Messages in this thread |  | | | Date | Sat, 16 Aug 2008 08:04:23 -0700 | | From | "H. Peter Anvin" <> | | Subject | Re: [PATCH] x86_64 : support atomic ops with 64 bits integer values |
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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.
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