netdev - Re: [PATCH 20/23] rxrpc: use bvec_set

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Message-ID: <20230130121820.GA18981@lst.de>
Date:   Mon, 30 Jan 2023 13:18:20 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Howells <dhowells@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, linux-block@...r.kernel.org,
        ceph-devel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        devel@...ts.orangefs.org, io-uring@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 20/23] rxrpc: use bvec_set_page to initialize a bvec

On Mon, Jan 30, 2023 at 11:24:15AM +0000, David Howells wrote:
> Seems to be something people want to do quite a lot and don't know about.

Hmm.  Right now there is one case where it would be used, and there's
about three that are and should be using bio_add_page.

> 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.

But we don't really need a helper for every possible page use for that.
People just need to learn about ZERO_PAGE.