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SubjectRe: [PATCH v2 5/5] Input: evdev - Switch to bitmap_zalloc()
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On Sat, 2018-06-16 at 21:45 +0300, Andy Shevchenko wrote:
> On Sat, Jun 16, 2018 at 12:46 AM Yury Norov <ynorov@caviumnetworks.com> wrote:
> > On Fri, Jun 15, 2018 at 04:20:17PM +0300, Andy Shevchenko wrote:
> > > Switch to bitmap_zalloc() to show clearly what we are allocating.
> > > Besides that it returns pointer of bitmap type instead of opaque void *.
>
>
> > > + mem = bitmap_alloc(maxbit, GFP_KERNEL);
> > > if (!mem)
> > > return -ENOMEM;
> >
> > But in commit message you say you switch to bitmap_zalloc(). IIUC
> > bitmap_alloc() is OK here. But could you please update comment to
> > avoid confusing.
>
> There are two places, one with alloc, another with zalloc.
> I will clarify this in commit message of next version.
>
> > > + mask = bitmap_zalloc(cnt, GFP_KERNEL);
> > > if (!mask)
> > > return -ENOMEM;
> > >
> > > error = bits_from_user(mask, cnt - 1, codes_size, codes, compat);
> >
> > If my understanding of bits_from_user() correct, here you can also use
> > bitmap_alloc(), true?

Also it might be useful to have a separate bitmap_from_user
to alloc and copy.

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