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Subject[PATCH 4.14 045/237] random: avoid warnings for !CONFIG_NUMA builds
From: Mark Rutland <>

commit ab9a7e27044b87ff2be47b8f8e095400e7fccc44 upstream.

As crng_initialize_secondary() is only called by do_numa_crng_init(),
and the latter is under ifdeffery for CONFIG_NUMA, when CONFIG_NUMA is
not selected the compiler will warn that the former is unused:

| drivers/char/random.c:820:13: warning: 'crng_initialize_secondary' defined but not used [-Wunused-function]
| 820 | static void crng_initialize_secondary(struct crng_state *crng)
| | ^~~~~~~~~~~~~~~~~~~~~~~~~

Stephen reports that this happens for x86_64 noallconfig builds.

We could move crng_initialize_secondary() and crng_init_try_arch() under
the CONFIG_NUMA ifdeffery, but this has the unfortunate property of
separating them from crng_initialize_primary() and
crng_init_try_arch_early() respectively. Instead, let's mark
crng_initialize_secondary() as __maybe_unused.

Fixes: 5cbe0f13b51a ("random: split primary/secondary crng init paths")
Reported-by: Stephen Rothwell <>
Signed-off-by: Mark Rutland <>
Cc: Theodore Ts'o <>
Signed-off-by: Theodore Ts'o <>
Signed-off-by: Jason A. Donenfeld <>
Signed-off-by: Greg Kroah-Hartman <>
drivers/char/random.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -800,7 +800,7 @@ static bool crng_init_try_arch(struct cr
return arch_init;

-static void crng_initialize_secondary(struct crng_state *crng)
+static void __maybe_unused crng_initialize_secondary(struct crng_state *crng)
memcpy(&crng->state[0], "expand 32-byte k", 16);
_get_random_bytes(&crng->state[4], sizeof(__u32) * 12);

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