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Date:   Sun, 14 May 2017 16:28:00 +0200
From:   Stephan Müller <>
        "Jason A. Donenfeld" <>
Subject: [PATCH v11 2/5] random: conditionally compile code depending on LRNG

When selecting the LRNG for compilation, disable the legacy /dev/random

The LRNG is a drop-in replacement for the legacy /dev/random which
implements the same in-kernel and user space API. Only the hooks of
/dev/random into other parts of the kernel need to be disabled.

Signed-off-by: Stephan Mueller <>
 include/linux/genhd.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index acff943..2a8d748 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -428,8 +428,13 @@ extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
 /* drivers/char/random.c */
+#define add_disk_randomness(disk) do {} while (0)
+#define rand_initialize_disk(disk) do {} while (0)
 extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
 extern void rand_initialize_disk(struct gendisk *disk);
 static inline sector_t get_start_sect(struct block_device *bdev)

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