linux-kernel - Re: [PATCH v3 01/10] drm/shmem-helper: Add huge page fault handler

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Message-ID: <aOGlgz3E3kzK1_BH@casper.infradead.org>
Date: Sat, 4 Oct 2025 23:53:55 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Loïc Molinari <loic.molinari@...labora.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>, Melissa Wen <mwen@...lia.com>,
	Maíra Canal <mcanal@...lia.com>,
	Hugh Dickins <hughd@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Mikołaj Wasiak <mikolaj.wasiak@...el.com>,
	Christian Brauner <brauner@...nel.org>,
	Nitin Gote <nitin.r.gote@...el.com>,
	Andi Shyti <andi.shyti@...ux.intel.com>,
	Christopher Healy <healych@...zon.com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, linux-mm@...ck.org,
	kernel@...labora.com, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v3 01/10] drm/shmem-helper: Add huge page fault handler

On Sat, Oct 04, 2025 at 11:30:44AM +0200, Loïc Molinari wrote:
> -static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
> +static vm_fault_t drm_gem_shmem_huge_fault(struct vm_fault *vmf,
> +					   unsigned int order)

>From the mm side, we'd much rather you implemented ->map_pages than
->huge_fault.  It's far more flexible; for example it'll support ARM's
contpte which ->huge_fault() doesn't.