linux-kernel - Re: [PATCH v3 03/10] drm/gem: Add huge tmpfs mount point helper

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Message-ID: <20251004203402.GC2441659@ZenIV>
Date: Sat, 4 Oct 2025 21:34:02 +0100
From: Al Viro <viro@...iv.linux.org.uk>
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>,
	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
Subject: Re: [PATCH v3 03/10] drm/gem: Add huge tmpfs mount point helper

On Sat, Oct 04, 2025 at 11:30:46AM +0200, Loïc Molinari wrote:

> +static int drm_gem_add_fc_param(struct fs_context *fc, const char *key,
> +				const char *value)
> +{
> +	return vfs_parse_fs_string(fc, key, value, strlen(value));
> +}

Documentation/filesystems/porting.rst:
 
**mandatory**
  
Calling conventions for vfs_parse_fs_string() have changed; it does *not*
take length anymore (value ? strlen(value) : 0 is used).  If you want
a different length, use
   
	vfs_parse_fs_qstr(fc, key, &QSTR_LEN(value, len))
	    
instead.

IOW, your drm_gem_add_fc_param(fc, key, value) is an exact equivalent
of vfs_parse_fs_string(fc, key, value) now.