linux-kernel - [PATCH 1/9] vdso: Add prototype for __vdso_clock_getres

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Message-Id: <20251223-vdso-compat-time32-v1-1-97ea7a06a543@linutronix.de>
Date: Tue, 23 Dec 2025 07:59:12 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Shuah Khan <shuah@...nel.org>, 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>, 
 Russell King <linux@...linux.org.uk>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Russell King <rmk+kernel@...linux.org.uk>, 
 linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org, 
 Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 1/9] vdso: Add prototype for __vdso_clock_getres_time64()

For consistency with __vdso_clock_gettime64() there should also be a
64-bit variant of clock_getres(). This will allow the extension of
CONFIG_COMPAT_32BIT_TIME to the vDSO and finally the removal of 32-bit
time types from the kernel and UAPI. The generic vDSO library already
provides nearly all necessary building blocks for architectures to
provide this function. Only a prototype is missing.

Add the prototype to the generic header so architectures can start
providing this function.

Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 include/vdso/gettime.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/vdso/gettime.h b/include/vdso/gettime.h
index 9ac161866653..16a0a0556b86 100644
--- a/include/vdso/gettime.h
+++ b/include/vdso/gettime.h
@@ -20,5 +20,6 @@ int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
 __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);
+int __vdso_clock_getres_time64(clockid_t clock, struct __kernel_timespec *ts);

 #endif

-- 
2.52.0