linux-kernel - [PATCH 4.9 16/54] random32: Restore __latent_entropy attribute on net_rand

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Message-Id: <20201012132630.349516268@linuxfoundation.org>
Date:   Mon, 12 Oct 2020 15:26:38 +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, Willy Tarreau <w@....eu>,
        Emese Revfy <re.emese@...il.com>,
        Thibaut Sautereau <thibaut.sautereau@....gouv.fr>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 16/54] random32: Restore __latent_entropy attribute on net_rand_state

From: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>

[ Upstream commit 09a6b0bc3be793ca8cba580b7992d73e9f68f15d ]

Commit f227e3ec3b5c ("random32: update the net random state on interrupt
and activity") broke compilation and was temporarily fixed by Linus in
83bdc7275e62 ("random32: remove net_rand_state from the latent entropy
gcc plugin") by entirely moving net_rand_state out of the things handled
by the latent_entropy GCC plugin.

>>From what I understand when reading the plugin code, using the
__latent_entropy attribute on a declaration was the wrong part and
simply keeping the __latent_entropy attribute on the variable definition
was the correct fix.

Fixes: 83bdc7275e62 ("random32: remove net_rand_state from the latent entropy gcc plugin")
Acked-by: Willy Tarreau <w@....eu>
Cc: Emese Revfy <re.emese@...il.com>
Signed-off-by: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 lib/random32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/random32.c b/lib/random32.c
index 889dab44bd747..d5c3137d93f49 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -47,7 +47,7 @@ static inline void prandom_state_selftest(void)
 }
 #endif
 
-DEFINE_PER_CPU(struct rnd_state, net_rand_state);
+DEFINE_PER_CPU(struct rnd_state, net_rand_state)  __latent_entropy;
 
 /**
  *	prandom_u32_state - seeded pseudo-random number generator.
-- 
2.25.1