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Message-ID: <20240916114605.GA4723@noisy.programming.kicks-ass.net>
Date: Mon, 16 Sep 2024 13:46:05 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: x86@...nel.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>
Subject: Re: [PATCH v2 02/11] unwind/x86: Add HAVE_USER_UNWIND
On Sat, Sep 14, 2024 at 01:02:04AM +0200, Josh Poimboeuf wrote:
> Use ARCH_INIT_USER_FP_FRAME to describe how frame pointers are unwound
> on x86, and enable HAVE_USER_UNWIND accordinlgy so the user unwind
> interfaces can be used.
>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
> ---
> arch/x86/Kconfig | 1 +
> arch/x86/include/asm/user_unwind.h | 11 +++++++++++
> 2 files changed, 12 insertions(+)
> create mode 100644 arch/x86/include/asm/user_unwind.h
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 007bab9f2a0e..266edff59058 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -286,6 +286,7 @@ config X86
> select HAVE_UACCESS_VALIDATION if HAVE_OBJTOOL
> select HAVE_UNSTABLE_SCHED_CLOCK
> select HAVE_USER_RETURN_NOTIFIER
> + select HAVE_USER_UNWIND
> select HAVE_GENERIC_VDSO
> select VDSO_GETRANDOM if X86_64
> select HOTPLUG_PARALLEL if SMP && X86_64
> diff --git a/arch/x86/include/asm/user_unwind.h b/arch/x86/include/asm/user_unwind.h
> new file mode 100644
> index 000000000000..8c509c65cfb5
> --- /dev/null
> +++ b/arch/x86/include/asm/user_unwind.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_X86_USER_UNWIND_H
> +#define _ASM_X86_USER_UNWIND_H
> +
> +#define ARCH_INIT_USER_FP_FRAME \
> + .ra_off = (s32)sizeof(long) * -1, \
> + .cfa_off = (s32)sizeof(long) * 2, \
> + .fp_off = (s32)sizeof(long) * -2, \
> + .use_fp = true,
What about compat crap?
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