From fa8152ca221110e14e43040bd442c8140bc2e03c Mon Sep 17 00:00:00 2001 From: Anna-Maria Behnsen Date: Mon, 3 Mar 2025 12:11:05 +0100 Subject: [PATCH] vdso: Make vdso_time_data cacheline aligned MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit vdso_time_data is not cacheline aligned at the moment. When instantiating an array, the start of the second array member is not cache line aligned. This increases the number of the required cache lines which needs to be read when handling e.g. CLOCK_MONOTONIC_RAW, because the data spawns an extra cache line if the previous data does not end at a cache line boundary. Therefore make struct vdso_time_data cacheline aligned. 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-v1-3-c1b5c69a166f@linutronix.de --- include/vdso/datapage.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h index ed4fb4c06e3ee..dfd98f969f151 100644 --- a/include/vdso/datapage.h +++ b/include/vdso/datapage.h @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -126,7 +127,7 @@ struct vdso_time_data { u32 __unused; struct arch_vdso_time_data arch_data; -}; +} ____cacheline_aligned; /** * struct vdso_rng_data - vdso RNG state information -- 2.47.2