From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 AEF5534CFDE; Wed, 22 Jul 2026 13:34:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784727260; cv=none; b=THmg18ZynrrY/DdOWzCct4vkfrSZFUhOvU0TpbL0nNn27QIuDG/tc+44pHLo3AhTI5LvVHb1xI27oWIMe2MV+fH8X1PQuIwpVSb6SjkEfvWfnew73ST8XJivtPTBG+yX2DOwo3ZWbWtkaI34l6qKZd5Nb8Q0jXMuCikSr4gbcNk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784727260; c=relaxed/simple; bh=uYctUh44CY7wmwKelNOi55sZT7wKaC8vAy7dQEi4MM0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ElrvLnTcINLHWjA2YYJZZQg2H3+WA7i4iTerwfkiVQpbOPAZrQUGbPIkGSwJ6mx8OZYnbMtNNOq7I7v1vuvUhPEAmxi1ooX+ip6QHH39FOjY3QsuFxwgLrw5HOUT+lmMKwkjh99e1eVP1OjEPJxaQNIWsUBEK41bD4wVWpUdRMk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Xf2Qo7nf; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Xf2Qo7nf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D05801F000E9; Wed, 22 Jul 2026 13:33:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784727253; bh=DjW3IoJngeCa8GtjqJn2j2qE4s7NfPfHtuHffq4DmkI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Xf2Qo7nfk8o5oFsdnRyvwfFlDT+UNHYxpWkdWS9jpYlddyaBbeTmAt4TSKYjBQ6nC VQT5FSiqo8vVJq/R82X3RyjGnMFjVe2qzMcG3VgXV669ofkFC8DZnKS+UkWwrpzb6q Fi0Sx6sVMnRuvnBvyBvom3YRXCjGdDRHypbqW5x1R/Uji66gdMwF7l9mOVCq62z3nl gJr90z+D+N2GhFNNOkLY7sMLu7nS8Z2MkG2ZCFRrrGTu/B/Ym82LsdWUrflTm6uGaV oU9g4AgXa58RSoCWW8YaDO+USyZcemM+PmqZeWYEvuz91dURSvCpGTEaOa63HF+ZkH oAveIZpLt2mkA== Message-ID: <5d133def-b9ab-4c4a-8c37-3acd05841756@kernel.org> Date: Wed, 22 Jul 2026 15:33:53 +0200 Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/13] mm/vma: update do_mmap() to use vma_flags_t Content-Language: en-US To: Lorenzo Stoakes , Andrew Morton , David Hildenbrand , "Liam R. Howlett" , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Thomas Bogendoerfer , Benjamin LaHaise , Alexander Viro , Christian Brauner , Jan Kara , Hugh Dickins , Baolin Wang , Jann Horn , Pedro Falcato , Muchun Song , Oscar Salvador , Zi Yan , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Lucas Stach , Russell King , Christian Gmeiner , Inki Dae , Seung-Woo Kim , Kyungmin Park , Krzysztof Kozlowski , Peter Griffin , Alim Akhtar , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Lyude Paul , Danilo Krummrich , Tomi Valkeinen , Sandy Huang , =?UTF-8?Q?Heiko_St=C3=BCbner?= , Andy Yan , Thierry Reding , Mikko Perttunen , Jonathan Hunter , Gerd Hoffmann , Dmitry Osipenko , Gurchetan Singh , Chia-I Wu , Zack Rusin , Broadcom internal kernel review list , Matthew Brost , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , Oleksandr Andrushchenko , Helge Deller , Kees Cook , Jaroslav Kysela , Takashi Iwai , Boris Brezillon , Steven Price , Liviu Dudau Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org, etnaviv@lists.freedesktop.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-sound@vger.kernel.org References: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org> <20260711-b4-vma-flags-mm-v2-2-0fa2357d5431@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/11/26 20:44, Lorenzo Stoakes wrote: > The core do_mmap() function accepts a vm_flags_t parameter which it then > manipulates before passing to mmap_region() to do the heavy lifting of the > memory mapping. > > Update do_mmap() to instead accept a vma_flags_t parameter, and adjust all > the logic within do_mmap() to manipulate this instead. > > This is as part of the ongoing effort to convert VMA flags from a system > word size to a bitmap type which allows us to unrestrict the number of VMA > flags, as well as gain control over how VMA flag manipulation occurs. > > We do not cascade these changes to all functions which accept vm_flags_t, > but rather use vma_flags_to_legacy() where necessary, specifically > deferring converting calc_vm_prot_bits(), calc_vm_flag_bits() and > __get_unmapped_area() to vma_flags_t. > > Also utilise the new vma_flags_can_grow() predicate which correctly handles > the case of architectures without upward growing stacks. > > As part of this change, introduce VMA_SHADOW_STACK so we can correctly > handle the case of the shadow stack not being defined. > > No functional change intended. > > Reviewed-by: Lance Yang > Reviewed-by: Zi Yan > Signed-off-by: Lorenzo Stoakes Reviewed-by: Vlastimil Babka (SUSE)