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vdso: Make vdso_time_data cacheline aligned 

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 <anna-maria@linutronix.de>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-3-c1b5c69a166f@linutronix.de
This commit is contained in:
Anna-Maria Behnsen 2025-03-03 12:11:05 +01:00 committed by Thomas Gleixner
parent b69b47a6b5
commit fa8152ca22
1 changed files with 2 additions and 1 deletions
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3
include/vdso/datapage.h
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@ -11,6 +11,7 @@
#include <vdso/align.h> #include <vdso/align.h>
#include <vdso/bits.h> #include <vdso/bits.h>
#include <vdso/cache.h>
#include <vdso/clocksource.h> #include <vdso/clocksource.h>
#include <vdso/ktime.h> #include <vdso/ktime.h>
#include <vdso/limits.h> #include <vdso/limits.h>
@ -126,7 +127,7 @@ struct vdso_time_data {
u32 __unused; u32 __unused;
struct arch_vdso_time_data arch_data; struct arch_vdso_time_data arch_data;
}; } ____cacheline_aligned;
/** /**
* struct vdso_rng_data - vdso RNG state information * struct vdso_rng_data - vdso RNG state information