linux-kernel - Re: [PATCH v3 09/19] unwind: Introduce sframe user space unwinding

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Message-ID: <23ff3782-c192-43eb-99c2-fe2746da7d4c@linux.ibm.com>
Date: Wed, 13 Nov 2024 16:56:25 +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.kerne.org,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Florian Weimer <fweimer@...hat.com>, Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v3 09/19] unwind: Introduce sframe user space unwinding

On 28.10.2024 22:47, Josh Poimboeuf wrote:

> diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c

> @@ -68,7 +83,12 @@ int unwind_user_start(struct unwind_user_state *state)
>   		return -EINVAL;
>   	}
>   
> -	state->type = UNWIND_USER_TYPE_FP;
> +	if (current_has_sframe())
> +		state->type = UNWIND_USER_TYPE_SFRAME;
> +	else if (IS_ENABLED(CONFIG_UNWIND_USER_FP))

The test must be for CONFIG_HAVE_UNWIND_USER_FP. :-)

> +		state->type = UNWIND_USER_TYPE_FP;
> +	else
> +		state->type = UNWIND_USER_TYPE_NONE;
>   
>   	state->sp = user_stack_pointer(regs);
>   	state->ip = instruction_pointer(regs);

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

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