Re: [PATCH][RFC] getting rid of stupid loop in BUG()

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From: Al Viro

Subject: Re: [PATCH][RFC] getting rid of stupid loop in BUG()

Date: Wednesday, July 25, 2007 - 10:36 am

On Wed, Jul 25, 2007 at 09:56:12AM -0700, Linus Torvalds wrote:
quoted text> We don't just do the "ud2" instruction - we also do the file and line 
> number information after it. Which means that __builtin_trap() is useless.
> 
> So we might as well keep the loop, since both are two-byte instructions 
> that tell gcc that it will never continue.

Actually, the worse problem is that gcc will happily merge these guys.
And that's a killer.
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Messages in current thread:

[PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Tue Jul 24, 8:39 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Tue Jul 24, 9:56 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Tue Jul 24, 10:03 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Tue Jul 24, 10:14 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Tue Jul 24, 10:28 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Tue Jul 24, 11:58 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Tue Jul 24, 12:01 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Tue Jul 24, 12:13 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Tue Jul 24, 1:04 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Tue Jul 24, 2:14 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Trent Piepho, (Tue Jul 24, 7:31 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG() , Keith Owens, (Tue Jul 24, 7:50 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Tue Jul 24, 10:09 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Tue Jul 24, 11:24 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), David Miller, (Tue Jul 24, 11:29 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Heiko Carstens, (Tue Jul 24, 11:50 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Linus Torvalds, (Wed Jul 25, 9:56 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Wed Jul 25, 10:00 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Wed Jul 25, 10:03 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Linus Torvalds, (Wed Jul 25, 10:19 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Wed Jul 25, 10:19 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Wed Jul 25, 10:22 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Wed Jul 25, 10:25 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Wed Jul 25, 10:26 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), David Howells, (Wed Jul 25, 10:35 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Al Viro, (Wed Jul 25, 10:36 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Wed Jul 25, 10:36 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Wed Jul 25, 10:41 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Jeremy Fitzhardinge, (Wed Jul 25, 10:44 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Linus Torvalds, (Wed Jul 25, 11:24 am)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), David Miller, (Wed Jul 25, 12:28 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), David Miller, (Wed Jul 25, 12:35 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Wed Jul 25, 1:26 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), Chuck Ebbert, (Wed Jul 25, 1:29 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), H. Peter Anvin, (Wed Jul 25, 1:37 pm)

Re: [PATCH][RFC] getting rid of stupid loop in BUG(), David Miller, (Wed Jul 25, 3:01 pm)