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Commit ccb1ec95 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull timer fixes from Thomas Gleixner:
 "The itimer removal one is not strictly a fix, but I really wanted to
  avoid a rebase of the urgent ones."

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "clocksource: Load the ACPI PM clocksource asynchronously"
  clockevents: tTack broadcast device mode change in tick_broadcast_switch_to_oneshot()
  itimer: Use printk_once instead of WARN_ONCE
  nohz: Fix stale jiffies update in tick_nohz_restart()
  tick: Document TICK_ONESHOT config option
  proc: stats: Use arch_idle_time for idle and iowait times if available
  itimer: Schedule silent NULL pointer fixup in setitimer() for removal
parents 4a1d7544 d48fc63f

Documentation/feature-removal-schedule.txt

+8 −0
Original line number Original line Diff line number Diff line
@@ -531,3 +531,11 @@ Why: There appear to be no production users of the get_robust_list syscall, 
	of ASLR. It was only ever intended for debugging, so it should be

	of ASLR. It was only ever intended for debugging, so it should be

	removed.

	removed.

Who:	Kees Cook <keescook@chromium.org>

Who:	Kees Cook <keescook@chromium.org>



----------------------------



What:	setitimer accepts user NULL pointer (value)

When:	3.6

Why:	setitimer is not returning -EFAULT if user pointer is NULL. This

	violates the spec.

Who:	Sasikantha Babu <sasikanth.v19@gmail.com>

drivers/clocksource/acpi_pm.c

+8 −16
Original line number Original line Diff line number Diff line
@@ -23,7 +23,6 @@ 
#include <linux/init.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/pci.h>

#include <linux/delay.h>

#include <linux/delay.h>

#include <linux/async.h>

#include <asm/io.h>

#include <asm/io.h>





/*

/*
@@ -180,15 +179,17 @@ static int verify_pmtmr_rate(void) 
/* Number of reads we try to get two different values */

/* Number of reads we try to get two different values */

#define ACPI_PM_READ_CHECKS 10000

#define ACPI_PM_READ_CHECKS 10000





static void __init acpi_pm_clocksource_async(void *unused, async_cookie_t cookie)

static int __init init_acpi_pm_clocksource(void)

{

{

	cycle_t value1, value2;

	cycle_t value1, value2;

	unsigned int i, j = 0;

	unsigned int i, j = 0;





	if (!pmtmr_ioport)

		return -ENODEV;





	/* "verify" this timing source: */

	/* "verify" this timing source: */

	for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {

	for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {

		usleep_range(100 * j, 100 * j + 100);

		udelay(100 * j);

		value1 = clocksource_acpi_pm.read(&clocksource_acpi_pm);

		value1 = clocksource_acpi_pm.read(&clocksource_acpi_pm);

		for (i = 0; i < ACPI_PM_READ_CHECKS; i++) {

		for (i = 0; i < ACPI_PM_READ_CHECKS; i++) {

			value2 = clocksource_acpi_pm.read(&clocksource_acpi_pm);

			value2 = clocksource_acpi_pm.read(&clocksource_acpi_pm);
@@ -202,34 +203,25 @@ static void __init acpi_pm_clocksource_async(void *unused, async_cookie_t cookie 
			       " 0x%#llx, 0x%#llx - aborting.\n",

			       " 0x%#llx, 0x%#llx - aborting.\n",

			       value1, value2);

			       value1, value2);

			pmtmr_ioport = 0;

			pmtmr_ioport = 0;

			return;

			return -EINVAL;

		}

		}

		if (i == ACPI_PM_READ_CHECKS) {

		if (i == ACPI_PM_READ_CHECKS) {

			printk(KERN_INFO "PM-Timer failed consistency check "

			printk(KERN_INFO "PM-Timer failed consistency check "

			       " (0x%#llx) - aborting.\n", value1);

			       " (0x%#llx) - aborting.\n", value1);

			pmtmr_ioport = 0;

			pmtmr_ioport = 0;

			return;

			return -ENODEV;

		}

		}

	}

	}





	if (verify_pmtmr_rate() != 0){

	if (verify_pmtmr_rate() != 0){

		pmtmr_ioport = 0;

		pmtmr_ioport = 0;

		return;

		return -ENODEV;

	}

	}





	clocksource_register_hz(&clocksource_acpi_pm,

	return clocksource_register_hz(&clocksource_acpi_pm,

						PMTMR_TICKS_PER_SEC);

						PMTMR_TICKS_PER_SEC);

}

}





static int __init init_acpi_pm_clocksource(void)

{

	if (!pmtmr_ioport)

		return -ENODEV;



	async_schedule(acpi_pm_clocksource_async, NULL);

	return 0;

}



/* We use fs_initcall because we want the PCI fixups to have run

/* We use fs_initcall because we want the PCI fixups to have run

 * but we still need to load before device_initcall

 * but we still need to load before device_initcall

 */

 */

fs/proc/stat.c

+28 −6
Original line number Original line Diff line number Diff line
@@ -18,19 +18,39 @@ 
#ifndef arch_irq_stat

#ifndef arch_irq_stat

#define arch_irq_stat() 0

#define arch_irq_stat() 0

#endif

#endif

#ifndef arch_idle_time



#define arch_idle_time(cpu) 0

#ifdef arch_idle_time

#endif



static cputime64_t get_idle_time(int cpu)

{

	cputime64_t idle;



	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];

	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))

		idle += arch_idle_time(cpu);

	return idle;

}



static cputime64_t get_iowait_time(int cpu)

{

	cputime64_t iowait;



	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];

	if (cpu_online(cpu) && nr_iowait_cpu(cpu))

		iowait += arch_idle_time(cpu);

	return iowait;

}



#else





static u64 get_idle_time(int cpu)

static u64 get_idle_time(int cpu)

{

{

	u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);

	u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);





	if (idle_time == -1ULL) {

	if (idle_time == -1ULL)

		/* !NO_HZ so we can rely on cpustat.idle */

		/* !NO_HZ so we can rely on cpustat.idle */

		idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];

		idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];

		idle += arch_idle_time(cpu);

	else

	} else

		idle = usecs_to_cputime64(idle_time);

		idle = usecs_to_cputime64(idle_time);





	return idle;

	return idle;
@@ -49,6 +69,8 @@ static u64 get_iowait_time(int cpu) 
	return iowait;

	return iowait;

}

}





#endif



static int show_stat(struct seq_file *p, void *v)

static int show_stat(struct seq_file *p, void *v)

{

{

	int i, j;

	int i, j;

kernel/itimer.c

+6 −2
Original line number Original line Diff line number Diff line
@@ -284,8 +284,12 @@ SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value, 
	if (value) {

	if (value) {

		if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))

		if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))

			return -EFAULT;

			return -EFAULT;

	} else

	} else {

		memset((char *) &set_buffer, 0, sizeof(set_buffer));

		memset(&set_buffer, 0, sizeof(set_buffer));

		printk_once(KERN_WARNING "%s calls setitimer() with new_value NULL pointer."

			    " Misfeature support will be removed\n",

			    current->comm);

	}





	error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);

	error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);

	if (error || !ovalue)

	if (error || !ovalue)

kernel/time/Kconfig

+4 −0
Original line number Original line Diff line number Diff line 
#

#

# Timer subsystem related configuration options

# Timer subsystem related configuration options

#

#



# Core internal switch. Selected by NO_HZ / HIGH_RES_TIMERS. This is

# only related to the tick functionality. Oneshot clockevent devices

# are supported independ of this.

config TICK_ONESHOT

config TICK_ONESHOT

	bool

	bool