From nobody Tue Sep 29 00:43:30 2026 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79A3D423A80 for ; Fri, 14 Aug 2026 07:54:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786694049; cv=none; b=rXZrQzAoc4P+7bvS4nKC798xZmOhX4P5Q6IaIsaPp6xVedM/UV3Urg0qyG04kXrQsUJmk9AcdLG6J0EqWV0JjbJAs4CHGsJsg5hz3/0QnUASPzmnOAbE9F5xoOd61sPzRlRym3mcJRApmolTa4Qrt24Hd93WPUsws/iZHqmeQS4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786694049; c=relaxed/simple; bh=SDItqCcU3oyEjVwLMBnmx6oHs5I+6rUqJxv1NQpo9DQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=FFmdC3dkqY0su5l9wINdvU+U6582fYPd1bKDiGePOEzUgPEgFOLEXsL2V0/wMjdMvB2s8Gi5T1A65w77nsRlmGXSkcTlAa5l3onXQBjEp2iEInSGu2K59UVhpu2SHuBfJDO+gyMOdTXxvIceeKiXa+CLHn1qDdpVtik4ypDvhYI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from localhost.localdomain (unknown [111.196.241.250]) by APP-01 (Coremail) with SMTP id qwCowAAX7O+byX5qVHaeBQ--.63440S2; Fri, 14 Aug 2026 15:54:03 +0800 (CST) From: Pengpeng Hou To: Dan Williams Cc: linux-kernel@vger.kernel.org, Pengpeng Hou Subject: [PATCH v2] async_tx: use the channel-switch Kconfig symbol Date: Fri, 14 Aug 2026 15:54:03 +0800 Message-ID: <20260814075403.13950-1-pengpeng@iscas.ac.cn> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qwCowAAX7O+byX5qVHaeBQ--.63440S2 X-Coremail-Antispam: 1UD129KBjvJXoW7tw1xZw4rWw1fAF4UGFW3Jrb_yoW8Xr17pF 4Duay7tF4ruFW7XrZ7GwnxuwnxXwn3GrW7AryDGw1rGrWFvr1UZr1jgr42vr4kZwsrtayF vr93tayFyr9rZrJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUyG14x267AKxVWUJVW8JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_JF0_Jw1lYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1l42xK82IYc2Ij64vI r41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8Gjc xK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1Y6r17MIIYrxkI7VAKI48JMIIF0xvE2Ix0 cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8V AvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E 14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7VUj9a97UUUUU== X-CM-SenderInfo: pshqw1xhqjqxpvfd2hldfou0/ ASYNC_TX_ENABLE_CHANNEL_SWITCH is the Kconfig symbol selected by DMA engine providers that need async_tx channel switching. CONFIG_ASYNC_TX_CHANNEL_SWITCH is not generated by Kconfig, so the shortcut in async_tx.h tests an impossible symbol. Use the generated CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH name instead. Fixes: b802c8410ca9 ("async_tx: deprecate broken support for channel switch= ing") Assisted-by: Codex:gpt-5 Signed-off-by: Pengpeng Hou --- Changes since v1: https://lore.kernel.org/all/20260624081404.82604-1-pengpe= ng@iscas.ac.cn/ - rebase on current async_tx sources - document that only ASYNC_TX_ENABLE_CHANNEL_SWITCH is generated by Kconfig The Kconfig name and preprocessor path were reviewed statically; no DMA- engine runtime test was performed. include/linux/async_tx.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h index 1ca9f9e05f4f..1659a06c034b 100644 --- a/include/linux/async_tx.h +++ b/include/linux/async_tx.h @@ -74,7 +74,7 @@ struct async_submit_ctl { void *scribble; }; =20 -#if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH) +#if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_ENABLE_CHANNEL_= SWITCH) #define async_tx_issue_pending_all dma_issue_pending_all =20 /** --=20 2.50.1 (Apple Git-155)