From: Andreas Schwab <schwab@linux-m68k.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Christoph Hellwig <hch@infradead.org>,
Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>,
Vitaly Mayatskikh <v.mayatskih@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Roland McGrath <roland@redhat.com>,
linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Q: put_user_try & co (Was: [PATCH 1/5] Split wait_noreap_copyout())
Date: Wed, 20 May 2009 23:14:25 +0200 [thread overview]
Message-ID: <m2my97wk7i.fsf@igel.home> (raw)
In-Reply-To: <20090520190312.GA32333@redhat.com> (Oleg Nesterov's message of "Wed, 20 May 2009 21:03:12 +0200")
Oleg Nesterov <oleg@redhat.com> writes:
> Pseudo-code:
>
> #define put_user_try \
> do { \
> __label__ __efault_label; \
>
>
> #define put_user_catch(err) \
> err = 0; \
> if (0) { \
> __efault_label: \
> err = -EFAULT; \
> } \
> while (0)
>
>
> #define __put_user_asm_ex(...) \
> asm volatile( \
> "1: mov ..." \
> _ASM_EXTABLE(1b, &__efault_label) \
> : : ...)
The address of local labels can only be used in connection with computed
gotos, otherwise you get unspecified results.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2009-05-20 21:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-11 10:12 [PATCH 0/5] wait_task_* cleanups Vitaly Mayatskikh
2009-05-11 10:12 ` [PATCH 1/5] Split wait_noreap_copyout() Vitaly Mayatskikh
2009-05-11 10:20 ` Ingo Molnar
2009-05-11 11:20 ` Vitaly Mayatskikh
2009-05-11 12:04 ` Christoph Hellwig
2009-05-11 12:17 ` Ingo Molnar
2009-05-11 20:47 ` Vitaly Mayatskikh
2009-05-11 21:04 ` Ingo Molnar
2009-05-20 19:03 ` Q: put_user_try & co (Was: [PATCH 1/5] Split wait_noreap_copyout()) Oleg Nesterov
2009-05-20 20:11 ` Roland McGrath
2009-05-20 20:56 ` H. Peter Anvin
2009-05-21 13:42 ` Oleg Nesterov
2009-05-20 21:14 ` Andreas Schwab [this message]
2009-05-11 12:17 ` [PATCH 1/5] Split wait_noreap_copyout() Vitaly Mayatskikh
2009-05-11 10:12 ` [PATCH 2/5] Use wait_copyout() in wait_task_stopped() Vitaly Mayatskikh
2009-05-11 10:12 ` [PATCH 3/5] Use wait_copyout() in do_wait() Vitaly Mayatskikh
2009-05-11 10:12 ` [PATCH 4/5] Use wait_copyout() in wait_task_zombie() Vitaly Mayatskikh
2009-05-11 10:12 ` [PATCH 5/5] Use wait_copyout() in wait_task_continued() Vitaly Mayatskikh
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