linux-kernel - Re: [PATCH RESEND] riscv : select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION

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Message-ID: <CAAYs2=hx49ahtY3pe1z241Vd1mRNZjc-oigubmKy0aGqg6T8ag@mail.gmail.com>
Date:   Tue, 22 Nov 2022 10:10:46 +0000
From:   Song Shuai <suagrfillet@...il.com>
To:     Guo Ren <guoren@...nel.org>, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu
Cc:     guoren@...ux.alibaba.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] riscv : select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

Song Shuai <suagrfillet@...il.com> 于2022年9月23日周五 10:03写道：
>
> riscv now uses -fpatchable-function-entry with dynamic ftrace after
> the `afc76b8b8` commit, which means recordmcount shouldn't be called
> to create the __mcount_loc section before the vmlinux linking.
>
> We should select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY to tell
> Makefile not to run recordmcount.
>
Hi,Guo:

Can this patch squeeze into your v3 series ?

Thanks,
Song
> Signed-off-by: Song Shuai <suagrfillet@...il.com>
> ---
>  arch/riscv/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index c22f58155948..25db8cea876a 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -246,6 +246,7 @@ config ARCH_RV64I
>         select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8)
>         select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
>         select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
> +       select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE
>         select HAVE_FUNCTION_GRAPH_TRACER
>         select HAVE_FUNCTION_TRACER if !XIP_KERNEL
>         select SWIOTLB if MMU
> --
> 2.20.1
>