[patch 20/38] kasan: sw_tags: Replace get_cycles() by random_get_entropy()

[Thomas Gleixner]

Seeding the random state with get_cycles() is functionally equivalent on
the architectures which provide get_cycles(), but it does not make sense
semantically.

Use random_get_entropy() instead, which is the proper interface.

This is part of a larger effort to remove get_cycles() usage from
non-architecture code.

Signed-off-by: Thomas Gleixner <tglx at kernel.org>
Cc: Andrey Ryabinin <ryabinin.a.a at gmail.com>
Cc: kasan-dev at googlegroups.com
---
 mm/kasan/sw_tags.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -41,7 +41,7 @@ void __init kasan_init_sw_tags(void)
 	int cpu;
 
 	for_each_possible_cpu(cpu)
-		per_cpu(prng_state, cpu) = (u32)get_cycles();
+		per_cpu(prng_state, cpu) = (u32)random_get_entropy();
 
 	kasan_init_tags();
 	kasan_enable();