Re: [PATCH 1/2] sysfs: Invoke iomem_get_mapping() from the sysfs open callback

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On Mon, Jun 28, 2021 at 3:12 AM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>
> On Fri, Jun 25, 2021 at 11:31:17PM +0000, Krzysztof Wilczy??ski wrote:
> >       if (battr->mapping)
> > -             of->file->f_mapping = battr->mapping;
> > +             of->file->f_mapping = battr->mapping();
>
> I think get_mapping() is a better name now.  That being said this
> whole programming model looks a little weird.

I think both those points are fair.

> Also, does this patch imply the mapping field of the sysfs bin
> attributes wasn't used before at all?

It defaulted to an address_space per file rather than a shared address
space across all files that map physical addresses as file offsets.



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