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

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Message-Id: <20221128154506.2691-1-suagrfillet@gmail.com>
Date:   Mon, 28 Nov 2022 23:45:06 +0800
From:   Song Shuai <suagrfillet@...il.com>
To:     guoren@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, apatel@...tanamicro.com, heiko@...ech.de,
        atishp@...shpatra.org, conor.dooley@...rochip.com,
        alexandre.ghiti@...onical.com, anshuman.khandual@....com,
        juerg.haefliger@...onical.com, wangkefeng.wang@...wei.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Song Shuai <suagrfillet@...il.com>
Subject: [PATCH v2] riscv/ftrace: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

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>
---
 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