[PATCH v2 1/3] drivers/xen/preempt: use need_resched() instead of should_resched() · Konstantin Khlebnikov <hidden> · 2015-07-15
[PATCH v2 3/3] sched/preempt: fix cond_resched_lock() and cond_resched_softirq() · Konstantin Khlebnikov <hidden> · 2015-07-15
Re: [PATCH v2 3/3] sched/preempt: fix cond_resched_lock() and cond_resched_softirq() · Eric Dumazet <hidden> · 2015-07-15
Re: [PATCH v2 3/3] sched/preempt: fix cond_resched_lock() and cond_resched_softirq() · Konstantin Khlebnikov <hidden> · 2015-07-15
Re: [PATCH v2 3/3] sched/preempt: fix cond_resched_lock() and cond_resched_softirq() · Peter Zijlstra <peterz@infradead.org> · 2015-07-15
[PATCH v2 2/3] KVM: PPC: Book3S HV: Use need_resched() instead of should_resched() · Konstantin Khlebnikov <hidden> · 2015-07-15
Re: [Xen-devel] [PATCH v2 1/3] drivers/xen/preempt: use need_resched() instead of should_resched() · David Vrabel <hidden> · 2015-07-20

Re: [PATCH v2 3/3] sched/preempt: fix cond_resched_lock() and cond_resched_softirq()

From: Eric Dumazet <hidden>
Date: 2015-07-15 12:16:43
Also in: linux-arch, lkml

On Wed, 2015-07-15 at 12:52 +0300, Konstantin Khlebnikov wrote:

These functions check should_resched() before unlocking spinlock/bh-enable:
preempt_count always non-zero => should_resched() always returns false.
cond_resched_lock() worked iff spin_needbreak is set.

Interesting, this definitely used to work (linux-3.11)

Any idea of which commit broke things ?

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