RE: [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2

From: Chen, Kenneth W <>
Date: 2006-11-02 19:56:46
Mao, Bibo wrote on Wednesday, November 01, 2006 11:53 PM
> else means that current cpu does not support 16 byte atomic operation.
> If kprobe address is on slot 0/2, then memcpy still can execute.

Do you allow kprobe insertion on "L+X" instruction?  It looks like so.
Then how do you maintain atomic update to L and X instruction right
now with memcpy?

"atomic update" is not really the exact word I want to use here.  Don't
you want to write the upper 8-byte first so that break opcode is jammed
in there before updating the remaining 41-bit immediate value? Otherwise,
writing lower 8-byte first will end up with a small window that original
opcode seeing corrupted immediate value.

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Received on Thu Nov 02 19:56:58 2006

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