linux-kernel - [PATCH 5.4 055/240] random: remove unused OUTPUT

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Date:   Mon, 20 Jun 2022 14:49:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 5.4 055/240] random: remove unused OUTPUT_POOL constants

From: "Jason A. Donenfeld" <Jason@...c4.com>

commit 0f63702718c91d89c922081ac1e6baeddc2d8b1a upstream.

We no longer have an output pool. Rather, we have just a wakeup bits
threshold for /dev/random reads, presumably so that processes don't
hang. This value, random_write_wakeup_bits, is configurable anyway. So
all the no longer usefully named OUTPUT_POOL constants were doing was
setting a reasonable default for random_write_wakeup_bits. This commit
gets rid of the constants and just puts it all in the default value of
random_write_wakeup_bits.

Reviewed-by: Dominik Brodowski <linux@...inikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/char/random.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -363,8 +363,6 @@
  */
 #define INPUT_POOL_SHIFT	12
 #define INPUT_POOL_WORDS	(1 << (INPUT_POOL_SHIFT-5))
-#define OUTPUT_POOL_SHIFT	10
-#define OUTPUT_POOL_WORDS	(1 << (OUTPUT_POOL_SHIFT-5))
 #define EXTRACT_SIZE		(BLAKE2S_HASH_SIZE / 2)
 
 /*
@@ -382,7 +380,7 @@
  * should wake up processes which are selecting or polling on write
  * access to /dev/random.
  */
-static int random_write_wakeup_bits = 28 * OUTPUT_POOL_WORDS;
+static int random_write_wakeup_bits = 28 * (1 << 5);
 
 /*
  * Originally, we used a primitive polynomial of degree .poolwords