From nobody Wed Nov 27 14:33:53 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F0EF91E1A34; Wed, 9 Oct 2024 18:07:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728497242; cv=none; b=FDVlhdNs53rflxJgYJxT8BMYzbeNUH2FTa6KdeJc6or+2Ys2Xv910MQDaIIZPgXn4bFib8xvhwb4A03uWJGEDvW20WfKIUkchIS+WJcOu1M7mpB4bcvUqPkljWsbMoe1tXBqTBaooYCZubtqt9Uoed7DBCcbuLphOU7IXSsnK68= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728497242; c=relaxed/simple; bh=QWCIBNJNmX4+TG7swbkj7aZiNkC9qbNnmlcDDakdbbQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mMzjkNCiINupEIwMFC56Yl9H33qhtuDFqTJmsI0F+ctcTk4PGBLS7NLji1RBahnhvlMK/5bucmM+DrZa3o++0r0W3Me9Jc9Oz6xnkLhwyY6ds7Llyp1WXQ/DvvH88AOdbBlwL8MHGfJeGROq9D3GxrIxfGhfMgfMfz7GDn9wn54= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hA6hLzEp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hA6hLzEp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4443C4CEE0; Wed, 9 Oct 2024 18:07:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728497241; bh=QWCIBNJNmX4+TG7swbkj7aZiNkC9qbNnmlcDDakdbbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hA6hLzEpFWyGDXIAMJn3qPtajMjZ0ydsTDW+K/ujmWL4Buwjrm8R+ZyS7U6fkhTkG QZrgPMneOetW0mb5wLhsmUvkZpuBgYK30KrYbUym3p8p9nYCWcntd+WJodPthm/4OB G8ZQZDL0lsDXdDXWb/p+FWJTa8hQCKlaGzbuX4f4cWC++aOYESOIjwPKVY97sRAPWV 6VTBy0JWHrvtZNmYsuPpwaYMdX7GIy7ACHTULxkL/EruzFZvMzWzrrgp/rWe/9WVvw 4cC4vvlFW/j14FkgJbGI/xq9W1X6F+CTnWHehoxGSybPbhjBUXmRh76+lqKYzKYV5s QrYKe8Piy2WIA== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 2CD1FCE158E; Wed, 9 Oct 2024 11:07:21 -0700 (PDT) From: "Paul E. McKenney" To: frederic@kernel.org, rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Paul E. McKenney" , Alexei Starovoitov , Andrii Nakryiko , Peter Zijlstra , Kent Overstreet , bpf@vger.kernel.org Subject: [PATCH rcu 10/12] rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader_flavor Date: Wed, 9 Oct 2024 11:07:17 -0700 Message-Id: <20241009180719.778285-10-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This commit causes bit 0x4 of rcutorture.reader_flavor to select the new srcu_read_lock_lite() and srcu_read_unlock_lite() functions. Signed-off-by: Paul E. McKenney Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Peter Zijlstra Cc: Kent Overstreet Cc: --- Documentation/admin-guide/kernel-parameters.txt | 4 ++-- kernel/rcu/rcutorture.c | 7 +++++++ 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index 2d5a09ff6449b..686ea876a89c7 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5426,8 +5426,8 @@ If there is more than one bit set, the readers are entered from low-order bit up, and are exited in the opposite order. For SRCU, the - 0x1 bit is normal readers and the 0x2 bit is - for NMI-safe readers. + 0x1 bit is normal readers, 0x2 NMI-safe readers, + and 0x4 light-weight readers. =20 rcutorture.shuffle_interval=3D [KNL] Set task-shuffle interval (s). Shuffling tasks diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index daf60c988299d..2ae8a5e5e99aa 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -660,6 +660,11 @@ static int srcu_torture_read_lock(void) WARN_ON_ONCE(idx & ~0x1); ret +=3D idx << 1; } + if (reader_flavor & 0x4) { + idx =3D srcu_read_lock_lite(srcu_ctlp); + WARN_ON_ONCE(idx & ~0x1); + ret +=3D idx << 2; + } return ret; } =20 @@ -685,6 +690,8 @@ srcu_read_delay(struct torture_random_state *rrsp, stru= ct rt_read_seg *rtrsp) static void srcu_torture_read_unlock(int idx) { WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor= && (idx & ~0x1))); + if (reader_flavor & 0x4) + srcu_read_unlock_lite(srcu_ctlp, (idx & 0x4) >> 2); if (reader_flavor & 0x2) srcu_read_unlock_nmisafe(srcu_ctlp, (idx & 0x2) >> 1); if ((reader_flavor & 0x1) || !(reader_flavor & 0x7)) --=20 2.40.1