From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H.J. Lu" <hjl.tools@gmail.com>, Ingo Molnar <mingo@kernel.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
Subject: Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings
Date: Tue, 12 Feb 2013 09:35:12 -0800 [thread overview]
Message-ID: <511A7D50.9090804@zytor.com> (raw)
In-Reply-To: <CA+55aFz=OnntmRvi6geuL7ccC6ncwQ7NvURDcwu87BkpS3H0TQ@mail.gmail.com>
On 02/12/2013 09:32 AM, Linus Torvalds wrote:
> On Tue, Feb 12, 2013 at 9:14 AM, H. Peter Anvin <hpa@zytor.com> wrote:
>>
>> No, I think what he is talking about it this bit:
>
> Ok, I agree that the bitfield code actually looks cleaner.
>
> That said, maybe gcc has an easier time using a few odd builtins and
> magic typeof's. But at least the bitfield trick looks half-way
> portable..
>
On the other hand, it still uses two gcc extensions: long long bitfields
and typeof.
I'll see what kind of code we get with the macro.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2013-02-12 17:35 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
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 [this message]
2013-02-12 17:49 ` Linus Torvalds
2013-02-12 17:57 ` Russell King - ARM Linux
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=511A7D50.9090804@zytor.com \
--to=hpa@zytor.com \
--cc=bp@alien8.de \
--cc=hjl.tools@gmail.com \
--cc=jamie@shareable.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=mingo@kernel.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=ville.syrjala@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.