linux-kernel - Re: [PATCH v1] drivers:gt:Switch to use kmemdup

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Message-ID: <ZsRRUrNnveqU6bSV@ashyti-mobl2.lan>
Date: Tue, 20 Aug 2024 10:18:26 +0200
From: Andi Shyti <andi.shyti@...ux.intel.com>
To: Yu Jiaoliang <yujiaoliang@...o.com>
Cc: 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>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Matt Roper <matthew.d.roper@...el.com>,
	Andi Shyti <andi.shyti@...ux.intel.com>,
	Michal Mrozek <michal.mrozek@...el.com>,
	Gustavo Sousa <gustavo.sousa@...el.com>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Tejas Upadhyay <tejas.upadhyay@...el.com>,
	Shekhar Chauhan <shekhar.chauhan@...el.com>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, opensource.kernel@...o.com
Subject: Re: [PATCH v1] drivers:gt:Switch to use kmemdup_array()

Hi Yi,

Please, next time check with "git drivers/gpu/drm/i915/gt" to
better understand the patch formatting.

The title should be something like:

   drm/i915/gt: Switch to use kmemdup_array()

But sounds more grammatically correct

   drm/i915/gt: Use kmemdup_array instead of kmemdup for multiple allocation

On Tue, Aug 20, 2024 at 03:45:03PM +0800, Yu Jiaoliang wrote:
> Let the kememdup_array() take care about multiplication and possible
> overflows.

Leave one blank line between the commit log and the tag section

> Signed-off-by: Yu Jiaoliang <yujiaoliang@...o.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 09a287c1aedd..d90348c56765 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -111,8 +111,8 @@ static void wa_init_finish(struct i915_wa_list *wal)
>  {
>  	/* Trim unused entries. */
>  	if (!IS_ALIGNED(wal->count, WA_LIST_CHUNK)) {
> -		struct i915_wa *list = kmemdup(wal->list,
> -					       wal->count * sizeof(*list),
> +		struct i915_wa *list = kmemdup_array(wal->list,
> +					       wal->count, sizeof(*list),
>  					       GFP_KERNEL);

Here you are not aligning correctly. Everything should be aligned
to one character after the open parenthesis; for example:

		struct i915_wa *list = kmemdup_array(wal->list, wal->count,
						     sizeof(*list), GFP_KERNEL);

Patch is good, though looking forward to receiving v2.

Thanks,
Andi

>  
>  		if (list) {
> -- 
> 2.34.1