linux-kernel - Re: [PATCH V2 03/17] asm-generic: fcntl: compat: Remove duplicate definitions

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Message-ID: <YdxfGMDJh2ZVq8jc@infradead.org>
Date:   Mon, 10 Jan 2022 08:30:16 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Guo Ren <guoren@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
        Anup Patel <anup.patel@....com>,
        gregkh <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        Christoph Hellwig <hch@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        inux-parisc@...r.kernel.org,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH V2 03/17] asm-generic: fcntl: compat: Remove duplicate
 definitions

On Mon, Jan 10, 2022 at 02:35:19PM +0100, Arnd Bergmann wrote:
> > +#if !defined(CONFIG_64BIT) || defined(CONFIG_COMPAT)
> >  #ifndef F_GETLK64
> >  #define F_GETLK64      12      /*  using 'struct flock64' */
> >  #define F_SETLK64      13
> 
> The problem here is that include/uapi/ headers cannot contain checks for
> CONFIG_* symbols because those may have different meanings in user space
> compared to kernel.
> 
> This is a preexisting problem in the header, but I think the change
> makes it worse.

FYI, this is what I did in my old branch, which also sidesteps the
duplicate value problem on parisc. The rebase is untested so far,
but I can spend some cycles on finishing it:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fcntl-asm-generic-cleanup