linux-kernel - Re: [PATCH 1/8] ftrace: Replace uses of _ftrace_direct APIs with _ftrace_direct

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Message-ID: <CABRcYmLrYXuP-yio0dy4WskENn81Qw2WS0ArMp=rdHuiGyjYhQ@mail.gmail.com>
Date:   Thu, 2 Feb 2023 18:37:33 +0100
From:   Florent Revest <revest@...omium.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, bpf@...r.kernel.org,
        catalin.marinas@....com, will@...nel.org, rostedt@...dmis.org,
        mhiramat@...nel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kpsingh@...nel.org, jolsa@...nel.org,
        xukuohai@...weicloud.com
Subject: Re: [PATCH 1/8] ftrace: Replace uses of _ftrace_direct APIs with _ftrace_direct_multi

On Thu, Feb 2, 2023 at 4:02 PM Mark Rutland <mark.rutland@....com> wrote:
> Looking at samples/ftrace/, as of this patch we have a few samples that are
> almost identical, modulo the function being traced, and some different register
> shuffling for arguments:
>
> * ftrace-direct.c and ftrace-direct-multi.c
> * ftrace-direct-modify.c and ftrace-direct-modify
>
> ... perhaps it would be better to just delete the !multi versions ?

The multi versions hook two functions and the !multi hook just one but
I agree that this granularity in coverage is probably just a
maintenance burden and doesn't help with much! :)
I'll delete the !multi in v2, as part of the patch 2 and patch 1 will
just migrate the selftest to use the multi API.