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-rw-r--r--arch/s390/include/asm/archrandom.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/s390/include/asm/archrandom.h b/arch/s390/include/asm/archrandom.h
index de61ce562052..5dc712fde3c7 100644
--- a/arch/s390/include/asm/archrandom.h
+++ b/arch/s390/include/asm/archrandom.h
@@ -2,7 +2,7 @@
/*
* Kernel interface for the s390 arch_random_* functions
*
- * Copyright IBM Corp. 2017
+ * Copyright IBM Corp. 2017, 2020
*
* Author: Harald Freudenberger <freude@de.ibm.com>
*
@@ -19,10 +19,13 @@
DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
extern atomic64_t s390_arch_random_counter;
+bool s390_arch_get_random_long(unsigned long *v);
bool s390_arch_random_generate(u8 *buf, unsigned int nbytes);
static inline bool __must_check arch_get_random_long(unsigned long *v)
{
+ if (static_branch_likely(&s390_arch_random_available))
+ return s390_arch_get_random_long(v);
return false;
}

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