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Subject[PATCH 4.14 122/237] random: pull add_hwgenerator_randomness() declaration into random.h
From: "Jason A. Donenfeld" <>

commit b777c38239fec5a528e59f55b379e31b1a187524 upstream.

add_hwgenerator_randomness() is a function implemented and documented
inside of random.c. It is the way that hardware RNGs push data into it.
Therefore, it should be declared in random.h. Otherwise sparse complains

random.c:1137:6: warning: symbol 'add_hwgenerator_randomness' was not declared. Should it be static?

The alternative would be to include hw_random.h into random.c, but that
wouldn't really be good for anything except slowing down compile time.

Cc: Matt Mackall <>
Cc: Theodore Ts'o <>
Acked-by: Herbert Xu <>
Reviewed-by: Eric Biggers <>
Reviewed-by: Dominik Brodowski <>
Signed-off-by: Jason A. Donenfeld <>
Signed-off-by: Greg Kroah-Hartman <>
drivers/char/hw_random/core.c | 1 +
include/linux/hw_random.h | 2 --
include/linux/random.h | 2 ++
3 files changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -15,6 +15,7 @@
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/hw_random.h>
+#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/sched/signal.h>
--- a/include/linux/hw_random.h
+++ b/include/linux/hw_random.h
@@ -59,7 +59,5 @@ extern int devm_hwrng_register(struct de
/** Unregister a Hardware Random Number Generator driver. */
extern void hwrng_unregister(struct hwrng *rng);
extern void devm_hwrng_unregister(struct device *dve, struct hwrng *rng);
-/** Feed random bits into the pool. */
-extern void add_hwgenerator_randomness(const void *buffer, size_t count, size_t entropy);

#endif /* LINUX_HWRANDOM_H_ */
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -32,6 +32,8 @@ static inline void add_latent_entropy(vo
extern void add_input_randomness(unsigned int type, unsigned int code,
unsigned int value) __latent_entropy;
extern void add_interrupt_randomness(int irq) __latent_entropy;
+extern void add_hwgenerator_randomness(const void *buffer, size_t count,
+ size_t entropy);

extern void get_random_bytes(void *buf, size_t nbytes);
extern int wait_for_random_bytes(void);

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