Re: cmpxchg and x86 flags output

From	"H. Peter Anvin" <hpa@zytor.com>
Newsgroups	linux.kernel
Subject	Re: cmpxchg and x86 flags output
Date	2016-08-19 19:30 +0200
Message-ID	<s7VMd-8wb-5@gated-at.bofh.it> (permalink)
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On 06/22/16 09:14, David Howells wrote:
> H. Peter Anvin <hpa@zytor.com> wrote:
> 
>> So how do we make this move forward?
> 
> Getting my API additions in is relatively straightforward, I think.  The
> whether-or-notness of the cmpxchg operation succeeding can be calculated by
> comparing the original value read from memory with the value-to-be-replaced
> inside the API function.
> 
> This can later be replaced with the boolean output from the CMPXCHG
> instruction, the branch target from the LL/SC skipping or the result of the
> intrinsics.
> 

Hi David,

Any news on this?  Can we perhaps help making this go forward at some point?

	-hpa

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Re: cmpxchg and x86 flags output "H. Peter Anvin" <hpa@zytor.com> - 2016-08-19 19:30 +0200
  Re: cmpxchg and x86 flags output David Howells <dhowells@redhat.com> - 2016-08-22 17:20 +0200

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