Commit d2865c7d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

Pull scheduler fixes from Ingo Molnar:
 "A CONFIG_STACK_GROWSUP=y fix, and a hotplug llc CPU mask fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Fix unreleased llc_shared_mask bit during CPU hotplug
  sched: Fix end_of_stack() and location of stack canary for architectures using CONFIG_STACK_GROWSUP
parents 8207649c 03bd4e1f

arch/x86/kernel/smpboot.c

+3 −0
Original line number Diff line number Diff line
@@ -1284,6 +1284,9 @@ static void remove_siblinginfo(int cpu) 


	for_each_cpu(sibling, cpu_sibling_mask(cpu))

		cpumask_clear_cpu(cpu, cpu_sibling_mask(sibling));

	for_each_cpu(sibling, cpu_llc_shared_mask(cpu))

		cpumask_clear_cpu(cpu, cpu_llc_shared_mask(sibling));

	cpumask_clear(cpu_llc_shared_mask(cpu));

	cpumask_clear(cpu_sibling_mask(cpu));

	cpumask_clear(cpu_core_mask(cpu));

	c->phys_proc_id = 0;

include/linux/sched.h

+13 −0
Original line number Diff line number Diff line
@@ -2608,9 +2608,22 @@ static inline void setup_thread_stack(struct task_struct *p, struct task_struct 
	task_thread_info(p)->task = p;

}



/*

 * Return the address of the last usable long on the stack.

 *

 * When the stack grows down, this is just above the thread

 * info struct. Going any lower will corrupt the threadinfo.

 *

 * When the stack grows up, this is the highest address.

 * Beyond that position, we corrupt data on the next page.

 */

static inline unsigned long *end_of_stack(struct task_struct *p)

{

#ifdef CONFIG_STACK_GROWSUP

	return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;

#else

	return (unsigned long *)(task_thread_info(p) + 1);

#endif

}



#endif

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