linux-kernel - [tip: timers/ptp] vdso/gettimeofday: Introduce vdso_clockid

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Message-ID: <175205505591.406.9674153187149360854.tip-bot2@tip-bot2>
Date: Wed, 09 Jul 2025 09:57:35 -0000
From:
 tip-bot2 for Thomas Weißschuh <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: thomas.weissschuh@...utronix.de, Thomas Gleixner <tglx@...utronix.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/ptp] vdso/gettimeofday: Introduce vdso_clockid_valid()

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

Commit-ID:     a2a9c3129dd8495e48a54f19193adbac1efe673b
Gitweb:        https://git.kernel.org/tip/a2a9c3129dd8495e48a54f19193adbac1efe673b
Author:        Thomas Weißschuh <thomas.weissschuh@...utronix.de>
AuthorDate:    Tue, 01 Jul 2025 10:58:01 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 09 Jul 2025 11:52:34 +02:00

vdso/gettimeofday: Introduce vdso_clockid_valid()

Move the clock ID validation check into a common helper.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/all/20250701-vdso-auxclock-v1-7-df7d9f87b9b8@linutronix.de

---
 lib/vdso/gettimeofday.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index 7e79b02..87e7aae 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -71,6 +71,12 @@ static inline bool vdso_cycles_ok(u64 cycles)
 }
 #endif
 
+static __always_inline bool vdso_clockid_valid(clockid_t clock)
+{
+	/* Check for negative values or invalid clocks */
+	return likely((u32) clock < MAX_CLOCKS);
+}
+
 #ifdef CONFIG_TIME_NS
 
 #ifdef CONFIG_GENERIC_VDSO_DATA_STORE
@@ -268,8 +274,7 @@ __cvdso_clock_gettime_common(const struct vdso_time_data *vd, clockid_t clock,
 	const struct vdso_clock *vc = vd->clock_data;
 	u32 msk;
 
-	/* Check for negative values or invalid clocks */
-	if (unlikely((u32) clock >= MAX_CLOCKS))
+	if (!vdso_clockid_valid(clock))
 		return false;
 
 	/*
@@ -405,8 +410,7 @@ bool __cvdso_clock_getres_common(const struct vdso_time_data *vd, clockid_t cloc
 	u32 msk;
 	u64 ns;
 
-	/* Check for negative values or invalid clocks */
-	if (unlikely((u32) clock >= MAX_CLOCKS))
+	if (!vdso_clockid_valid(clock))
 		return false;
 
 	if (IS_ENABLED(CONFIG_TIME_NS) &&