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

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Message-ID: <05ae2b86-ba4c-4eaf-9c5f-726fc57c7a2d@linux.ibm.com>
Date: Fri, 24 Jan 2025 17:30:36 +0100
From: Jens Remus <jremus@...ux.ibm.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org
Cc: 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 22.01.2025 03:31, Josh Poimboeuf wrote:
> Enable sframe generation in the VDSO library so kernel and user space
> can unwind through it.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>

> diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile

> @@ -47,13 +47,17 @@ quiet_cmd_vdso2c = VDSO2C  $@
>   $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
>   	$(call if_changed,vdso2c)
>   
> +#ifdef CONFIG_AS_SFRAME
> +SFRAME_CFLAGS := -Wa$(comma)-gsframe
> +#endif
> +

You probably erroneously mixed up C preprocessor and Makefile syntax? :-)

ifeq ($(CONFIG_AS_SFRAME),y)
        SFRAME_CFLAGS := -Wa,--gsframe
endif

$(comma) does not appear to be required in this context.

Regards,
Jens
-- 
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@...ibm.com

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