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

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Date:   Mon, 28 Nov 2022 22:12:02 +0800
From:   Song Shuai <suagrfillet@...il.com>
To:     Guo Ren <guoren@...nel.org>
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

Guo Ren <guoren@...nel.org> 于2022年11月28日周一 21:47写道：
>
> 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>
>
Thanks for your test.
I'll correct this ref in the next version.
> > > 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.
>
Got it.
> >
> > 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



-- 
Thanks,
Song