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Date:   Mon, 30 Jan 2023 21:52:00 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Ilya Dryomov <idryomov@gmail.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
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        Keith Busch <kbusch@kernel.org>,
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Subject: Re: [PATCH 01/23] block: factor out a bvec_set_page helper
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On Tue, 31 Jan 2023 05:28:19 +0000 Matthew Wilcox wrote:
> > I bet we can drop mm.h now.  It was originally added for nth_page()
> > in 3d75ca0adef4 but those were all removed by b8753433fc61.
> > 
> > A quick smoke test on my default testing config doesn't find any
> > problems.  Let me send a patch and see if the build bots complain.  
> 
> Disappointingly, it doesn't really change anything.  1134 files
> depend on mm.h both before and after [1].  Looks like it's due to
> arch/x86/include/asm/cacheflush.h pulling in linux/mm.h, judging by the
> contents of .build_test_kernel-x86_64/net/ipv6/.inet6_hashtables.o.cmd.
> But *lots* of header files pull in mm.h, including scatterlist.h,
> vt_kern.h, net.h, nfs_fs.h, sunrpc/svc.h and security.h.
> 
> I suppose it may cut down on include loops to drop it here, so I'm
> still in favour of the patch I posted, but this illustrates how
> deeply entangled our headers still are.

+1 it's a bit of a chicken and an egg problem. Until mm.h is gone 
from bvec there's no point removing other headers which pull it in 
to skbuff.h.