Re: [PATCH] x86_64 : support atomic ops with 64 bits integer values

[H. Peter Anvin]

Mathieu Desnoyers wrote:
> x86_64 add/sub atomic ops does not seems to accept integer values bigger
> than 32 bits as immediates. Intel's add/sub documentation specifies they
> have to be passed as registers.

This is correct; this is in fact true for all instructions except "mov".

Whether it's sign- or zero-extending is sometimes subtle, but not in 
these cases.

Do you happen to know if this is a manifest bug in the current kernel 
(i.e. if there is anywhere we're using more than ±2 GB as a constant to 
these functions?)

Either way, I'll queue this up to tip:x86/urgent if Ingo hasn't already 
since this is a pure bug fix.

	-hpa
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