On Wed, Sep 24, 2014 at 10:32:13PM +0300, Mikko Perttunen wrote:
> On 09/24/2014 10:18 PM, Eduardo Valentin wrote:
> >
> >Mikko,
> >
> >On Thu, Aug 21, 2014 at 01:17:22PM +0300, Mikko Perttunen wrote:
> >>...
> >>+
> >>+static int enable_tsensor(struct tegra_soctherm *tegra,
> >>+ const struct tegra_tsensor *sensor,
> >>+ struct tsensor_shared_calibration shared)
> >>+{
> >>+ void * __iomem base = tegra->regs + sensor->base;
> >
> >I get sparse complaining about this declaration. For the sake of keeping
> >a clean static checks, can you please:
> >- void * __iomem base = tegra->regs + sensor->base;
> >+ void __iomem * base = tegra->regs + sensor->base;
> >
>
> Sure.
>
> >Can you also please check the remaining sparse errors?
> > CHECK drivers/thermal/tegra_soctherm.c
> > drivers/thermal/tegra_soctherm.c:260:43: warning: incorrect type in
> > initializer (different address spaces)
> > drivers/thermal/tegra_soctherm.c:260:43: expected void *[noderef]
> > <asn:2>base
> > drivers/thermal/tegra_soctherm.c:260:43: got void [noderef]
> > <asn:2>*
> > drivers/thermal/tegra_soctherm.c:271:9: warning: incorrect type in
> > argument 2 (different address spaces)
> > drivers/thermal/tegra_soctherm.c:271:9: expected void volatile
> > [noderef] <asn:2>*addr
> > drivers/thermal/tegra_soctherm.c:271:9: got void *
> > drivers/thermal/tegra_soctherm.c:279:9: warning: incorrect type in
> > argument 2 (different address spaces)
> > drivers/thermal/tegra_soctherm.c:279:9: expected void volatile
> > [noderef] <asn:2>*addr
> > drivers/thermal/tegra_soctherm.c:279:9: got void *
> > drivers/thermal/tegra_soctherm.c:281:9: warning: incorrect type in
> > argument 2 (different address spaces)
> > drivers/thermal/tegra_soctherm.c:281:9: expected void volatile
> > [noderef] <asn:2>*addr
> > drivers/thermal/tegra_soctherm.c:281:9: got void *
> > drivers/thermal/tegra_soctherm.c:347:25: warning: incorrect type in
> > argument 1 (different address spaces)
> > drivers/thermal/tegra_soctherm.c:347:25: expected void const *ptr
> > drivers/thermal/tegra_soctherm.c:347:25: got void [noderef]
> > <asn:2>*regs
> > drivers/thermal/tegra_soctherm.c:349:37: warning: incorrect type in
> > argument 1 (different address spaces)
> > drivers/thermal/tegra_soctherm.c:349:37: expected void const *ptr
> > drivers/thermal/tegra_soctherm.c:349:37: got void [noderef]
> > <asn:2>*regs
> > drivers/thermal/tegra_soctherm.c:271:9: warning: dereference of
> > noderef expression
> > drivers/thermal/tegra_soctherm.c:279:9: warning: dereference of
> > noderef expression
> > drivers/thermal/tegra_soctherm.c:281:9: warning: dereference of
> > noderef expression
> >
>
> Most of these seem to be caused by the above-mentioned swapping of __iomem
> and *. The ones on lines 347 and 349 are more peculiar, though. Apparently
> sparse doesn't like using IS_ERR and PTR_ERR on the void __iomem * pointer
> returned by devm_ioremap_resource. Looks like this has been discussed before
> (https://lkml.org/lkml/2013/6/17/216) and sparse should have been patched to
> ignore this situation, so I'm not sure why it's complaining about it.
> Anyway, there shouldn't be any issue here.
If I apply the change suggested by Eduardo above then all of the above
warnings go away for me. That's with sparse 0.5.0. According to the
email thread above a patch for this was applied in 0.4.5.
Thierry
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