From: "H. Peter Anvin" <hpa@zytor.com>
To: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 -tip 0/4] x86: signal handler improvement
Date: Thu, 25 Sep 2008 11:14:49 -0700 [thread overview]
Message-ID: <48DBD519.6030204@zytor.com> (raw)
In-Reply-To: <48DBD396.5020103@ct.jp.nec.com>
Hiroshi Shimamoto wrote:
>
> and errors in __put_user is stored to stack.
> At the end of function, all errors in stack are calculated. If access to user
> space is failed, %edx is set to -EFAULT in exception handler and stored to
> stack for later operation.
> It seems inefficient.
>
This is a gcc failure, and should be reported to the gcc people.
-hpa
next prev parent reply other threads:[~2008-09-25 18:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-25 18:08 [RFC PATCH v2 -tip 0/4] x86: signal handler improvement Hiroshi Shimamoto
2008-09-25 18:14 ` H. Peter Anvin [this message]
2008-09-25 18:29 ` Hiroshi Shimamoto
2008-09-25 18:33 ` H. Peter Anvin
2008-09-25 19:38 ` Hiroshi Shimamoto
2008-09-27 17:11 ` Ingo Molnar
2008-09-25 18:18 ` [RFC PATCH v2 -tip 1/4] x86: uaccess: rename __put_user_u64 to __put_user_asm_u64 Hiroshi Shimamoto
2008-09-25 18:18 ` [RFC PATCH v2 -tip 2/4] x86: uaccess: introduce __{put|get}_user_asm_eop Hiroshi Shimamoto
2008-09-25 18:18 ` [RFC PATCH v2 -tip 3/4] x86: uaccess: introduce __{put|get}_user_cerr Hiroshi Shimamoto
2008-09-25 18:18 ` [RFC PATCH v2 -tip 4/4] x86: signal: use __{put|get}_user_cerr Hiroshi Shimamoto
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