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

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Date:   Mon, 28 Nov 2022 21:47:38 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Song Shuai <suagrfillet@...il.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, 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

On Tue, Nov 22, 2022 at 6:11 PM Song Shuai <suagrfillet@...il.com> wrote:
>
> 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
The ref commit format needs to be corrected. Others:
Tested-by: Guo Ren <guoren@...nel.org>

> > 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 ?
They don't have a dependency, and it's unnecessary. A single patch is
easy for the maintainer to pick up.

>
> 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
> >



-- 
Best Regards
 Guo Ren