vDSO: Provide clock_getres_time64() where applicable

[PATCH 8/9] arm64: vdso32: Provide clock_getres_time64()

Posted by Thomas Weißschuh 1 month, 2 weeks ago

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.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/arm64/kernel/vdso32/vdso.lds.S      | 1 +
 arch/arm64/kernel/vdso32/vgettimeofday.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/arm64/kernel/vdso32/vdso.lds.S b/arch/arm64/kernel/vdso32/vdso.lds.S
index e02b27487ce8..c374fb0146f3 100644
--- a/arch/arm64/kernel/vdso32/vdso.lds.S
+++ b/arch/arm64/kernel/vdso32/vdso.lds.S
@@ -86,6 +86,7 @@ VERSION
 		__vdso_gettimeofday;
 		__vdso_clock_getres;
 		__vdso_clock_gettime64;
+		__vdso_clock_getres_time64;
 	local: *;
 	};
 }
diff --git a/arch/arm64/kernel/vdso32/vgettimeofday.c b/arch/arm64/kernel/vdso32/vgettimeofday.c
index 29b4d8f61e39..d7b39b0a9668 100644
--- a/arch/arm64/kernel/vdso32/vgettimeofday.c
+++ b/arch/arm64/kernel/vdso32/vgettimeofday.c
@@ -32,6 +32,12 @@ int __vdso_clock_getres(clockid_t clock_id,
 	return __cvdso_clock_getres_time32(clock_id, res);
 }
 
+int __vdso_clock_getres_time64(clockid_t clock_id,
+			       struct __kernel_timespec *res)
+{
+	return __cvdso_clock_getres(clock_id, res);
+}
+
 /* Avoid unresolved references emitted by GCC */
 
 void __aeabi_unwind_cpp_pr0(void)

-- 
2.52.0

Re: [PATCH 8/9] arm64: vdso32: Provide clock_getres_time64()

Posted by Will Deacon 1 month ago

On Tue, Dec 23, 2025 at 07:59:19AM +0100, Thomas Weißschuh wrote:
> 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.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---
>  arch/arm64/kernel/vdso32/vdso.lds.S      | 1 +
>  arch/arm64/kernel/vdso32/vgettimeofday.c | 6 ++++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/kernel/vdso32/vdso.lds.S b/arch/arm64/kernel/vdso32/vdso.lds.S
> index e02b27487ce8..c374fb0146f3 100644
> --- a/arch/arm64/kernel/vdso32/vdso.lds.S
> +++ b/arch/arm64/kernel/vdso32/vdso.lds.S
> @@ -86,6 +86,7 @@ VERSION
>  		__vdso_gettimeofday;
>  		__vdso_clock_getres;
>  		__vdso_clock_gettime64;
> +		__vdso_clock_getres_time64;
>  	local: *;
>  	};
>  }
> diff --git a/arch/arm64/kernel/vdso32/vgettimeofday.c b/arch/arm64/kernel/vdso32/vgettimeofday.c
> index 29b4d8f61e39..d7b39b0a9668 100644
> --- a/arch/arm64/kernel/vdso32/vgettimeofday.c
> +++ b/arch/arm64/kernel/vdso32/vgettimeofday.c
> @@ -32,6 +32,12 @@ int __vdso_clock_getres(clockid_t clock_id,
>  	return __cvdso_clock_getres_time32(clock_id, res);
>  }
>  
> +int __vdso_clock_getres_time64(clockid_t clock_id,
> +			       struct __kernel_timespec *res)
> +{
> +	return __cvdso_clock_getres(clock_id, res);
> +}
> +
>  /* Avoid unresolved references emitted by GCC */
>  
>  void __aeabi_unwind_cpp_pr0(void)

Acked-by: Will Deacon <will@kernel.org>

Please merge this along with the 32-bit Arm change, as it doesn't make
sense otherwise.

Will

[tip: timers/vdso] arm64: vdso32: Provide clock_getres_time64()

Posted by tip-bot2 for Thomas Weißschuh 3 weeks, 6 days ago

The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     f10c2e72b5dea0bc7485a05da8e21781b69d5508
Gitweb:        https://git.kernel.org/tip/f10c2e72b5dea0bc7485a05da8e21781b69d5508
Author:        Thomas Weißschuh <thomas.weissschuh@linutronix.de>
AuthorDate:    Tue, 23 Dec 2025 07:59:19 +01:00
Committer:     Thomas Gleixner <tglx@kernel.org>
CommitterDate: Tue, 13 Jan 2026 14:42:23 +01:00

arm64: vdso32: Provide 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.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://patch.msgid.link/20251223-vdso-compat-time32-v1-8-97ea7a06a543@linutronix.de
---
 arch/arm64/kernel/vdso32/vdso.lds.S      | 1 +
 arch/arm64/kernel/vdso32/vgettimeofday.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/arch/arm64/kernel/vdso32/vdso.lds.S b/arch/arm64/kernel/vdso32/vdso.lds.S
index e02b274..c374fb0 100644
--- a/arch/arm64/kernel/vdso32/vdso.lds.S
+++ b/arch/arm64/kernel/vdso32/vdso.lds.S
@@ -86,6 +86,7 @@ VERSION
 		__vdso_gettimeofday;
 		__vdso_clock_getres;
 		__vdso_clock_gettime64;
+		__vdso_clock_getres_time64;
 	local: *;
 	};
 }
diff --git a/arch/arm64/kernel/vdso32/vgettimeofday.c b/arch/arm64/kernel/vdso32/vgettimeofday.c
index 29b4d8f..0c6998e 100644
--- a/arch/arm64/kernel/vdso32/vgettimeofday.c
+++ b/arch/arm64/kernel/vdso32/vgettimeofday.c
@@ -32,6 +32,11 @@ int __vdso_clock_getres(clockid_t clock_id,
 	return __cvdso_clock_getres_time32(clock_id, res);
 }
 
+int __vdso_clock_getres_time64(clockid_t clock_id, struct __kernel_timespec *res)
+{
+	return __cvdso_clock_getres(clock_id, res);
+}
+
 /* Avoid unresolved references emitted by GCC */
 
 void __aeabi_unwind_cpp_pr0(void)