From mboxrd@z Thu Jan 1 00:00:00 1970 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 1B2153161BF; Wed, 25 Feb 2026 05:01:39 +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=1771995699; cv=none; b=AA2c69lrSstxeL7I9mQqkW4xPj2FOFuyX4FJvOcpKhm0s1SFjl1LzDv9qNNFuXKjGIWs0hyQtIlVHTmPz1kGOR2AQ12hi18OuICMZjFcrFuMz+vxktAPpg6G2D98oBR5iImcfSSmataswiuzPN2QYWyIuS/hUq4fLvjZ62uvMrQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771995699; c=relaxed/simple; bh=hthDZ9ReGeQ2kRKYJdyU+XM1DwCu0LqDFbreT7Za8ck=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rbQozwSix0xQ87XCgkd0bcMO71GglKxPFwTqL803zQCeOg5L87T/aKnpPvlvbuLdzzlY26F8qYOFJ+5qVQsZDzmFeiT9ypsQYRf4Am2Wee/VhWeG9mukTs52GgaHD4BtwomML1oF9KoFvjgkAm6mu3C83ydjujnlEf7c9io5dbk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZVrKOF8i; 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="ZVrKOF8i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D767FC116D0; Wed, 25 Feb 2026 05:01:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771995699; bh=hthDZ9ReGeQ2kRKYJdyU+XM1DwCu0LqDFbreT7Za8ck=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZVrKOF8ii7/yuS5iX78W41EMMdVZSGU75YcWjAmzRwVgoI9iSka+mEq7ocds/gn+4 Tml+vlkdMTCT/M4VtT3eZn0654j3uoeaL7KuqGx7KiSyNgUWck6ReOQ8i5JQhzfKQV WezNviuD6WCWW5075H05Kp0wT5jAAFxV2fe2Bo/+Fu9tVD1R2Of3JHJLUx2GEHnBC6 Sbq2pe+RLYdVGWUBnUNyzCRY73UJyIaGnztrbbtp6QXn2JuH4FGdJt5Sz/aU5bjug/ sTWbVm0ro9X/wGly5uQkL/KQGG57xFJK9cgfcf3NvumVafCPppAflNdQeK3rK18vY0 Ssz3C7s++wMAw== From: Tejun Heo To: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev Cc: void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, emil@etsalapatis.com, hannes@cmpxchg.org, mkoutny@suse.com, cgroups@vger.kernel.org, Tejun Heo Subject: [PATCH 27/34] sched_ext: Convert scx_dump_state() spinlock to raw spinlock Date: Tue, 24 Feb 2026 19:01:02 -1000 Message-ID: <20260225050109.1070059-28-tj@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225050109.1070059-1-tj@kernel.org> References: <20260225050109.1070059-1-tj@kernel.org> Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The scx_dump_state() function uses a regular spinlock to serialize access. In a subsequent patch, this function will be called while holding scx_sched_lock, which is a raw spinlock, creating a lock nesting violation. Convert the dump_lock to a raw spinlock and use the guard macro for cleaner lock management. Signed-off-by: Tejun Heo --- kernel/sched/ext.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index be800ed5d9f3..2a1db509bcbc 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -5201,7 +5201,7 @@ static void scx_dump_task(struct seq_buf *s, struct scx_dump_ctx *dctx, static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len) { - static DEFINE_SPINLOCK(dump_lock); + static DEFINE_RAW_SPINLOCK(dump_lock); static const char trunc_marker[] = "\n\n~~~~ TRUNCATED ~~~~\n"; struct scx_sched *sch = scx_root; struct scx_dump_ctx dctx = { @@ -5213,11 +5213,10 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len) }; struct seq_buf s; struct scx_event_stats events; - unsigned long flags; char *buf; int cpu; - spin_lock_irqsave(&dump_lock, flags); + guard(raw_spinlock_irqsave)(&dump_lock); seq_buf_init(&s, ei->dump, dump_len); @@ -5342,8 +5341,6 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len) if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker)) memcpy(ei->dump + dump_len - sizeof(trunc_marker), trunc_marker, sizeof(trunc_marker)); - - spin_unlock_irqrestore(&dump_lock, flags); } static void scx_error_irq_workfn(struct irq_work *irq_work) -- 2.53.0