linux-kernel - Re: [PATCH v4 09/39] x86/vdso: Enable sframe generation in VDSO

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Message-ID: <20250124165313.aejzzy5c5siqbnfq@jpoimboe>
Date: Fri, 24 Jan 2025 08:53:13 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Jens Remus <jremus@...ux.ibm.com>
Cc: x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, Indu Bhagat <indu.bhagat@...cle.com>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	linux-toolchains@...r.kernel.org, Jordan Rome <jordalgo@...a.com>,
	Sam James <sam@...too.org>, linux-trace-kernel@...r.kernel.org,
	Andrii Nakryiko <andrii.nakryiko@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Florian Weimer <fweimer@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Weinan Liu <wnliu@...gle.com>, Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v4 09/39] x86/vdso: Enable sframe generation in VDSO

On Fri, Jan 24, 2025 at 08:43:35AM -0800, Josh Poimboeuf wrote:
> On Fri, Jan 24, 2025 at 05:00:27PM +0100, Jens Remus wrote:
> > On 22.01.2025 03:31, Josh Poimboeuf wrote:
> > > +#ifdef __x86_64__
> > 
> > #if defined(__x86_64__) && defined(CONFIG_AS_SFRAME)
> > 
> > AFAIK the kernel has a minimum binutils requirement of 2.25 [1]
> > and assembler option "--gsframe" as well as directive
> > ".cfi_sections .sframe" were introduced with 2.40.
> 
> True, I'll change it to just '#ifdef CONFIG_AS_SFRAME' since that's what
> really matters (and 32-bit doesn't support it anyway).

Actually, just CONFIG_AS_CFAME didn't work as 64-bit still compiles some
32-bit asm files.  I'll go with your suggestion.

-- 
Josh