linux-kernel - [PATCH 3/3] arm64: vdso32: Respect -Werror from kbuild

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Message-Id: <20250821-vdso-arm64-compat-bitsperlong-v1-3-700bcabe7732@linutronix.de>
Date: Thu, 21 Aug 2025 09:56:46 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>, 
 Vincenzo Frascino <vincenzo.frascino@....com>
Cc: John Stultz <jstultz@...gle.com>, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 3/3] arm64: vdso32: Respect -Werror from kbuild

The compiler flags for the compat vDSO are built manually as they are not
compatible with the ones from kbuild. CONFIG_WERROR is not respected.

Explicitly inherit -Werror from kbuild.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/arm64/kernel/vdso32/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index fd80123bc8e620d868040a61244e83575d855e35..5de4deaf42992046463963df193de47cd07ec1ae 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -61,6 +61,7 @@ VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1
 # KBUILD_CFLAGS from top-level Makefile
 VDSO_CFLAGS += -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
                -fno-strict-aliasing -fno-common \
+               $(filter -Werror,$(KBUILD_CPPFLAGS)) \
                -Werror-implicit-function-declaration \
                -Wno-format-security \
                -std=gnu11

-- 
2.50.1