This is a note to let you know that I've just added the patch titled
fpga: dfl: fme: Fix cpu hotplug issue in performance reporting
to the 5.13-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:
fpga-dfl-fme-fix-cpu-hotplug-issue-in-performance-reporting.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ec6446d5304b3c3dd692a1e244df7e40bbb5af36 Mon Sep 17 00:00:00 2001
From: Kajol Jain <kjain@xxxxxxxxxxxxx>
Date: Tue, 13 Jul 2021 13:12:16 +0530
Subject: fpga: dfl: fme: Fix cpu hotplug issue in performance reporting
From: Kajol Jain <kjain@xxxxxxxxxxxxx>
commit ec6446d5304b3c3dd692a1e244df7e40bbb5af36 upstream.
The performance reporting driver added cpu hotplug
feature but it didn't add pmu migration call in cpu
offline function.
This can create an issue incase the current designated
cpu being used to collect fme pmu data got offline,
as based on current code we are not migrating fme pmu to
new target cpu. Because of that perf will still try to
fetch data from that offline cpu and hence we will not
get counter data.
Patch fixed this issue by adding pmu_migrate_context call
in fme_perf_offline_cpu function.
Fixes: 724142f8c42a ("fpga: dfl: fme: add performance reporting support")
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Xu Yilun <yilun.xu@xxxxxxxxx>
Acked-by: Wu Hao <hao.wu@xxxxxxxxx>
Signed-off-by: Kajol Jain <kjain@xxxxxxxxxxxxx>
Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/fpga/dfl-fme-perf.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/fpga/dfl-fme-perf.c
+++ b/drivers/fpga/dfl-fme-perf.c
@@ -953,6 +953,8 @@ static int fme_perf_offline_cpu(unsigned
return 0;
priv->cpu = target;
+ perf_pmu_migrate_context(&priv->pmu, cpu, target);
+
return 0;
}
Patches currently in stable-queue which might be from kjain@xxxxxxxxxxxxx are
queue-5.13/fpga-dfl-fme-fix-cpu-hotplug-issue-in-performance-reporting.patch
