From: Linus Torvalds <torvalds@linux-foundation.org>
To: "H. Peter Anvin" <hpa@zytor.com>
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 09:49:30 -0800 [thread overview]
Message-ID: <CA+55aFxTnLbT7yjxzP8_eAXV-YDFMgSu-6Op-Hr3aDhAw_S=BQ@mail.gmail.com> (raw)
In-Reply-To: <511A7D50.9090804@zytor.com>
On Tue, Feb 12, 2013 at 9:35 AM, H. Peter Anvin <hpa@zytor.com> wrote:
>
> 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.
At least one thing to look out for is the poor LLVM people who are
trying to make the kernel compile with that compiler.. We shouldn't
make it arbitrarily harder for them, so *some* level of portability is
a good idea.
Then there is icc, but I don't know how relevant that would ever be.
At least LLVM has the potential to be widely available.
Of course, they may both already support even the odd gcc builtins -
we already use a lot of the more straightforward ones...
Linus
next prev parent reply other threads:[~2013-02-12 17:49 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
2013-02-12 17:49 ` Linus Torvalds [this message]
2013-02-12 17:57 ` Russell King - ARM Linux
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