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Date: Mon, 2 Mar 2015 09:45:02 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Andy Lutomirski <luto@...capital.net> Cc: Denys Vlasenko <dvlasenk@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Alexei Starovoitov <ast@...mgrid.com>, Will Drewry <wad@...omium.org>, Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 3/3] x86: do not save callee-preserved registers around lockdep_sys_exit_thunk On Sun, Mar 01, 2015 at 08:16:18AM -0800, Andy Lutomirski wrote: > On Fri, Feb 27, 2015 at 4:29 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote: > > Internally, lockdep_sys_exit_thunk saves callee-clobbered registers, > > and calls a C function, lockdep_sys_exix. Thus, callee-preserved > > won't be mangled, there is no need to save them. > > > > Patch was run-tested. > > Peterz, I think this was your code. It was, I'm forever unsure on when what register are saved by which macros/functions. Thanks! -- 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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