linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915/mtl: avoid stringop-overflow warning

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Date:   Tue, 17 Oct 2023 00:10:49 +0200
From:   Andi Shyti <andi.shyti@...ux.intel.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Badal Nilawar <badal.nilawar@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Arnd Bergmann <arnd@...db.de>, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Matt Roper <matthew.d.roper@...el.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/mtl: avoid stringop-overflow warning

Hi Arnd,

>  static void rc6_res_reg_init(struct intel_rc6 *rc6)
>  {
> -	memset(rc6->res_reg, INVALID_MMIO_REG.reg, sizeof(rc6->res_reg));

This is a complex initialization, indeed... how about just

   memset(rc6->res_reg, 0, sizeof(rc6->res_reg));

> +	i915_reg_t res_reg[INTEL_RC6_RES_MAX] = {
> +		[0 ... INTEL_RC6_RES_MAX - 1] = INVALID_MMIO_REG,
> +	};

This is basically a

   i915_reg_t res_reg[INTEL_RC6_RES_MAX] = { };

Don't know which one is clearer.

Andi