linux-kernel - [PATCH] riscv: do not select MODULE

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Date: Sat, 11 May 2024 09:57:25 +0800
From: Qingfang Deng <dqfext@...il.com>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: [PATCH] riscv: do not select MODULE_SECTIONS by default

From: Qingfang Deng <qingfang.deng@...lower.com.cn>

Since commit aad15bc85c18 ("riscv: Change code model of module to
medany to improve data accessing"), kernel modules have not been built
with -fPIC, so they wouldn't have R_RISCV_GOT_HI20 or R_RISCV_CALL_PLT
relocations, and handling of those relocations is unnecessary.

If RELOCATABLE=y, kernel modules will be built with -fPIE, which would
reintroduce said relocations, so only select MODULE_SECTIONS when
RELOCATABLE.

Signed-off-by: Qingfang Deng <qingfang.deng@...lower.com.cn>
---
 arch/riscv/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 6bec1bce6586..3f92dd3b45d2 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -169,7 +169,6 @@ config RISCV
 	select LOCK_MM_AND_FIND_VMA
 	select MMU_GATHER_RCU_TABLE_FREE if SMP && MMU
 	select MODULES_USE_ELF_RELA if MODULES
-	select MODULE_SECTIONS if MODULES
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_IRQ
@@ -858,6 +857,7 @@ config PARAVIRT_TIME_ACCOUNTING
 config RELOCATABLE
 	bool "Build a relocatable kernel"
 	depends on MMU && 64BIT && !XIP_KERNEL
+	select MODULE_SECTIONS if MODULES
 	help
           This builds a kernel as a Position Independent Executable (PIE),
           which retains all relocation metadata required to relocate the
-- 
2.34.1