linux-kernel - RE: [PATCHv2 2/3] iovmm: add superpages support to fixed da address

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Date:	Wed, 13 Oct 2010 19:43:50 +0300
From:	Felipe Contreras <felipe.contreras@...ia.com>
To:	fernando.lugo@...com, felipe.contreras@...il.com
Cc:	hiroshi.doyu@...ia.com, david.cohen@...ia.com,
	ameya.palande@...ia.com, linux-kernel@...r.kernel.org,
	andy.shevchenko@...il.com, linux-omap@...r.kernel.org
Subject: RE: [PATCHv2 2/3] iovmm: add superpages support to fixed da address

fernando.lugo@...com wrote:
> > On Mon, Oct 11, 2010 at 6:33 PM, Guzman Lugo, Fernando 
> > <fernando.lugo@...com> wrote:
> > >> > @@ -420,7 +431,8 @@ static void sgtable_fill_kmalloc(struct
> > >> sg_table
> > >> > *sgt, u32 pa, size_t len)
> > >> >        for_each_sg(sgt->sgl, sg, sgt->nents, i) {
> > >> >                size_t bytes;
> > >> >
> > >> > -               bytes = iopgsz_max(len);
> > >> > +               bytes = max_alignment(da | pa);
> > >> > +               bytes = min(bytes, (size_t)iopgsz_max(len));
> > >>
> > >> Why the size_t casting?
> > >
> > > To void this warning:
> > > arch/arm/plat-omap/iovmm.c:440: warning: comparison of distinct 
> > > pointer types lacks a cast
> > 
> > But how is that possible? iopgsz_max is returning constants, 
> > like SZ_1M, so they should not need casts, if anything, the 
> > cast should be done in iopgsz_max itself.
> 
> The min macro make a "typeof" of the parameter, so the typeof of a 
> Constants should be int I think and that's the reason of the warning.
> 
> I can use min_t instead to avoid the warning, something like this:
> 
> 			bytes = min_t(size_t, bytes, iopgsz_max(len));
> 
> What do you think?

Right, I forgot about that one... much better.

-- 
Felipe Contreras
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