-08-04 12:59:06 +0200 |
| commit | 096b7bdc8663c16417ff5fbec42622302e6886e1 (patch) | |
| tree | bbd80f3cf2ac7fe766f602b8d20d53dfd7759ec8 /arch/cris/arch-v10 | |
| parent | 90276a1a64e2ab732e26e3ac68febbf3ad04c517 (diff) | |
| download | linux-096b7bdc8663c16417ff5fbec42622302e6886e1.tar.gz linux-096b7bdc8663c16417ff5fbec42622302e6886e1.tar.bz2 linux-096b7bdc8663c16417ff5fbec42622302e6886e1.zip | |
cris: autoconvert trivial BKL users to private mutex
All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.
None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.
Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.
file=$1
name=$2
if grep -q lock_kernel ${file} ; then
if grep -q 'include.*linux.mutex.h' ${file} ; then
sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
else
sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
fi
sed -i ${file} \
-e "/^#include.*linux.mutex.h/,$ {
1,/^\(static\|int\|long\)/ {
/^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);
} }" \
-e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
-e '/[ ]*cycle_kernel_lock();/d'
else
sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \
-e '/cycle_kernel_lock()/d'
fi
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Diffstat (limited to 'arch/cris/arch-v10')
| -rw-r--r-- | arch/cris/arch-v10/drivers/eeprom.c | 2 | ||||
| -rw-r--r-- | arch/cris/arch-v10/drivers/i2c.c | 2 |
2 files changed, 0 insertions, 4 deletions
diff --git a/arch/cris/arch-v10/drivers/eeprom.c b/arch/cris/arch-v10/drivers/eeprom.c index c3405507a3d1..5047a33043bd 100644 --- a/arch/cris/arch-v10/drivers/eeprom.c +++ b/arch/cris/arch-v10/drivers/eeprom.c @@ -28,7 +28,6 @@ #include <linux/init.h> #include <linux/delay.h> #include <linux/interrupt.h> -#include <linux/smp_lock.h> #include <linux/wait.h> #include <asm/uaccess.h> #include "i2c.h" @@ -376,7 +375,6 @@ int __init eeprom_init(void) /* Opens the device. */ static int eeprom_open(struct inode * inode, struct file * file) { - cycle_kernel_lock(); if(iminor(inode) != EEPROM_MINOR_NR) return -ENXIO; if(imajor(inode) != EEPROM_MAJOR_NR) diff --git a/arch/cris/arch-v10/drivers/i2c.c b/arch/cris/arch-v10/drivers/i2c.c index 399e089bed7a..54e2e1adf085 100644 --- a/arch/cris/arch-v10/drivers/i2c.c +++ b/arch/cris/arch-v10/drivers/i2c.c @@ -14,7 +14,6 @@ #include <linux/module.h> #include <linux/sched.h> -#include <linux/smp_lock.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/fs.h> @@ -566,7 +565,6 @@ i2c_readreg(unsigned char theSlave, unsigned char theReg) static int i2c_open(struct inode *inode, struct file *filp) { - cycle_kernel_lock(); return 0; } |