Patch "sched/preempt, xen: Use need_resched() instead of should_resched()" has been added to the 4.1-stable tree

Patch "sched/preempt, xen: Use need_resched() instead of should_resched()" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    sched/preempt, xen: Use need_resched() instead of should_resched()

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sched-preempt-xen-use-need_resched-instead-of-should_resched.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0fa2f5cb2b0ecd8d56baa51f35f09aab234eb0bf Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Wed, 15 Jul 2015 12:52:01 +0300
Subject: sched/preempt, xen: Use need_resched() instead of should_resched()

From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

commit 0fa2f5cb2b0ecd8d56baa51f35f09aab234eb0bf upstream.

This code is used only when CONFIG_PREEMPT=n and only in non-atomic context:
xen_in_preemptible_hcall is set only in privcmd_ioctl_hypercall().
Thus preempt_count is zero and should_resched() is equal to need_resched().

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Graf <agraf@suse.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150715095201.12246.49283.stgit@buzz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/xen/preempt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/xen/preempt.c
+++ b/drivers/xen/preempt.c
@@ -31,7 +31,7 @@ EXPORT_SYMBOL_GPL(xen_in_preemptible_hca
 asmlinkage __visible void xen_maybe_preempt_hcall(void)
 {
 	if (unlikely(__this_cpu_read(xen_in_preemptible_hcall)
-		     && should_resched())) {
+		     && need_resched())) {
 		/*
 		 * Clear flag as we may be rescheduled on a different
 		 * cpu.


Patches currently in stable-queue which might be from khlebnikov@yandex-team.ru are

queue-4.1/ovs-do-not-allocate-memory-from-offline-numa-node.patch
queue-4.1/sched-preempt-xen-use-need_resched-instead-of-should_resched.patch
queue-4.1/sched-preempt-fix-cond_resched_lock-and-cond_resched_softirq.patch