From:   Will Deacon <will@kernel.org>
To:     linux-kernel@vger.kernel.org
Cc:     kernel-team@android.com, Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Waiman Long <longman@redhat.com>,
        Zefan Li <lizefan.x@bytedance.com>, Tejun Heo <tj@kernel.org>,
        Johannes Weiner <hannes@cmpxchg.org>, cgroups@vger.kernel.org
Subject: [PATCH 0/2] Fix broken cpuset affinity handling on heterogeneous systems
Date:   Tue, 31 Jan 2023 22:17:17 +0000
Message-Id: <20230131221719.3176-1-will@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Hi folks,

These two patches fix a couple of CPU affinity issues involving cpusets
on heterogeneous systems. A concrete example of this is running 32-bit
tasks on recent arm64 SoCs, where some of the cores are only capable of
64-bit execution.

The first patch (from Peter) fixes a regression introduced during the
recent merge window which is causing test failures in Android where the
problematic patches have been backported. The second patch fixes a
longer-standing issue, which I noticed while testing fixes for the
initial regression.

Ideally, both of these would land together, but fixing the regression
for 6.2 is my main concern.

Anyway, I don't think either Peter or I would call ourselves cpuset
experts (far from it!), so please have a look.

Cheers,

Will

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Zefan Li <lizefan.x@bytedance.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: cgroups@vger.kernel.org

--->8

Peter Zijlstra (1):
  cpuset: Fix cpuset_cpus_allowed() to not filter offline CPUs

Will Deacon (1):
  cpuset: Call set_cpus_allowed_ptr() with appropriate mask for task

 kernel/cgroup/cpuset.c | 57 +++++++++++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 12 deletions(-)

-- 
2.39.1.456.gfc5497dd1b-goog