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 F31CDBA42; Tue, 15 Jul 2025 13:31:08 +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=1752586269; cv=none; b=WKc11M0mwA1tiMrTZ0ENGyaGhJYQfWsOceqlzFKWp2cBzdOC8ptRpU2vvrDEsYy3u/hBVfSljNNN0co5ZfWle7q/sVNs2PDQtwvPVjebxauc4OKhQy7QOuTfRerPspFhFHsZLaZvJ1Q8tdZOxqy1/XUrprUd90c5o9XiZM2Kwk8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752586269; c=relaxed/simple; bh=kgKbmL+jlLm478GoqLEbkdd/kvCpSQHZcWmla6SBD4U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZDnep+iCC02PZSJWxgLGrjOmtspSAaEpHFlSnOLTFi1kF3INhVuS+4cPVE+RjxAessdzmOktOVVPClizlB84lhe9JMc6w2M1kzhicyPVM3VSAyN2m8SqSk02eHDGb4HOT0ecCxbQE9qnngwxxqP/9XeM1z6xXJMT/hARubl6bdw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zz7BT87k; 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="zz7BT87k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87FC9C4CEE3; Tue, 15 Jul 2025 13:31:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1752586268; bh=kgKbmL+jlLm478GoqLEbkdd/kvCpSQHZcWmla6SBD4U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zz7BT87k2VsQE/aV8uEoibnKQIxXMwqY9ic8a5FvuHW00nJdLYYXAfvb7HqEdANpW vCsSDta5YiC+FUz6W6i7Hn9QNqH14zo1gYxuB528aleMgudrNUfyGRtNE3vsZyTQkJ uRDRb4n24FAdrDjiX4MKvDn7exLRlVNr3vvXVBNk= 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 5.15 68/77] um: vector: Reduce stack usage in vector_eth_configure() Date: Tue, 15 Jul 2025 15:14:07 +0200 Message-ID: <20250715130754.456435557@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250715130751.668489382@linuxfoundation.org> References: <20250715130751.668489382@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-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 c63ccf1ab4a20..41fc93ce4d372 100644 --- a/arch/um/drivers/vector_kern.c +++ b/arch/um/drivers/vector_kern.c @@ -1603,35 +1603,19 @@ 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); tasklet_setup(&vp->tx_poll, vector_tx_poll); -- 2.39.5