From a05f14de04e989f0bc32cea128243090e5e5d54b Mon Sep 17 00:00:00 2001 From: Anna-Maria Behnsen Date: Mon, 3 Mar 2025 12:11:06 +0100 Subject: [PATCH] vdso/datapage: Define vdso_clock to prepare for multiple PTP clocks MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Multiple PTP clocks, which are independent of timekeeping, are required for systems, which utilize PTP for synchronizing e.g. automation systems independent of clock TAI. PTP clocks are slow to access, but applications require fast access to the relevant time similar to the regular timekeeping relevant clocks. To prepare for that the VDSO data representation must be reworked. For transition to the new structure of the vdso, add a define which maps vdso_clock to vdso_data. This will be removed when all users are updated step by step. No functional change. Signed-off-by: Anna-Maria Behnsen Signed-off-by: Nam Cao Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-4-c1b5c69a166f@linutronix.de --- include/vdso/datapage.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h index dfd98f969f151..1df22e8bb9b31 100644 --- a/include/vdso/datapage.h +++ b/include/vdso/datapage.h @@ -129,6 +129,8 @@ struct vdso_time_data { struct arch_vdso_time_data arch_data; } ____cacheline_aligned; +#define vdso_clock vdso_time_data + /** * struct vdso_rng_data - vdso RNG state information * @generation: counter representing the number of RNG reseeds -- 2.39.5