linux-kernel - [PATCH] ARM: disable FDPIC ABI

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Date:   Mon,  1 Aug 2022 15:17:20 -0400
From:   Ben Wolsieffer <ben.wolsieffer@...ring.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Ben Wolsieffer <Ben.Wolsieffer@...ring.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nick Hawkins <nick.hawkins@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: disable FDPIC ABI

When building with an arm-*-uclinuxfdpiceabi toolchain, the FDPIC ABI is
enabled by default but should not be used to build the kernel.
Therefore, pass -mno-fdpic if supported by the compiler.

Signed-off-by: Ben Wolsieffer <Ben.Wolsieffer@...ring.com>
---
 arch/arm/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index c8e3633f5434..88be49b71d40 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -22,6 +22,9 @@ GZFLAGS		:=-9
 # Never generate .eh_frame
 KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
 
+# Disable FDPIC ABI
+KBUILD_CFLAGS	+= $(call cc-option,-mno-fdpic)
+
 # This should work on most of the modern platforms
 KBUILD_DEFCONFIG := multi_v7_defconfig
 
-- 
2.37.0