lkml.org 
[lkml]   [2022]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v3] irq: consider cpus on nodes are unbalanced
Date
On Thu, Feb 10, 2022 at 12:10:18PM +0800, Ming Lei wrote:
> On Thu, Feb 10, 2022 at 12:10:53PM +0900, Rei Yamamoto wrote:
>> If cpus on a node are offline at boot time, there are
>> difference in the number of nodes between when building affinity
>> masks for present cpus and when building affinity masks for possible
>> cpus. This patch fixes a problem caused by the difference of the
>> number of nodes:
>>
>> - The routine of "numvecs <= nodes" condition can overwrite bits of
>> masks for present cpus in building masks for possible cpus. Fix this
>> problem by making CPU bits, which is not target, not changing.
>>
>> Signed-off-by: Rei Yamamoto <yamamoto.rei@jp.fujitsu.com>
>> Reviewed-by: Ming Lei <ming.lei@redhat.com>
>> ---
>> kernel/irq/affinity.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
>> index f7ff8919dc9b..d2d01565d2ec 100644
>> --- a/kernel/irq/affinity.c
>> +++ b/kernel/irq/affinity.c
>> @@ -269,8 +269,9 @@ static int __irq_build_affinity_masks(unsigned int startvec,
>> */
>> if (numvecs <= nodes) {
>> for_each_node_mask(n, nodemsk) {
>> + cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
>> cpumask_or(&masks[curvec].mask, &masks[curvec].mask,
>> - node_to_cpumask[n]);
>> + nmsk);
>> if (++curvec == last_affv)
>> curvec = firstvec;
>> }
>> --
>> 2.27.0
>>
> --
> Ming

Could you pick this patch up?

Thanks,
Rei

\
 
 \ /
  Last update: 2022-03-30 07:05    [W:0.064 / U:0.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site