lkml.org 
[lkml]   [2014]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] Revert "arm64: use cpu_online_mask when using forced irq_set_affinity"
Date
From: Byungchul Park <byungchul.park@lge.com>

This reverts commit 601c942176d8ad8334118bddb747e3720bed24f8.

This patch is designed to ensure that the cpu being offlined is not
present in the affinity mask. But it is a bad idea to overwrite the
affinity variable with cpu_online_mask, even in case that the current
affinity already includes onlined cpus.

So revert this patch to replace it with another one doing exactly
what it intends.

Signed-off-by: Byungchul Park <byungchul.park@lge.com>
---
arch/arm64/kernel/irq.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index 0f08dfd..473e5db 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -97,15 +97,11 @@ static bool migrate_one_irq(struct irq_desc *desc)
if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity))
return false;

- if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids)
+ if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
+ affinity = cpu_online_mask;
ret = true;
+ }

- /*
- * when using forced irq_set_affinity we must ensure that the cpu
- * being offlined is not present in the affinity mask, it may be
- * selected as the target CPU otherwise
- */
- affinity = cpu_online_mask;
c = irq_data_get_irq_chip(d);
if (!c->irq_set_affinity)
pr_debug("IRQ%u: unable to set affinity\n", d->irq);
--
1.7.9.5


\
 
 \ /
  Last update: 2014-08-27 11:41    [W:0.052 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site