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Date: Mon, 11 Aug 2014 08:13:17 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Jan Beulich <JBeulich@...e.com> CC: Andy Lutomirski <luto@...capital.net>, Kees Cook <keescook@...omium.org>, Will Drewry <wad@...omium.org>, Frederic Weisbecker <fweisbec@...il.com>, Denys Vlasenko <vda.linux@...glemail.com>, X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>, Denys Vlasenko <dvlasenk@...hat.com>, Oleg Nesterov <oleg@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct pt_regs" 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. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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