Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37;
From:   David Vernet <void@manifault.com>
To:     bpf@vger.kernel.org
Cc:     ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
        martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev,
        john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
        haoluo@google.com, jolsa@kernel.org, linux-kernel@vger.kernel.org,
        kernel-team@meta.com
Subject: [PATCH bpf-next 0/2] Add new bpf_cpumask_weight() kfunc
Date:   Thu,  7 Dec 2023 15:08:41 -0600
Message-ID: <20231207210843.168466-1-void@manifault.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

It can be useful to query how many bits are set in a cpumask. For
example, if you want to perform special logic for the last remaining
core that's set in a mask. This logic is already exposed through the
main kernel's cpumask header as cpumask_weight(), so it would be useful
to add a new bpf_cpumask_weight() kfunc which wraps it and does the
same.

This patch series was built and tested on top of commit 2146f7fe6e02
("Merge branch 'allocate-bpf-trampoline-on-bpf_prog_pack'").

David Vernet (2):
  bpf: Add bpf_cpumask_weight() kfunc
  selftests/bpf: Add test for bpf_cpumask_weight() kfunc

 Documentation/bpf/cpumasks.rst                |  2 +-
 kernel/bpf/cpumask.c                          | 12 ++++++
 .../selftests/bpf/prog_tests/cpumask.c        |  1 +
 .../selftests/bpf/progs/cpumask_common.h      |  1 +
 .../selftests/bpf/progs/cpumask_success.c     | 43 +++++++++++++++++++
 5 files changed, 58 insertions(+), 1 deletion(-)

-- 
2.42.1