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Message-Id: <20250826-vdso-cleanups-v1-3-d9b65750e49f@linutronix.de>
Date: Tue, 26 Aug 2025 08:17:06 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Alexandre Ghiti <alex@...ti.fr>, Nam Cao <namcao@...utronix.de>,
Russell King <linux@...linux.org.uk>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>,
Christian Brauner <brauner@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org, linux-arch@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 03/11] vdso: Move ENABLE_COMPAT_VDSO from core to arm64
The ENABLE_COMAPT_VDSO symbol is only used by arm64 and only for the
time-related functionality. There should be no new users, so it doesn't
need to be in the generic vDSO code.
Move the logic into arm64 architecture-specific code and replace the
explicit define by the standard '#ifdef __aarch64__'.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
arch/arm64/include/asm/vdso/compat_barrier.h | 7 +++----
arch/arm64/include/asm/vdso/compat_gettimeofday.h | 6 +++---
arch/arm64/include/asm/vdso/gettimeofday.h | 8 ++++++++
arch/arm64/kernel/vdso32/Makefile | 1 -
include/vdso/datapage.h | 4 ----
5 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/arch/arm64/include/asm/vdso/compat_barrier.h b/arch/arm64/include/asm/vdso/compat_barrier.h
index 3ac35f4a667cfc8c03fb6b6913c5a02b230a1659..6d75e03d38274a6b8549ab10a0f3c9732e7fae56 100644
--- a/arch/arm64/include/asm/vdso/compat_barrier.h
+++ b/arch/arm64/include/asm/vdso/compat_barrier.h
@@ -7,11 +7,10 @@
#ifndef __ASSEMBLY__
/*
- * Warning: This code is meant to be used with
- * ENABLE_COMPAT_VDSO only.
+ * Warning: This code is meant to be used from the compat vDSO only.
*/
-#ifndef ENABLE_COMPAT_VDSO
-#error This header is meant to be used with ENABLE_COMPAT_VDSO only
+#ifdef __arch64__
+#error This header is meant to be used with from the compat vDSO only
#endif
#ifdef dmb
diff --git a/arch/arm64/include/asm/vdso/compat_gettimeofday.h b/arch/arm64/include/asm/vdso/compat_gettimeofday.h
index d60ea7a72a9cb3457c412d0ece21ed76ae77782d..7d1a116549b1b98d6eb7a78d053958c6a71799ec 100644
--- a/arch/arm64/include/asm/vdso/compat_gettimeofday.h
+++ b/arch/arm64/include/asm/vdso/compat_gettimeofday.h
@@ -2,8 +2,8 @@
/*
* Copyright (C) 2018 ARM Limited
*/
-#ifndef __ASM_VDSO_GETTIMEOFDAY_H
-#define __ASM_VDSO_GETTIMEOFDAY_H
+#ifndef __ASM_VDSO_COMPAT_GETTIMEOFDAY_H
+#define __ASM_VDSO_COMPAT_GETTIMEOFDAY_H
#ifndef __ASSEMBLY__
@@ -163,4 +163,4 @@ static inline bool vdso_clocksource_ok(const struct vdso_clock *vc)
#endif /* !__ASSEMBLY__ */
-#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
+#endif /* __ASM_VDSO_COMPAT_GETTIMEOFDAY_H */
diff --git a/arch/arm64/include/asm/vdso/gettimeofday.h b/arch/arm64/include/asm/vdso/gettimeofday.h
index da1ab87595925fdfa74fd10d0c9548f109970588..c59e84105b43cdb0c823da3dd793a83781f84302 100644
--- a/arch/arm64/include/asm/vdso/gettimeofday.h
+++ b/arch/arm64/include/asm/vdso/gettimeofday.h
@@ -5,6 +5,8 @@
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
#define __ASM_VDSO_GETTIMEOFDAY_H
+#ifdef __aarch64__
+
#ifndef __ASSEMBLY__
#include <asm/alternative.h>
@@ -96,4 +98,10 @@ static __always_inline const struct vdso_time_data *__arch_get_vdso_u_time_data(
#endif /* !__ASSEMBLY__ */
+#else /* !__aarch64__ */
+
+#include "compat_gettimeofday.h"
+
+#endif /* __aarch64__ */
+
#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index f2dfdc7dc8185bc045907283b68ab18fed980312..230fdc26796aa5ba561519bcf2de8ccd7ad3b9f8 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -59,7 +59,6 @@ VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING
VDSO_CAFLAGS += -march=armv8-a
VDSO_CFLAGS := $(VDSO_CAFLAGS)
-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 \
diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index 02533038640e53c40291c7e09139e0f9b32f502a..0b1982f15de427723c9ff8502ca1eaa195f9a6a1 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -196,11 +196,7 @@ enum vdso_pages {
* - clock_gettime_fallback(): fallback for clock_gettime.
* - clock_getres_fallback(): fallback for clock_getres.
*/
-#ifdef ENABLE_COMPAT_VDSO
-#include <asm/vdso/compat_gettimeofday.h>
-#else
#include <asm/vdso/gettimeofday.h>
-#endif /* ENABLE_COMPAT_VDSO */
#else /* !__ASSEMBLY__ */
--
2.50.1
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