Re: Is gcc thread-unsafe?

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To: Nick Piggin <nickpiggin@...>
Cc: Linux Kernel Mailing List <linux-kernel@...>, Linus Torvalds <torvalds@...>
Date: Thursday, October 25, 2007 - 7:55 pm

> But we don't actually know what it is, and it could change with

I don't think it makes sense for memory. It may may make sense for registers.

But given that my kernel doesn't seem to contain any instances
at all it's probably not too useful for it anyways.

So I wouldn't have a problem disabling it, but it would
be better if they fixed their heuristics to only apply it when
it makes sense. 

Unfortunately it's not possible as far as I know with current gccs.
I didn't think you can disable only ADC/SBB.

Disabling all of CMOV would be a pity though. Also I don't think
there is any way to do that except selecting a CPU architecture
that doesn't support it which would have other bad side effects
on the code.

-Andi
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Messages in current thread:
Is gcc thread-unsafe?, Nick Piggin, (Wed Oct 24, 11:24 pm)
Re: Is gcc thread-unsafe?, Phillip Susi, (Wed Oct 31, 6:10 pm)
Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 10:55 am)
Re: Is gcc thread-unsafe?, Ismail , (Thu Oct 25, 6:26 pm)
Re: Is gcc thread-unsafe?, Jeff Garzik, (Thu Oct 25, 6:56 pm)
Re: Is gcc thread-unsafe?, Jeff Garzik, (Thu Oct 25, 7:04 pm)
RE: Is gcc thread-unsafe?, David Schwartz, (Thu Oct 25, 5:42 pm)
Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 7:22 pm)
Re: Is gcc thread-unsafe?, Andrew Haley, (Fri Oct 26, 7:59 am)
Re: Is gcc thread-unsafe?, Andrew Haley, (Fri Oct 26, 7:59 am)
Re: Is gcc thread-unsafe?, Chris Friesen, (Fri Oct 26, 1:39 pm)
Re: Is gcc thread-unsafe?, Pekka Enberg, (Thu Oct 25, 11:12 am)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 3:15 am)
Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 6:49 pm)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:09 pm)
Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 7:43 pm)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:55 pm)
Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 7:57 pm)
Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 7:14 pm)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:16 pm)
Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 7:32 pm)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 7:42 pm)
Re: Is gcc thread-unsafe?, Willy Tarreau, (Fri Oct 26, 12:57 am)
Re: Is gcc thread-unsafe?, Linus Torvalds, (Thu Oct 25, 7:57 pm)
Re: Is gcc thread-unsafe?, Zachary Amsden, (Thu Oct 25, 9:15 pm)
Re: Is gcc thread-unsafe?, linux-os (Dick Johnson), (Thu Oct 25, 7:58 am)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 8:16 am)
Re: Is gcc thread-unsafe?, Arjan van de Ven, (Wed Oct 24, 11:46 pm)
Re: Is gcc thread-unsafe?, Nick Piggin, (Wed Oct 24, 11:58 pm)
RE: Is gcc thread-unsafe?, David Schwartz, (Thu Oct 25, 12:29 am)
Re: Is gcc thread-unsafe?, Nick Piggin, (Thu Oct 25, 12:47 am)
Re: Is gcc thread-unsafe?, Samuel Tardieu, (Thu Oct 25, 5:44 am)
Re: Is gcc thread-unsafe?, Andi Kleen, (Thu Oct 25, 5:55 am)
Re: Is gcc thread-unsafe?, Arjan van de Ven, (Thu Oct 25, 12:35 am)