linux-kernel - Re: [PATCH 1/2] drm: replace drm_[cm]alloc* by kvmalloc alternatives

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Date:   Wed, 17 May 2017 11:23:44 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>
Subject: Re: [PATCH 1/2] drm: replace drm_[cm]alloc* by kvmalloc alternatives

On Wed 17-05-17 10:12:41, Chris Wilson wrote:
> On Wed, May 17, 2017 at 11:03:50AM +0200, Michal Hocko wrote:
[...]
> > +static inline bool alloc_array_check(size_t n, size_t size)
> > +{
> > +	if (size != 0 && n > SIZE_MAX / size)
> > +		return false;
> > +	return true;
> 
> Just return size == 0 || n <= SIZE_MAX /size ?
> 
> Whether or not size being 0 makes for a sane user is another question.
> The guideline is that size is the known constant from sizeof() or
> whatever and n is the variable number to allocate.
> 
> But yes, that inline is what I want :)

I will think about this. Maybe it will help to simplify/unify some other
users. Do you have any pointers to save me some grepping...?

-- 
Michal Hocko
SUSE Labs