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From: Arnd Bergmann <arnd@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org,
	Masahiro Yamada <masahiroy@kernel.org>,
	linux-kbuild@vger.kernel.org
Cc: "Arnd Bergmann" <arnd@arndb.de>,
	"Matt Turner" <mattst88@gmail.com>,
	"Vineet Gupta" <vgupta@kernel.org>,
	"Russell King" <linux@armlinux.org.uk>,
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	"Steven Rostedt" <rostedt@goodmis.org>,
	"Masami Hiramatsu" <mhiramat@kernel.org>,
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	"Guo Ren" <guoren@kernel.org>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Ard Biesheuvel" <ardb@kernel.org>,
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Subject: [PATCH 15/22] arch: vdso: consolidate gettime prototypes
Date: Wed,  8 Nov 2023 13:58:36 +0100	[thread overview]
Message-ID: <20231108125843.3806765-16-arnd@kernel.org> (raw)
In-Reply-To: <20231108125843.3806765-1-arnd@kernel.org>

From: Arnd Bergmann <arnd@arndb.de>

The VDSO functions are defined as globals in the kernel sources but intended
to be called from userspace, so there is no need to declare them in a kernel
side header.

Without a prototype, this now causes warnings such as

arch/mips/vdso/vgettimeofday.c:14:5: error: no previous prototype for '__vdso_clock_gettime' [-Werror=missing-prototypes]
arch/mips/vdso/vgettimeofday.c:28:5: error: no previous prototype for '__vdso_gettimeofday' [-Werror=missing-prototypes]
arch/mips/vdso/vgettimeofday.c:36:5: error: no previous prototype for '__vdso_clock_getres' [-Werror=missing-prototypes]
arch/mips/vdso/vgettimeofday.c:42:5: error: no previous prototype for '__vdso_clock_gettime64' [-Werror=missing-prototypes]
arch/sparc/vdso/vclock_gettime.c:254:1: error: no previous prototype for '__vdso_clock_gettime' [-Werror=missing-prototypes]
arch/sparc/vdso/vclock_gettime.c:282:1: error: no previous prototype for '__vdso_clock_gettime_stick' [-Werror=missing-prototypes]
arch/sparc/vdso/vclock_gettime.c:307:1: error: no previous prototype for '__vdso_gettimeofday' [-Werror=missing-prototypes]
arch/sparc/vdso/vclock_gettime.c:343:1: error: no previous prototype for '__vdso_gettimeofday_stick' [-Werror=missing-prototypes]

Most architectures have already added workarounds for these by adding
declarations somewhere, but since these are all compatible, we should
really just have one copy, with an #ifdef check for the 32-bit vs
64-bit variant and use that everywhere.

Unfortunately, the sparc version is currently incompatible since
that never added support for __vdso_clock_gettime64() in 32-bit
userland. For the moment, I'm leaving this one out, as I can't
easily test it and it requires a larger rework.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/include/asm/vdso.h              |  5 -----
 arch/arm/vdso/vgettimeofday.c            |  1 +
 arch/arm64/kernel/vdso32/vgettimeofday.c |  1 +
 arch/csky/kernel/vdso/vgettimeofday.c    | 11 +----------
 arch/loongarch/vdso/vgettimeofday.c      |  7 +------
 arch/mips/vdso/vgettimeofday.c           |  1 +
 arch/riscv/kernel/vdso/vgettimeofday.c   |  7 +------
 arch/x86/entry/vdso/vclock_gettime.c     | 10 +---------
 arch/x86/include/asm/vdso/gettimeofday.h |  2 --
 arch/x86/um/vdso/um_vdso.c               |  1 +
 include/vdso/gettime.h                   | 23 +++++++++++++++++++++++
 11 files changed, 31 insertions(+), 38 deletions(-)
 create mode 100644 include/vdso/gettime.h

diff --git a/arch/arm/include/asm/vdso.h b/arch/arm/include/asm/vdso.h
index 422c3afa806a..5b85889f82ee 100644
--- a/arch/arm/include/asm/vdso.h
+++ b/arch/arm/include/asm/vdso.h
@@ -24,11 +24,6 @@ static inline void arm_install_vdso(struct mm_struct *mm, unsigned long addr)
 
 #endif /* CONFIG_VDSO */
 
-int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts);
-int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts);
-int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
-int __vdso_clock_getres(clockid_t clock_id, struct old_timespec32 *res);
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */
diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c
index a003beacac76..3554aa35f1ba 100644
--- a/arch/arm/vdso/vgettimeofday.c
+++ b/arch/arm/vdso/vgettimeofday.c
@@ -8,6 +8,7 @@
 #include <linux/types.h>
 #include <asm/vdso.h>
 #include <asm/unwind.h>
+#include <vdso/gettime.h>
 
 int __vdso_clock_gettime(clockid_t clock,
 			 struct old_timespec32 *ts)
diff --git a/arch/arm64/kernel/vdso32/vgettimeofday.c b/arch/arm64/kernel/vdso32/vgettimeofday.c
index 5acff29c5991..e23c7f4ef26b 100644
--- a/arch/arm64/kernel/vdso32/vgettimeofday.c
+++ b/arch/arm64/kernel/vdso32/vgettimeofday.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2018 ARM Limited
  *
  */
+#include <vdso/gettime.h>
 
 int __vdso_clock_gettime(clockid_t clock,
 			 struct old_timespec32 *ts)
diff --git a/arch/csky/kernel/vdso/vgettimeofday.c b/arch/csky/kernel/vdso/vgettimeofday.c
index c4831145eed5..55af30e83752 100644
--- a/arch/csky/kernel/vdso/vgettimeofday.c
+++ b/arch/csky/kernel/vdso/vgettimeofday.c
@@ -2,36 +2,27 @@
 
 #include <linux/time.h>
 #include <linux/types.h>
+#include <vdso/gettime.h>
 
 extern
-int __vdso_clock_gettime(clockid_t clock,
-			 struct old_timespec32 *ts);
 int __vdso_clock_gettime(clockid_t clock,
 			 struct old_timespec32 *ts)
 {
 	return __cvdso_clock_gettime32(clock, ts);
 }
 
-int __vdso_clock_gettime64(clockid_t clock,
-			   struct __kernel_timespec *ts);
 int __vdso_clock_gettime64(clockid_t clock,
 			   struct __kernel_timespec *ts)
 {
 	return __cvdso_clock_gettime(clock, ts);
 }
 
-extern
-int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
-			struct timezone *tz);
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
 			struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
-extern
-int __vdso_clock_getres(clockid_t clock_id,
-			struct old_timespec32 *res);
 int __vdso_clock_getres(clockid_t clock_id,
 			struct old_timespec32 *res)
 {
diff --git a/arch/loongarch/vdso/vgettimeofday.c b/arch/loongarch/vdso/vgettimeofday.c
index 8f22863bd7ea..0885c1f3a89d 100644
--- a/arch/loongarch/vdso/vgettimeofday.c
+++ b/arch/loongarch/vdso/vgettimeofday.c
@@ -5,23 +5,18 @@
  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  */
 #include <linux/types.h>
+#include <vdso/gettime.h>
 
-extern
-int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
 int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
 {
 	return __cvdso_clock_gettime(clock, ts);
 }
 
-extern
-int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
-extern
-int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res);
 int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res)
 {
 	return __cvdso_clock_getres(clock_id, res);
diff --git a/arch/mips/vdso/vgettimeofday.c b/arch/mips/vdso/vgettimeofday.c
index 6b83b6376a4b..604afea3f336 100644
--- a/arch/mips/vdso/vgettimeofday.c
+++ b/arch/mips/vdso/vgettimeofday.c
@@ -9,6 +9,7 @@
  */
 #include <linux/time.h>
 #include <linux/types.h>
+#include <vdso/gettime.h>
 
 #if _MIPS_SIM != _MIPS_SIM_ABI64
 int __vdso_clock_gettime(clockid_t clock,
diff --git a/arch/riscv/kernel/vdso/vgettimeofday.c b/arch/riscv/kernel/vdso/vgettimeofday.c
index cc0d80699c31..b35057802584 100644
--- a/arch/riscv/kernel/vdso/vgettimeofday.c
+++ b/arch/riscv/kernel/vdso/vgettimeofday.c
@@ -8,23 +8,18 @@
 
 #include <linux/time.h>
 #include <linux/types.h>
+#include <vdso/gettime.h>
 
-extern
-int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
 int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
 {
 	return __cvdso_clock_gettime(clock, ts);
 }
 
-extern
-int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
-extern
-int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res);
 int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res)
 {
 	return __cvdso_clock_getres(clock_id, res);
diff --git a/arch/x86/entry/vdso/vclock_gettime.c b/arch/x86/entry/vdso/vclock_gettime.c
index 7d70935b6758..0debc194bd78 100644
--- a/arch/x86/entry/vdso/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vclock_gettime.c
@@ -11,12 +11,10 @@
 #include <linux/time.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
+#include <vdso/gettime.h>
 
 #include "../../../../lib/vdso/gettimeofday.c"
 
-extern int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
-extern __kernel_old_time_t __vdso_time(__kernel_old_time_t *t);
-
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
@@ -35,9 +33,6 @@ __kernel_old_time_t time(__kernel_old_time_t *t)	__attribute__((weak, alias("__v
 
 #if defined(CONFIG_X86_64) && !defined(BUILD_VDSO32_64)
 /* both 64-bit and x32 use these */
-extern int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
-extern int __vdso_clock_getres(clockid_t clock, struct __kernel_timespec *res);
-
 int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
 {
 	return __cvdso_clock_gettime(clock, ts);
@@ -56,9 +51,6 @@ int clock_getres(clockid_t, struct __kernel_timespec *)
 
 #else
 /* i386 only */
-extern int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts);
-extern int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res);
-
 int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
 {
 	return __cvdso_clock_gettime32(clock, ts);
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h
index c81858d903dc..a46edb0e0cf7 100644
--- a/arch/x86/include/asm/vdso/gettimeofday.h
+++ b/arch/x86/include/asm/vdso/gettimeofday.h
@@ -337,8 +337,6 @@ u64 vdso_calc_delta(u64 cycles, u64 last, u64 mask, u32 mult)
 }
 #define vdso_calc_delta vdso_calc_delta
 
-int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts);
-
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */
diff --git a/arch/x86/um/vdso/um_vdso.c b/arch/x86/um/vdso/um_vdso.c
index ff0f3b4b6c45..63768dd347ce 100644
--- a/arch/x86/um/vdso/um_vdso.c
+++ b/arch/x86/um/vdso/um_vdso.c
@@ -12,6 +12,7 @@
 #include <linux/time.h>
 #include <linux/getcpu.h>
 #include <asm/unistd.h>
+#include <vdso/gettime.h>
 
 int __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
 {
diff --git a/include/vdso/gettime.h b/include/vdso/gettime.h
new file mode 100644
index 000000000000..c50d152e7b3e
--- /dev/null
+++ b/include/vdso/gettime.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _VDSO_GETTIME_H
+#define _VDSO_GETTIME_H
+
+#include <linux/types.h>
+
+struct __kernel_timespec;
+struct timezone;
+
+#if !defined(CONFIG_64BIT) || defined(BUILD_VDSO32_64)
+struct old_timespec32;
+int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res);
+int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts);
+#else
+int __vdso_clock_getres(clockid_t clock, struct __kernel_timespec *res);
+int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
+#endif
+
+__kernel_old_time_t __vdso_time(__kernel_old_time_t *t);
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
+int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts);
+
+#endif
-- 
2.39.2


  parent reply	other threads:[~2023-11-08 13:02 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-08 12:58 [PATCH 00/22] -Wmissing-prototype warning fixes Arnd Bergmann
2023-11-08 12:58 ` [PATCH 01/22] [RESEND^2] ida: make 'ida_dump' static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 02/22] [RESEND^2] jffs2: mark __jffs2_dbg_superblock_counts() static Arnd Bergmann
2023-11-09  1:07   ` Zhihao Cheng
2023-11-08 12:58 ` [PATCH 03/22] [RESEND] kprobes: unify kprobes_exceptions_nofify() prototypes Arnd Bergmann
2023-11-08 23:20   ` Masami Hiramatsu
2023-11-08 12:58 ` [PATCH 04/22] [RESEND] time: make sysfs_get_uname() function visible in header Arnd Bergmann
2023-11-10 12:41   ` Uwe Kleine-König
2023-11-08 12:58 ` [PATCH 05/22] [RESEND] parport: gsc: mark init function static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 06/22] [RESEND] stackleak: add declarations for global functions Arnd Bergmann
2023-11-08 12:58 ` [PATCH 07/22] [RESEND] sched: fair: move unused stub functions to header Arnd Bergmann
2023-11-08 12:58 ` [PATCH 08/22] [v2] arch: consolidate arch_irq_work_raise prototypes Arnd Bergmann
2024-01-10  9:03   ` Geert Uytterhoeven
2024-01-10 10:20     ` Arnd Bergmann
2023-11-08 12:58 ` [PATCH 09/22] [v2] arch: fix asm-offsets.c building with -Wmissing-prototypes Arnd Bergmann
2023-11-08 19:10   ` Sam Ravnborg
2023-11-08 12:58 ` [PATCH 10/22] microblaze: include linux/cpu.h for trap_init() prototype Arnd Bergmann
2023-11-08 20:42   ` Geert Uytterhoeven
2023-11-08 21:07     ` Arnd Bergmann
2023-11-08 21:10       ` Geert Uytterhoeven
2023-11-08 12:58 ` [PATCH 11/22] x86: sta2x11: include header for sta2x11_get_instance() prototype Arnd Bergmann
2023-11-08 12:58 ` [PATCH 12/22] csky: fix arch_jump_label_transform_static override Arnd Bergmann
2023-11-12  4:21   ` Guo Ren
2023-11-08 12:58 ` [PATCH 13/22] arch: add do_page_fault prototypes Arnd Bergmann
2023-11-08 12:58 ` [PATCH 14/22] arch: add missing prepare_ftrace_return() prototypes Arnd Bergmann
2023-11-08 12:58 ` Arnd Bergmann [this message]
2023-11-08 18:31   ` [PATCH 15/22] arch: vdso: consolidate gettime prototypes Christophe Leroy
2023-11-08 19:37     ` Arnd Bergmann
2023-11-09  7:50       ` Christophe Leroy
2023-11-09 10:18       ` Michael Ellerman
2023-11-09 10:49         ` Christophe Leroy
2023-11-09 12:23           ` Michael Ellerman
2023-11-10 10:16   ` Vincenzo Frascino
2023-11-24 12:04   ` Mark Brown
2023-11-08 12:58 ` [PATCH 16/22] bcachefs: mark bch2_target_to_text_sb() static Arnd Bergmann
2023-11-08 20:19   ` Kent Overstreet
2023-11-08 12:58 ` [PATCH 17/22] powerpc: ps3: move udbg_shutdown_ps3gelic prototype Arnd Bergmann
2023-11-08 14:18   ` Geoff Levand
2023-11-08 15:10     ` Jakub Kicinski
2023-11-08 12:58 ` [PATCH 18/22] powerpc: pasemi: mark pas_shutdown() static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 19/22] powerpc: powermac: mark smp_psurge_{give,take}_timebase static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 20/22] usb: fsl-mph-dr-of: mark fsl_usb2_mpc5121_init() static Arnd Bergmann
2023-11-21 14:12   ` Greg Kroah-Hartman
2023-11-08 12:58 ` [PATCH 21/22] fbdev/fsl-diu-fb: mark wr_reg_wa() static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 22/22] Makefile.extrawarn: turn on missing-prototypes globally Arnd Bergmann
2023-12-07 12:38 ` (subset) [PATCH 00/22] -Wmissing-prototype warning fixes Michael Ellerman

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