linux-kernel - Re: [PATCH v2] riscv/ftrace: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION

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Date:   Tue, 29 Nov 2022 12:04:56 +0000
From:   Song Shuai <suagrfillet@...il.com>
To:     guoren@...nel.org
Cc:     paul.walmsley@...ive.com, wangkefeng.wang@...wei.com,
        juerg.haefliger@...onical.com, anshuman.khandual@....com,
        alexandre.ghiti@...onical.com, conor.dooley@...rochip.com,
        atishp@...shpatra.org, heiko@...ech.de, palmer@...belt.com,
        apatel@...tanamicro.com, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] riscv/ftrace: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

Song Shuai <suagrfillet@...il.com> 于2022年11月28日周一 15:45写道：
>
> From: Song Shuai <suagrfillet@...il.com>
>
> 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
> Signed-off-by: Song Shuai <suagrfillet@...il.com>
> Tested-by: Guo Ren <guoren@...nel.org>
This patch has conflicts with the commit ("riscv: ftrace: Add
DYNAMIC_FTRACE_WITH_DIRECT_CALLS
support") and its next commit in this file.

How about reposting this patch based on the above commits and folding
it into the v5 version?

Here pastes the link for your convenience.
https://lore.kernel.org/linux-riscv/20221129033230.255947-7-guoren@kernel.org/T/#u

> ---
>  arch/riscv/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index fa78595a6089..afc520a45ded 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -277,6 +277,7 @@ 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
> --
> 2.34.1
>


--
Thanks,
Song