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

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Pull cpu idle fixes from Thomas Gleixner:
 - Add a missing irq enable. Fallout of the idle conversion
 - Fix stackprotector wreckage caused by the idle conversion

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  idle: Enable interrupts in the weak arch_cpu_idle() implementation
  idle: Add the stack canary init to cpu_startup_entry()
This commit is contained in:
Linus Torvalds 2013-06-20 08:16:07 -10:00
commit 805e318548
2 changed files with 17 additions and 12 deletions
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12
arch/x86/kernel/process.c
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@ -277,18 +277,6 @@ void exit_idle(void)
}
#endif
void arch_cpu_idle_prepare(void)
{
/*
* If we're the non-boot CPU, nothing set the stack canary up
* for us. CPU0 already has it initialized but no harm in
* doing it again. This is a good place for updating it, as
* we wont ever return from this function (so the invalid
* canaries already on the stack wont ever trigger).
*/
boot_init_stack_canary();
}
void arch_cpu_idle_enter(void)
{
local_touch_nmi();

17
kernel/cpu/idle.c
View File

@ -5,6 +5,7 @@
#include <linux/cpu.h>
#include <linux/tick.h>
#include <linux/mm.h>
#include <linux/stackprotector.h>
#include <asm/tlb.h>
@ -58,6 +59,7 @@ void __weak arch_cpu_idle_dead(void) { }
void __weak arch_cpu_idle(void)
{
cpu_idle_force_poll = 1;
local_irq_enable();
}
/*
@ -112,6 +114,21 @@ static void cpu_idle_loop(void)
void cpu_startup_entry(enum cpuhp_state state)
{
/*
* This #ifdef needs to die, but it's too late in the cycle to
* make this generic (arm and sh have never invoked the canary
* init for the non boot cpus!). Will be fixed in 3.11
*/
#ifdef CONFIG_X86
/*
* If we're the non-boot CPU, nothing set the stack canary up
* for us. The boot CPU already has it initialized but no harm
* in doing it again. This is a good place for updating it, as
* we wont ever return from this function (so the invalid
* canaries already on the stack wont ever trigger).
*/
boot_init_stack_canary();
#endif
current_set_polling();
arch_cpu_idle_prepare();
cpu_idle_loop();