From: Christoph Hellwig <hch@lst.de>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@lst.de>, Guo Ren <guoren@kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
Parisc List <linux-parisc@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-s390 <linux-s390@vger.kernel.org>,
sparclinux <sparclinux@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Jeff Layton <jlayton@kernel.org>,
"J. Bruce Fields" <bfields@fieldses.org>
Subject: Re: [PATCH 4/5] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h
Date: Wed, 12 Jan 2022 08:56:09 +0100 [thread overview]
Message-ID: <20220112075609.GA4854@lst.de> (raw)
In-Reply-To: <CAK8P3a0mHC5=OOGV=sGnC9JqZWxzsJyZbTefnCtryQU3o3PY_g@mail.gmail.com>
On Tue, Jan 11, 2022 at 04:33:30PM +0100, Arnd Bergmann wrote:
> This is a very subtle change to the exported UAPI header contents:
> On 64-bit architectures, the three unusable numbers are now always
> shown, rather than depending on a user-controlled symbol.
Well, the change is bigger and less subtle. Before this change the
constants were never visible to userspace at all (except on mips),
because the #ifdef CONFIG_64BIT it never set for userspace builds.
> This is probably what we want here for compatibility reasons, but I think
> it should be explained in the changelog text, and I'd like Jeff or Bruce
> to comment on it as well: the alternative here would be to make the
> uapi definition depend on __BITS_PER_LONG==32, which is
> technically the right thing to do but more a of a change.
I can change this to #if __BITS_PER_LONG==32 || defined(__KERNEL__),
but it will still be change in what userspace sees.
next prev parent reply other threads:[~2022-01-12 7:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-11 8:35 consolidate the compat fcntl definitions Christoph Hellwig
2022-01-11 8:35 ` [PATCH 1/5] uapi: remove the unused HAVE_ARCH_STRUCT_FLOCK64 define Christoph Hellwig
2022-01-11 8:35 ` [PATCH 2/5] uapi: simplify __ARCH_FLOCK{,64}_PAD a little Christoph Hellwig
2022-01-11 8:35 ` [PATCH 3/5] uapi: merge the 32-bit mips struct flock into the generic one Christoph Hellwig
2022-01-11 8:35 ` [PATCH 4/5] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h Christoph Hellwig
2022-01-11 15:33 ` Arnd Bergmann
2022-01-12 2:08 ` Guo Ren
2022-01-12 7:56 ` Christoph Hellwig [this message]
2022-01-12 8:28 ` Arnd Bergmann
2022-01-12 11:15 ` Jeff Layton
2022-01-12 12:08 ` Arnd Bergmann
2022-01-12 16:09 ` Christoph Hellwig
2022-01-11 8:35 ` [PATCH 5/5] compat: consolidate the compat_flock{,64} definition Christoph Hellwig
2022-01-11 9:52 ` David Laight
2022-01-11 15:46 ` consolidate the compat fcntl definitions Arnd Bergmann
2022-01-12 9:56 ` Sergey Shtylyov
-- strict thread matches above, loose matches on Subject: below --
2022-01-31 6:49 consolidate the compat fcntl definitions v2 Christoph Hellwig
2022-01-31 6:49 ` [PATCH 4/5] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h Christoph Hellwig
2022-01-31 13:38 ` Guo Ren
2022-02-01 3:02 ` Guo Ren
2022-02-01 3:07 ` Guo Ren
2021-04-12 8:55 consolidate the flock uapi definitions Christoph Hellwig
2021-04-12 8:55 ` [PATCH 4/5] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h Christoph Hellwig
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