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 364CD2E11D3; Tue, 15 Jul 2025 13:21:44 +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=1752585704; cv=none; b=P8V9JjcupSl+Gn0m4Fejb5uqg7aLQ1OKSBP02f+SjHdRbkvIE3klQEQzqnym4pEM/1BKppTngZ5eogpLCwbzE8/ScXorGsxh68VdsOnVGYk/N7tAE982Xra1S1Ey1JZdBP/0VMBy4aiFhN222FOsm1iUiVu0T7+lypyi6KA3Pvc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752585704; c=relaxed/simple; bh=FcUVviDNxnpMyUt7SC19GnQoZDeUb5gCTRGJ9KI6ouY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IoD3V0k6zsmmsYiRuJyrehsOR40KVEcAjOkvLeotC561fTpglYvv0CBBP5XegCXgxDiwOj3vq9dQSTYrVfBfZrG49l8gu2jh+HHSaT9XkaROYitRlCgiDjsWRCu4u5VwBWv+tMHZuDmUUmvwlRfdTnQhzW0Pq4NN2e8PSgwjZN0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Is7e7kLB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Is7e7kLB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B284AC4CEE3; Tue, 15 Jul 2025 13:21:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1752585704; bh=FcUVviDNxnpMyUt7SC19GnQoZDeUb5gCTRGJ9KI6ouY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Is7e7kLBpUyqbG9mf9yLLyDysU6ETxWiaOgoI7JB1MDiJIBxX9WceEhAhOOEdvyps /dgXOE7sof2+ztsIVwV1gYFNfPC3Z0hDeRE6n5JZmItgK4bPk7u4bLd0pjCyMFHuy+ U7kHjO5LvDWX55sisFHdxH+fVY3ipu2UG1v8lib8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, kernel test robot , Tiwei Bie , Johannes Berg , Sasha Levin Subject: [PATCH 6.12 140/163] um: vector: Reduce stack usage in vector_eth_configure() Date: Tue, 15 Jul 2025 15:13:28 +0200 Message-ID: <20250715130814.451639667@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250715130808.777350091@linuxfoundation.org> References: <20250715130808.777350091@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tiwei Bie [ Upstream commit 2d65fc13be85c336c56af7077f08ccd3a3a15a4a ] When compiling with clang (19.1.7), initializing *vp using a compound literal may result in excessive stack usage. Fix it by initializing the required fields of *vp individually. Without this patch: $ objdump -d arch/um/drivers/vector_kern.o | ./scripts/checkstack.pl x86_64 0 ... 0x0000000000000540 vector_eth_configure [vector_kern.o]:1472 ... With this patch: $ objdump -d arch/um/drivers/vector_kern.o | ./scripts/checkstack.pl x86_64 0 ... 0x0000000000000540 vector_eth_configure [vector_kern.o]:208 ... Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202506221017.WtB7Usua-lkp@intel.com/ Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250623110829.314864-1-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- arch/um/drivers/vector_kern.c | 42 +++++++++++------------------------ 1 file changed, 13 insertions(+), 29 deletions(-) diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c index 64c09db392c16..7a88b13d289f1 100644 --- a/arch/um/drivers/vector_kern.c +++ b/arch/um/drivers/vector_kern.c @@ -1592,35 +1592,19 @@ static void vector_eth_configure( device->dev = dev; - *vp = ((struct vector_private) - { - .list = LIST_HEAD_INIT(vp->list), - .dev = dev, - .unit = n, - .options = get_transport_options(def), - .rx_irq = 0, - .tx_irq = 0, - .parsed = def, - .max_packet = get_mtu(def) + ETH_HEADER_OTHER, - /* TODO - we need to calculate headroom so that ip header - * is 16 byte aligned all the time - */ - .headroom = get_headroom(def), - .form_header = NULL, - .verify_header = NULL, - .header_rxbuffer = NULL, - .header_txbuffer = NULL, - .header_size = 0, - .rx_header_size = 0, - .rexmit_scheduled = false, - .opened = false, - .transport_data = NULL, - .in_write_poll = false, - .coalesce = 2, - .req_size = get_req_size(def), - .in_error = false, - .bpf = NULL - }); + INIT_LIST_HEAD(&vp->list); + vp->dev = dev; + vp->unit = n; + vp->options = get_transport_options(def); + vp->parsed = def; + vp->max_packet = get_mtu(def) + ETH_HEADER_OTHER; + /* + * TODO - we need to calculate headroom so that ip header + * is 16 byte aligned all the time + */ + vp->headroom = get_headroom(def); + vp->coalesce = 2; + vp->req_size = get_req_size(def); dev->features = dev->hw_features = (NETIF_F_SG | NETIF_F_FRAGLIST); INIT_WORK(&vp->reset_tx, vector_reset_tx); -- 2.39.5