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Date:	Mon, 11 Aug 2014 08:13:17 -0700
From:	"H. Peter Anvin" <>
To:	Jan Beulich <>
CC:	Andy Lutomirski <>,
	Kees Cook <>,
	Will Drewry <>,
	Frederic Weisbecker <>,
	Denys Vlasenko <>,
	X86 ML <>, Alexei Starovoitov <>,
	Denys Vlasenko <>,
	Oleg Nesterov <>,
	Linux Kernel Mailing List <>
Subject: Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct

On 08/11/2014 08:08 AM, Jan Beulich wrote:
>> No, in *human language*.  What does the DW_CFA_def_cfa_expression
>> actually aim to accomplish?  If you don't know the innards of the DWARF
>> spec, the whole thing might as well be Hungarian.
> Just like the other DW_CFA_def_cfa_* ones it sets the current
> frame address (CFA), just not via one of the pre-canned shortcuts,
> but via an expression (in the case here de-referencing the stack
> pointer to read the top of stack, and then adding the necessary
> offset). So it indeed is similar enough to other .cfi_* annotations we
> use without further comments.

Actually, what you had inside the parenteses there is actually a
half-decent comment.  I'm going to pretend the rest of this wasn't posted.


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