linux-kernel - Re: [PATCH V8 1/4] riscv: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION

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Message-ID: <87a5ycfysp.fsf@all.your.base.are.belong.to.us>
Date:   Wed, 10 May 2023 09:09:10 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Song Shuai <suagrfillet@...il.com>, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, rostedt@...dmis.org,
        mhiramat@...nel.org, mark.rutland@....com, guoren@...nel.org,
        e.shatokhin@...ro.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        Song Shuai <suagrfillet@...il.com>
Subject: Re: [PATCH V8 1/4] riscv: select
 FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

Song Shuai <suagrfillet@...il.com> writes:

> In RISC-V, -fpatchable-function-entry option is used to support
> dynamic ftrace in this commit afc76b8b8011 ("riscv: Using
> PATCHABLE_FUNCTION_ENTRY instead of MCOUNT"). So recordmcount
> don't have to be called to create the __mcount_loc section before
> the vmlinux linking.
>
> Here selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY to tell
> Makefile not to run recordmcount.
>
> Link: https://lore.kernel.org/linux-riscv/CAAYs2=j3Eak9vU6xbAw0zPuoh00rh8v5C2U3fePkokZFibWs2g@mail.gmail.com/T/#t
> Link: https://lore.kernel.org/linux-riscv/Y4jtfrJt+%2FQ5nMOz@spud/
> Signed-off-by: Song Shuai <suagrfillet@...il.com>
> Tested-by: Guo Ren <guoren@...nel.org>
> Signed-off-by: Guo Ren <guoren@...nel.org>

Acked-by: Björn Töpel <bjorn@...osinc.com>