From: Ingo Molnar <mingo@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jamie Lokier <jamie@shareable.org>,
ville.syrjala@linux.intel.com, Borislav Petkov <bp@alien8.de>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
linux-tip-commits@vger.kernel.org,
"H.J. Lu" <hjl.tools@gmail.com>
Subject: Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings
Date: Tue, 12 Feb 2013 09:10:28 +0100 [thread overview]
Message-ID: <20130212081028.GA19250@gmail.com> (raw)
In-Reply-To: <5119C34B.70207@zytor.com>
* H. Peter Anvin <hpa@zytor.com> wrote:
> On 02/11/2013 07:33 PM, Linus Torvalds wrote:
> > On Mon, Feb 11, 2013 at 5:37 PM, tip-bot for H. Peter Anvin
> > <hpa@zytor.com> wrote:
> >>
> >> However, we can declare a bitfield using sizeof(), which is legal
> >> because sizeof() is a constant expression. This quiets the warning,
> >> although the code generated isn't 100% identical from the baseline
> >> before 96477b4 x86-32: Add support for 64bit get_user():
> >
> > Christ. This is so ugly that it's almost a work of art.
>
> :)
A real possibility would be that if this ever breaks in a GCC
version, or generates some really crappy code, we might get a
"you got what you asked for" shrug from GCC developers?
It's not like we could start a revolution over that.
Thanks,
Ingo
next prev parent reply other threads:[~2013-02-12 8:10 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-12 11:34 [PATCH] x86: Add support for 64bit get_user() on x86-32 ville.syrjala
2012-12-12 16:15 ` H. Peter Anvin
2012-12-12 16:32 ` Ville Syrjälä
2012-12-12 16:45 ` H. Peter Anvin
2013-02-07 16:53 ` Ville Syrjälä
2013-02-07 17:59 ` H. Peter Anvin
2013-02-08 16:24 ` Ville Syrjälä
2013-02-08 17:30 ` H. Peter Anvin
2013-02-08 18:23 ` Ville Syrjälä
2013-02-08 19:08 ` H. Peter Anvin
2013-02-09 10:41 ` Borislav Petkov
2013-02-09 11:00 ` Russell King - ARM Linux
2013-02-12 1:37 ` [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings tip-bot for H. Peter Anvin
2013-02-12 3:33 ` Linus Torvalds
2013-02-12 4:21 ` H. Peter Anvin
2013-02-12 4:42 ` Linus Torvalds
2013-02-12 4:47 ` Linus Torvalds
2013-02-12 4:51 ` H. Peter Anvin
2013-02-12 7:12 ` H. Peter Anvin
2013-02-12 8:10 ` Ingo Molnar [this message]
2013-02-12 16:38 ` H.J. Lu
2013-02-12 17:00 ` Linus Torvalds
2013-02-12 17:14 ` H. Peter Anvin
2013-02-12 17:30 ` H.J. Lu
2013-02-12 18:25 ` H. Peter Anvin
2013-02-12 18:29 ` H.J. Lu
2013-02-12 18:46 ` Linus Torvalds
2013-02-12 18:58 ` H. Peter Anvin
2013-02-12 20:55 ` [tip:x86/mm] x86, mm: Redesign get_user with a __builtin_choose_expr hack tip-bot for H. Peter Anvin
2013-02-12 23:06 ` Linus Torvalds
2013-02-12 23:19 ` H. Peter Anvin
2013-02-12 23:49 ` Linus Torvalds
2013-02-12 23:52 ` H. Peter Anvin
2013-02-13 0:01 ` [tip:x86/mm] x86, doc: Clarify the use of asm("%edx") in uaccess.h tip-bot for H. Peter Anvin
2013-02-12 23:21 ` [tip:x86/mm] x86, mm: Redesign get_user with a __builtin_choose_expr hack Russell King - ARM Linux
2013-02-12 17:32 ` [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings Linus Torvalds
2013-02-12 17:35 ` H. Peter Anvin
2013-02-12 17:49 ` Linus Torvalds
2013-02-12 17:57 ` Russell King - ARM Linux
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