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Message-Id: <20210712120703.53661-1-broonie@kernel.org>
Date: Mon, 12 Jul 2021 13:07:03 +0100
From: Mark Brown <broonie@...nel.org>
To: tytso@....edu
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
Mark Brown <broonie@...nel.org>
Subject: [PATCH] random: Document add_hwgenerator_randomness() with other input functions
The section at the top of random.c which documents the input functions
available does not document add_hwgenerator_randomness() which might lead
a reader to overlook it. Add a brief note about it.
Signed-off-by: Mark Brown <broonie@...nel.org>
---
drivers/char/random.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 605969ed0f96..456a4f43d935 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -228,6 +228,14 @@
* particular randomness source. They do this by keeping track of the
* first and second order deltas of the event timings.
*
+ * There is also an interface for true hardware RNGs:
+ *
+ * void add_hwgenerator_randomness(const char *buffer, size_t count,
+ * size_t entropy);
+ *
+ * This will credit entropy as specified by the caller, if the entropy
+ * pool is full it will block until more entropy is needed.
+ *
* Ensuring unpredictability at system startup
* ============================================
*
--
2.20.1
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