Re: [PATCH 20/23] rxrpc: use bvec_set_page to initialize a bvec

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Christoph Hellwig <hch@xxxxxx> wrote:

> On Mon, Jan 30, 2023 at 10:31:23AM +0000, David Howells wrote:
> > Christoph Hellwig <hch@xxxxxx> wrote:
> > 
> > > +		bvec_set_page(&bv, ZERO_PAGE(0), len, 0);
> > 
> > Maybe bvec_set_zero_page()?
> Why?

Seems to be something people want to do quite a lot and don't know about.
I've seen places where someone allocates a buffer and clears it just to use as
a source of zeros.  There's at least one place in cifs, for example.  I know
about it from wrangling arch code, but most people working on Linux haven't
done that.


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