From patchwork Fri Oct 18 15:14:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 13841941 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5850BD30016 for ; Fri, 18 Oct 2024 15:16:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=NGsNYJyizCJbNwNUHsGpSxDWG0JTrkN/fC3Sa5bnBWo=; b=Cy3HBO+wBjtn1p2SjcdVwU988e ExsnRQPrRxyFHnoDfiGvtVk2EXclPpe9xYwlGr0JlS7+8OXqoMmHE5fPHi34PqnEUEcc5uglYDmfC S8yWK0yPto9zDezfGclh41Sd6UARwFWKFn7lPnOGMUDEY9nPWHhwwYv+LOxPbrjl8HP6GR5R7n4sn 4ZWoMDLgq2UFH+2qNeWxm5NavBB7Zc3BT3RS8QKet9+VOtecHHMjuhq1ymvBSYa6g58TwrCCvEeYB EYVk9Dh/TLvOv3h+a6g4GQMAJfPWG9u7TULx93xkajuKYxYOnyHQEvufc/E5C0yh8uoxj7jGjMLVW mOdcqrNA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t1oiR-00000001A71-3KpI; Fri, 18 Oct 2024 15:16:35 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t1ogr-00000001A05-0FWB; Fri, 18 Oct 2024 15:14:58 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 1C3135C5DA2; Fri, 18 Oct 2024 15:14:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1663C4CEC3; Fri, 18 Oct 2024 15:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729264496; bh=wGv8jPPiROeuMxdNHPFP2YovhdUZEU8BVdG/fDTbVUk=; h=From:To:Cc:Subject:Date:From; b=r6v2Ui0IRj6XKF+J/obS7ioyIJ41+8RMhQmnTdTxUqxRwAMLyD5vNxrj7PQ2VLzwC xtB1VWF2Z9P/miSklSkUTBewkOX4YuyzipIFzjM7e1jgQ5xdDMHf6VHS3tU+Zoy6/C GhAMdJUVeeoqjupZi6bIpf+asTlNfChkyW2femw6bItSD70XgG5Y4K7FMFoIcZ5bRB /FiKp7QVVnPOpMCmEOfg7CIVL5/1SoMFgxeuPox10E89mW5R+GlQ15d7pB1+xgWsEs jgXZmxjX3Ojm1+yyrhP0XAJI8/HRzajHr1T4nrvzTlx26EUQ32IV4kVtjN3A6Lbwny 3S1m4tb2P3YgA== From: Arnd Bergmann To: Tiffany Lin , Andrew-CT Chen , Yunfei Dong , Mauro Carvalho Chehab , Matthias Brugger , AngeloGioacchino Del Regno , Nathan Chancellor Cc: Arnd Bergmann , Nick Desaulniers , Bill Wendling , Justin Stitt , Hans Verkuil , Sebastian Fricke , Benjamin Gaignard , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, llvm@lists.linux.dev Subject: [PATCH] media: mediatek: vcodec: mark vdec_vp9_slice_map_counts_eob_coef noinline Date: Fri, 18 Oct 2024 15:14:42 +0000 Message-Id: <20241018151448.3694052-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.5 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241018_081457_167079_5642CB75 X-CRM114-Status: GOOD ( 13.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Arnd Bergmann With KASAN enabled, clang fails to optimize the inline version of vdec_vp9_slice_map_counts_eob_coef() properly, leading to kilobytes of temporary values spilled to the stack: drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c:1526:12: error: stack frame size (2160) exceeds limit (2048) in 'vdec_vp9_slice_update_prob' [-Werror,-Wframe-larger-than] This seems to affect all versions of clang including the latest (clang-20), but the degree of stack overhead is different per release. Marking the function as noinline_for_stack is harmless here and avoids the problem completely. Signed-off-by: Arnd Bergmann --- I have not come to a conclusion on how exactly clang fails to do this right, but can provide the .config and/or preprocessed source files and command line if we think this should be fixed in clang. --- .../mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c index eea709d93820..47c302745c1d 100644 --- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c +++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_req_lat_if.c @@ -1188,7 +1188,8 @@ static int vdec_vp9_slice_setup_lat(struct vdec_vp9_slice_instance *instance, return ret; } -static +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack void vdec_vp9_slice_map_counts_eob_coef(unsigned int i, unsigned int j, unsigned int k, struct vdec_vp9_slice_frame_counts *counts, struct v4l2_vp9_frame_symbol_counts *counts_helper)