From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 82184C43458 for ; Thu, 2 Jul 2026 07:35:53 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4grTFg4J0Nz2xJT; Thu, 02 Jul 2026 17:35:51 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2001:41d0:203:375::b6" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1782977751; cv=none; b=L+DhfcuJltj4AlzY/FQAZ1Yc4hgy6EIhY2vXBj96DzO+zU+08Cnv0O+lzYt/eLzXI1i1zNe/56hP2uCqJf8YM+rl3mjXZwgmpUDK7sFL5spxWy7qk/om/9xCNUwuiWqJfmUhWabu1W9jRtIuSaXLL1iUuCiKIaSbm1woiGxCHS0/tCNLP1i6MhTku4W+KLwEYnqnzANJqXm9+O3eYx+Ec1PVBHVAa+nXAQvX6IF2BBUBR+fQLrKrR0t0RoYNerCwNs4teWcFZFuvUcVghwmsVgQgWRqNwTHYWce1Bsj9Xfwd8xvSeJwsphsfvgj/BpnZJJIVJUZxadXDH8W/F+JT2Q== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1782977751; c=relaxed/relaxed; bh=cdXAMvaGTLXZ4tRHqX+15mFjqPO5NJv7/lbzInUeZeM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=YTvBNct8JQQY+nOwKX/ymb/05ZuMHBsmE3FqXFwcwWagfdJWQ/hhBK8eS56tCARdGpUX5XNLlxgIV9VbGDdfeuVZrdDIK5Zg/BHdBQVAqQTn9aSFiSJIvxiq8KsKBIPs1x/kwLsvNACAjL23lcyo0RYBj4OxeBJLOou5WdKmZIyM1+Z/oJb6vI3FixI6mwbAsswOl2xEW7yZ1WCI0bARzMd4eHqDwLSxy+oBSuZQdSy7M+HaaKQNEqL5w4Jwd74iMKTpFzNhLlb5z9uLAMDROTNLHRf9tAHfbWnZZBM+J55wTGJDo3vNxJkOnD/5nVIaWvgKXP/NqLJaC5rmJNpjVA== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.dev; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=UUw36nfQ; dkim-atps=neutral; spf=pass (client-ip=2001:41d0:203:375::b6; helo=out-182.mta1.migadu.com; envelope-from=lance.yang@linux.dev; receiver=lists.ozlabs.org) smtp.mailfrom=linux.dev Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=UUw36nfQ; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.dev (client-ip=2001:41d0:203:375::b6; helo=out-182.mta1.migadu.com; envelope-from=lance.yang@linux.dev; receiver=lists.ozlabs.org) X-Greylist: delayed 426 seconds by postgrey-1.37 at boromir; Thu, 02 Jul 2026 17:35:46 AEST Received: from out-182.mta1.migadu.com (out-182.mta1.migadu.com [IPv6:2001:41d0:203:375::b6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4grTFZ4GK4z2xC3 for ; Thu, 02 Jul 2026 17:35:45 +1000 (AEST) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1782977290; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cdXAMvaGTLXZ4tRHqX+15mFjqPO5NJv7/lbzInUeZeM=; b=UUw36nfQUDO4ek5W5MoGxv/bQdNbTQycY1qQKAEoJymjql+ZXc8a2FUo9eNrafl6xDrEni 1302Z8Y+Ma+0qxdUDhBISoxry5nus7uGAN8fTkB0ZcU/zUf+14Ol9iIljWhjg5Yh/mt933 8BhSh84bNWygA1To4TaXOltx56F5hgs= From: Lance Yang To: ljs@kernel.org Cc: akpm@linux-foundation.org, tsbogend@alpha.franken.de, maddy@linux.ibm.com, mpe@ellerman.id.au, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, l.stach@pengutronix.de, inki.dae@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, krzk@kernel.org, peter.griffin@linaro.org, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, tursulin@ursulin.net, robin.clark@oss.qualcomm.com, lumag@kernel.org, lyude@redhat.com, dakr@kernel.org, tomi.valkeinen@ideasonboard.com, hjc@rock-chips.com, heiko@sntech.de, andy.yan@rock-chips.com, thierry.reding@kernel.org, mperttunen@nvidia.com, jonathanh@nvidia.com, kraxel@redhat.com, dmitry.osipenko@collabora.com, zack.rusin@broadcom.com, matthew.brost@intel.com, thomas.hellstrom@linux.intel.com, oleksandr_andrushchenko@epam.com, deller@gmx.de, bcrl@kvack.org, viro@zeniv.linux.org.uk, brauner@kernel.org, muchun.song@linux.dev, osalvador@suse.de, david@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, hughd@google.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, kees@kernel.org, perex@perex.cz, tiwai@suse.com, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org, etnaviv@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-tegra@vger.kernel.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, xen-devel@lists.xenproject.org, linux-fbdev@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-sound@vger.kernel.org Subject: Re: [PATCH 01/13] mm: introduce vma_flags_can_grow() and vma_can_grow() Date: Thu, 2 Jul 2026 15:27:50 +0800 Message-Id: <20260702072750.45641-1-lance.yang@linux.dev> In-Reply-To: References: X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT On Mon, Jun 29, 2026 at 08:25:24PM +0100, Lorenzo Stoakes wrote: >These test whether the VMA has stack sematics, i.e. is able to grow upwards >or downwards depending on the architecture. > >In order to account for arches which do not support upward-growing stacks, >introduce VMA_GROWSUP whose definition depends on the architecture >supporting it, and use vma_flags_test_single_mask() in vma_flags_can_grow() >to account for this. > >Update the VMA userland tests to reflect the changes > >No functional change intended. > >Signed-off-by: Lorenzo Stoakes >--- Nice cleanup! Feel free to add: Reviewed-by: Lance Yang