linux-kernel - Re: [PATCH] drm/i915: drop various VLAs in i915

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Date:   Wed, 14 Mar 2018 14:17:07 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Salvatore Mesoraca <s.mesoraca16@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kernel-hardening@...ts.openwall.com,
        David Airlie <airlied@...ux.ie>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Salvatore Mesoraca <s.mesoraca16@...il.com>
Subject: Re: [PATCH] drm/i915: drop various VLAs in i915_debugfs.c

On Tue, 13 Mar 2018, Salvatore Mesoraca <s.mesoraca16@...il.com> wrote:
> Avoid 3 VLAs[1] by using real constant expressions instead of variables.
> The compiler should be able to optimize the original code and avoid using
> any actual VLAs. Anyway this change is useful because it will avoid a false
> positives with -Wvla, it might also help the compiler generating better
> code.

Thanks for your patch. However, Chris beat you to it with:

7aa0b14ede64 ("drm/i915: Remove variable length arrays from sseu debugfs
printers")

as well as adding -Wvla to our subdir-ccflags-y to prevent more from
cropping up:

c5c2b11894f4 ("drm/i915: Warn against variable length arrays")


BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center