linux-kernel - Re: [PATCH v8 RESEND 2/9] LoongArch/ftrace: Add recordmcount support

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Message-ID: <20221122175112.513531bd@gandalf.local.home>
Date:   Tue, 22 Nov 2022 17:51:12 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Qing Zhang <zhangqing@...ngson.cn>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 RESEND 2/9] LoongArch/ftrace: Add recordmcount
 support

On Wed, 16 Nov 2022 16:23:31 +0800
Qing Zhang <zhangqing@...ngson.cn> wrote:

> Recordmcount utility under scripts is run, after compiling each object,
> to find out all the locations of calling _mcount() and put them into
> specific seciton named __mcount_loc.
> Then linker collects all such information into a table in the kernel image
> (between __start_mcount_loc and __stop_mcount_loc) for later use by ftrace.
> 
> This patch adds loongarch specific definitions to identify such locations.
> On loongarch, only C version is used to build the kernel now that
> CONFIG_HAVE_C_RECORDMCOUNT is on.
> 
> Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
> ---
>  arch/loongarch/Kconfig |  2 ++
>  scripts/recordmcount.c | 23 +++++++++++++++++++++++
>  2 files changed, 25 insertions(+)
> 

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve