linux-kernel - [PATCH 2/3] arm64: vdso32: Stop suppressing warnings

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Message-Id: <20250821-vdso-arm64-compat-bitsperlong-v1-2-700bcabe7732@linutronix.de>
Date: Thu, 21 Aug 2025 09:56:45 +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 2/3] arm64: vdso32: Stop suppressing warnings

These warnings don't seem to trigger anymore. Probably due to the
introduction of the vdso/ header namespace. Nowadays these suppression
only hide real problems.

Re-enable the warnings.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/arm64/kernel/vdso32/Makefile | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index f2dfdc7dc8185bc045907283b68ab18fed980312..fd80123bc8e620d868040a61244e83575d855e35 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -21,8 +21,6 @@ endif
 
 cc32-option = $(call try-run,\
         $(CC_COMPAT) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
-cc32-disable-warning = $(call try-run,\
-	$(CC_COMPAT) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
 
 # We cannot use the global flags to compile the vDSO files, the main reason
 # being that the 32-bit compiler may be older than the main (64-bit) compiler
@@ -74,16 +72,6 @@ VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
 VDSO_CFLAGS += -Werror=date-time
 VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)
 
-# The 32-bit compiler does not provide 128-bit integers, which are used in
-# some headers that are indirectly included from the vDSO code.
-# This hack makes the compiler happy and should trigger a warning/error if
-# variables of such type are referenced.
-VDSO_CFLAGS += -D__uint128_t='void*'
-# Silence some warnings coming from headers that operate on long's
-# (on GCC 4.8 or older, there is unfortunately no way to silence this warning)
-VDSO_CFLAGS += $(call cc32-disable-warning,shift-count-overflow)
-VDSO_CFLAGS += -Wno-int-to-pointer-cast
-
 # Compile as THUMB2 or ARM. Unwinding via frame-pointers in THUMB2 is
 # unreliable.
 ifeq ($(CONFIG_THUMB2_COMPAT_VDSO), y)

-- 
2.50.1