From nobody Sun Dec 28 22:49:48 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3DDE0C4167B for ; Mon, 4 Dec 2023 07:29:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234594AbjLDH3e (ORCPT ); Mon, 4 Dec 2023 02:29:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229693AbjLDH3c (ORCPT ); Mon, 4 Dec 2023 02:29:32 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2428BD7 for ; Sun, 3 Dec 2023 23:29:39 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A4FBC433C7; Mon, 4 Dec 2023 07:29:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701674978; bh=lx62nJVG4/6em/8jt1aqDoujqgICoMUEYiBiTLEn73Y=; h=From:To:Cc:Subject:Date:From; b=nog7iae6jWPOzuuLLHIjTtIIR1wUlPeXTtYx6JU36WNc+KBRZQgguWN1dbv5+T5lg Fjzn1RrFvEy7EE7bzcRCdl9yA+A2Mwb0649qdILXy/q5ukZNEZvO2esnJk4EP/S2OB nSWitwqna1qDusCKomMCS0OMAJM4TJq56buV0RbnzZ3hnMDlni73NNqP7xUSGHTXq8 mxE5yVi8INWw6LEC1w4/1kTE/SmR0c+f+dTzj0hMPtKcusfc7oGngdziM8El5jV8jH uzLOtNVVO1umCVcp+pzj/ZIju5PdRuD2HERFscymZylWn22jeuPHpieIlDbwQUFOTf TyE5aygJE8Dww== From: Arnd Bergmann To: Yisen Zhuang , Salil Mehta , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Arnd Bergmann , Jijie Shao , Hao Chen , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: hns3: reduce stack usage in hclge_dbg_dump_tm_pri() Date: Mon, 4 Dec 2023 08:29:26 +0100 Message-Id: <20231204072932.1077878-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Arnd Bergmann This function exceeds the stack frame warning limit: drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c: In function 'hc= lge_dbg_dump_tm_pri': drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:1039:1: error: t= he frame size of 1408 bytes is larger than 1024 bytes [-Werror=3Dframe-larg= er-than=3D] Use dynamic allocation for the largest stack object instead. It would be nice to rewrite this file to completely avoid the extra buffer and just use the one that was already allocated by debugfs, but that is a much larger change. Signed-off-by: Arnd Bergmann --- .../net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c b/d= rivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c index ff3f8f424ad9..9b5d46fdfd6c 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c @@ -981,7 +981,7 @@ static const struct hclge_dbg_item tm_pri_items[] =3D { =20 static int hclge_dbg_dump_tm_pri(struct hclge_dev *hdev, char *buf, int le= n) { - char data_str[ARRAY_SIZE(tm_pri_items)][HCLGE_DBG_DATA_STR_LEN]; + char *data_str; struct hclge_tm_shaper_para c_shaper_para, p_shaper_para; char *result[ARRAY_SIZE(tm_pri_items)], *sch_mode_str; char content[HCLGE_DBG_TM_INFO_LEN]; @@ -991,9 +991,13 @@ static int hclge_dbg_dump_tm_pri(struct hclge_dev *hde= v, char *buf, int len) ret =3D hclge_tm_get_pri_num(hdev, &pri_num); if (ret) return ret; + data_str =3D kcalloc(ARRAY_SIZE(tm_pri_items), HCLGE_DBG_DATA_STR_LEN, + GFP_KERNEL); + if (!data_str) + return -ENOMEM; =20 for (i =3D 0; i < ARRAY_SIZE(tm_pri_items); i++) - result[i] =3D &data_str[i][0]; + result[i] =3D &data_str[i * HCLGE_DBG_DATA_STR_LEN]; =20 hclge_dbg_fill_content(content, sizeof(content), tm_pri_items, NULL, ARRAY_SIZE(tm_pri_items)); @@ -1035,6 +1039,7 @@ static int hclge_dbg_dump_tm_pri(struct hclge_dev *hd= ev, char *buf, int len) pos +=3D scnprintf(buf + pos, len - pos, "%s", content); } =20 + kfree(data_str); return 0; } =20 --=20 2.39.2