Commit fa8152ca authored by Anna-Maria Behnsen's avatar Anna-Maria Behnsen Committed by Thomas Gleixner
Browse files

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: default avatarAnna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: default avatarNam Cao <namcao@linutronix.de>
Signed-off-by: default avatarThomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-3-c1b5c69a166f@linutronix.de
parent b69b47a6

include/vdso/datapage.h

+2 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 


#include <vdso/align.h>

#include <vdso/bits.h>

#include <vdso/cache.h>

#include <vdso/clocksource.h>

#include <vdso/ktime.h>

#include <vdso/limits.h>
@@ -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