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xen: Resume PMU from non-atomic context 

Resuming PMU currently triggers a warning from ___might_sleep() (assuming
CONFIG_DEBUG_ATOMIC_SLEEP is set) when xen_pmu_init() allocates GFP_KERNEL
page because we are in state resembling atomic context.

Move resuming PMU to xen_arch_resume() which is called in regular context.
For symmetry move suspending PMU to xen_arch_suspend() as well.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <stable@vger.kernel.org> # 4.3
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Boris Ostrovsky 2015-12-02 12:10:48 -05:00 committed by David Vrabel
parent 3de88d622f
commit de0afc9bde
1 changed files with 10 additions and 10 deletions
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20
arch/x86/xen/suspend.c
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@ -68,26 +68,16 @@ static void xen_pv_post_suspend(int suspend_cancelled)
void xen_arch_pre_suspend(void)
{
int cpu;
for_each_online_cpu(cpu)
xen_pmu_finish(cpu);
if (xen_pv_domain())
xen_pv_pre_suspend();
}
void xen_arch_post_suspend(int cancelled)
{
int cpu;
if (xen_pv_domain())
xen_pv_post_suspend(cancelled);
else
xen_hvm_post_suspend(cancelled);
for_each_online_cpu(cpu)
xen_pmu_init(cpu);
}
static void xen_vcpu_notify_restore(void *data)
@ -106,10 +96,20 @@ static void xen_vcpu_notify_suspend(void *data)
void xen_arch_resume(void)
{
int cpu;
on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
for_each_online_cpu(cpu)
xen_pmu_init(cpu);
}
void xen_arch_suspend(void)
{
int cpu;
for_each_online_cpu(cpu)
xen_pmu_finish(cpu);
on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
}