From nobody Wed Nov 27 00:22:54 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 D811D1F76D2; Tue, 15 Oct 2024 16:11:14 +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=1729008674; cv=none; b=QcCzN6vm4fNlhFh2JljHx5jxh8dI9Cin0uZXAZle2iNl9TiBB/GIEsjhJpeHc/nef87jH2dOM21QA9wA894LRMHBBXe0U+FfMTD99UlPUkxCrl1gOEVQF1/ecLv6LAjCnoPF+25qjGmh36L3XTb1EZmTURuIQgy2XiYSVE2+pIA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729008674; c=relaxed/simple; bh=2/hu6Yi0XsmLS7jmPPcP2qqf4oo1mhmwzrHcI6b4xBA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=TEXNULrtbZJfni1wrlEahi2MfG0Oi+b+5yclxf4I2pyMcEn+UnjFrFKBXePZc/OO4kyMioEICRSBqbv+1LsnGbOGECC9xSJphmAQ5jxPtWOkrdxEPgqd/QgLKmes0NiCbd43WpQDRFM67D+i+eOagwpy4vZmewtv5/LbUhNKW0I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eikvUaAA; 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="eikvUaAA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84EBDC4CEE3; Tue, 15 Oct 2024 16:11:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729008674; bh=2/hu6Yi0XsmLS7jmPPcP2qqf4oo1mhmwzrHcI6b4xBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eikvUaAAAV+LFBGasGXysFYWlnzo6ep0sjM6lJ+EOa0ujRPxyeBHVnLdKCwhCg+zu gPsrpkMBFlWeEzNbUPK08SevdPC+tRQynJnAW7uLFw9I5qTtFr81pk8kLe8H0NnZF3 lh/QmqnCf3emspdPnHccaYisFqUE48OqoW/ngm9+E1AxJd4+Akpa06QD5ezS7AxahQ aXMNe/gzffcug8gUaTpuMd1YByQ7qLKCUtCb6zNEiKGYKIMG5oPdn6Xfb9bLnMP9FG LWSKEjc8MEDuQqbPbgGKvy+83kregsyfoZnSBLbHsQbPaDhAJHmDy25Yu/mMIilI4X ijiC2cvzYr1UQ== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id D1EA8CE1D59; Tue, 15 Oct 2024 09:11:13 -0700 (PDT) From: "Paul E. McKenney" To: 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 12/15] rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader_flavor Date: Tue, 15 Oct 2024 09:11:09 -0700 Message-Id: <20241015161112.442758-12-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 52922727006fc..203ec51e41d48 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5431,8 +5431,8 @@ 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 405decec33677..a313cdcb0960f 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -658,6 +658,11 @@ 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 @@ -683,6 +688,8 @@ 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