linux-kernel - Re: [RFC 3/3] headers: repurpose linux/fs

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Date:   Wed, 8 Dec 2021 11:10:26 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        kernel test robot <lkp@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tejun Heo <tj@...nel.org>, kernelci@...ups.io,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        llvm@...ts.linux.dev
Subject: Re: [RFC 3/3] headers: repurpose linux/fs_types.h

On Wed, Dec 8, 2021 at 11:05 AM Christian Brauner
<christian.brauner@...ntu.com> wrote:
>
> On Tue, Dec 07, 2021 at 04:09:27PM +0100, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > linux/fs_types.h traditionally describes the types of file systems we
> > deal with, but the file name could also be interpreted to refer to
> > data types used for interacting with file systems, similar to
> > linux/spinlock_types.h or linux/mm_types.h.
> >
> > Splitting out the data type definitions from the generic header helps
> > avoid excessive indirect include hierarchies, so steal this file
> > name and repurpose it to contain the definitions for file, inode,
> > address_space, super_block, file_lock, quota and filename, along with
> > their respective callback operations, moving them out of linux/fs.h.
> >
> > The preprocessed linux/fs_types.h is now about 50KB, compared to
> > over 1MB for the traditional linux/fs.h, and can be included from
> > most other headers that currently rely on type definitions from
> > linux/fs.h.
> >
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
>
> I tried to apply the series to take a closer look but it fails to apply
> cleanup down to v5.15 and any release after that. What's the base I
> should use for this?

It is based on yesterday's linux-next plus additional patches I used
for testing. Sorry about the extra troubles, but this was the most
convenient way for me, as it lets me find build regressions in random
configs more easily when I have a base tree that builds randconfig
warning-free.

The patches are at the top of my randconfig tree [1] at the moment,
so you can try out that tree, or rebase the patches from there.

        Arnd

[1] https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/log/?h=randconfig-5.17-next