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Date: Sun, 6 Dec 2009 18:58:27 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: [GIT pull] bkl core patches for 2.6.33
Linus,
Please pull the latest bkl-core-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git bkl-core-for-linus
Thanks,
tglx
------------------>
Jonathan Corbet (2):
pm_qos: remove BKL
pm_qos: clean up racy global "name" variable
Thomas Gleixner (2):
sys: Remove BKL from sys_reboot
bkl: pushdown BKL locking to do_sysctl()
arch/ia64/ia32/sys_ia32.c | 2 --
arch/mips/kernel/linux32.c | 2 --
arch/parisc/kernel/sys_parisc32.c | 2 --
arch/powerpc/kernel/sys_ppc32.c | 2 --
arch/s390/kernel/compat_linux.c | 2 --
arch/sparc/kernel/sys_sparc32.c | 2 --
arch/x86/ia32/sys_ia32.c | 2 --
kernel/pm_qos_params.c | 20 ++++++++------------
kernel/sys.c | 14 +++++++-------
kernel/sysctl.c | 6 ++++--
10 files changed, 19 insertions(+), 35 deletions(-)
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index 625ed8f..c0ed49c 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -1670,10 +1670,8 @@ sys32_sysctl (struct sysctl32 __user *args)
return -EFAULT;
set_fs(KERNEL_DS);
- lock_kernel();
ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *) &oldlen,
newvalp, (size_t) a32.newlen);
- unlock_kernel();
set_fs(old_fs);
if (oldvalp && put_user (oldlen, (int __user *) compat_ptr(a32.oldlenp)))
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 6242bc6..3744608 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -302,10 +302,8 @@ SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
oldlenp = (size_t __user *)addr;
}
- lock_kernel();
error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
- unlock_kernel();
if (oldlenp) {
if (!error) {
if (get_user(oldlen, (size_t __user *)addr) ||
diff --git a/arch/parisc/kernel/sys_parisc32.c b/arch/parisc/kernel/sys_parisc32.c
index 561388b..0d3bff2 100644
--- a/arch/parisc/kernel/sys_parisc32.c
+++ b/arch/parisc/kernel/sys_parisc32.c
@@ -137,11 +137,9 @@ asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
oldlenp = (size_t *)addr;
}
- lock_kernel();
error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
(void __user *)(u64)tmp.oldval, oldlenp,
(void __user *)(u64)tmp.newval, tmp.newlen);
- unlock_kernel();
if (oldlenp) {
if (!error) {
if (get_user(oldlen, (size_t *)addr)) {
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index b97c2d6..934c0f9 100644
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -555,11 +555,9 @@ asmlinkage long compat_sys_sysctl(struct __sysctl_args32 __user *args)
return -EFAULT;
}
- lock_kernel();
error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
compat_ptr(tmp.oldval), oldlenp,
compat_ptr(tmp.newval), tmp.newlen);
- unlock_kernel();
if (oldlenp) {
if (!error) {
if (get_user(oldlen, oldlenp) ||
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 0debcec..ef9c2c1 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -562,10 +562,8 @@ asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
oldlenp = (size_t __user *)addr;
}
- lock_kernel();
error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
oldlenp, compat_ptr(tmp.newval), tmp.newlen);
- unlock_kernel();
if (oldlenp) {
if (!error) {
if (get_user(oldlen, (size_t __user *)addr) ||
diff --git a/arch/sparc/kernel/sys_sparc32.c b/arch/sparc/kernel/sys_sparc32.c
index 04e28b2..6266ef0 100644
--- a/arch/sparc/kernel/sys_sparc32.c
+++ b/arch/sparc/kernel/sys_sparc32.c
@@ -627,14 +627,12 @@ asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
oldlenp = (size_t __user *)addr;
}
- lock_kernel();
error = do_sysctl((int __user *)(unsigned long) tmp.name,
tmp.nlen,
(void __user *)(unsigned long) tmp.oldval,
oldlenp,
(void __user *)(unsigned long) tmp.newval,
tmp.newlen);
- unlock_kernel();
if (oldlenp) {
if (!error) {
if (get_user(oldlen, (size_t __user *)addr) ||
diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
index 9f55271..32a88e4 100644
--- a/arch/x86/ia32/sys_ia32.c
+++ b/arch/x86/ia32/sys_ia32.c
@@ -477,10 +477,8 @@ asmlinkage long sys32_sysctl(struct sysctl_ia32 __user *args32)
return -EFAULT;
set_fs(KERNEL_DS);
- lock_kernel();
ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *)&oldlen,
newvalp, (size_t) a32.newlen);
- unlock_kernel();
set_fs(old_fs);
if (oldvalp && put_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index dfdec52..3db49b9 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -29,7 +29,6 @@
#include <linux/pm_qos_params.h>
#include <linux/sched.h>
-#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/time.h>
@@ -344,37 +343,33 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
}
EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
-#define PID_NAME_LEN sizeof("process_1234567890")
-static char name[PID_NAME_LEN];
+#define PID_NAME_LEN 32
static int pm_qos_power_open(struct inode *inode, struct file *filp)
{
int ret;
long pm_qos_class;
+ char name[PID_NAME_LEN];
- lock_kernel();
pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
if (pm_qos_class >= 0) {
filp->private_data = (void *)pm_qos_class;
- sprintf(name, "process_%d", current->pid);
+ snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
ret = pm_qos_add_requirement(pm_qos_class, name,
PM_QOS_DEFAULT_VALUE);
- if (ret >= 0) {
- unlock_kernel();
+ if (ret >= 0)
return 0;
- }
}
- unlock_kernel();
-
return -EPERM;
}
static int pm_qos_power_release(struct inode *inode, struct file *filp)
{
int pm_qos_class;
+ char name[PID_NAME_LEN];
pm_qos_class = (long)filp->private_data;
- sprintf(name, "process_%d", current->pid);
+ snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
pm_qos_remove_requirement(pm_qos_class, name);
return 0;
@@ -385,13 +380,14 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
{
s32 value;
int pm_qos_class;
+ char name[PID_NAME_LEN];
pm_qos_class = (long)filp->private_data;
if (count != sizeof(s32))
return -EINVAL;
if (copy_from_user(&value, buf, sizeof(s32)))
return -EFAULT;
- sprintf(name, "process_%d", current->pid);
+ snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
pm_qos_update_requirement(pm_qos_class, name, value);
return sizeof(s32);
diff --git a/kernel/sys.c b/kernel/sys.c
index 255475d..22ea955 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -8,7 +8,6 @@
#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/mman.h>
-#include <linux/smp_lock.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/prctl.h>
@@ -349,6 +348,9 @@ void kernel_power_off(void)
machine_power_off();
}
EXPORT_SYMBOL_GPL(kernel_power_off);
+
+static DEFINE_MUTEX(reboot_mutex);
+
/*
* Reboot system call: for obvious reasons only root may call it,
* and even root needs to set up some magic numbers in the registers
@@ -381,7 +383,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
cmd = LINUX_REBOOT_CMD_HALT;
- lock_kernel();
+ mutex_lock(&reboot_mutex);
switch (cmd) {
case LINUX_REBOOT_CMD_RESTART:
kernel_restart(NULL);
@@ -397,20 +399,18 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
case LINUX_REBOOT_CMD_HALT:
kernel_halt();
- unlock_kernel();
do_exit(0);
panic("cannot halt");
case LINUX_REBOOT_CMD_POWER_OFF:
kernel_power_off();
- unlock_kernel();
do_exit(0);
break;
case LINUX_REBOOT_CMD_RESTART2:
if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) {
- unlock_kernel();
- return -EFAULT;
+ ret = -EFAULT;
+ break;
}
buffer[sizeof(buffer) - 1] = '\0';
@@ -433,7 +433,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
ret = -EINVAL;
break;
}
- unlock_kernel();
+ mutex_unlock(&reboot_mutex);
return ret;
}
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0d949c5..72040e5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1848,6 +1848,8 @@ int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *ol
return -EFAULT;
}
+ lock_kernel();
+
for (head = sysctl_head_next(NULL); head;
head = sysctl_head_next(head)) {
error = parse_table(name, nlen, oldval, oldlenp,
@@ -1858,6 +1860,8 @@ int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *ol
break;
}
}
+
+ unlock_kernel();
return error;
}
@@ -1873,10 +1877,8 @@ SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
if (error)
goto out;
- lock_kernel();
error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
tmp.newval, tmp.newlen);
- unlock_kernel();
out:
return error;
}
--
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