[PATCH 1/2] random: Omit double-printing ratelimit messages

[Dmitry Safonov]

Currently "suppressed" messages will be printed once in a second for
unseeded/urandom warnings, but there is already custom message which
says how many warnings are missing. So, let's skip suppressed messages
until crng_init == 2.

P.S.: not sure if there is a value in custom messages, maybe we can just
remove them instead.

Cc: Arnd Bergmann <a...@arndb.de>
Cc: Theodore Ts'o <ty...@mit.edu>
Signed-off-by: Dmitry Safonov <d...@arista.com>
---
 drivers/char/random.c     |  6 ++++--
 include/linux/ratelimit.h | 10 +++++++---
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index cd888d4ee605..c1c40c7ed0e8 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -440,9 +440,9 @@ static void process_random_ready_list(void);
 static void _get_random_bytes(void *buf, int nbytes);
 
 static struct ratelimit_state unseeded_warning =
-       RATELIMIT_STATE_INIT("warn_unseeded_randomness", HZ, 3);
+       RATELIMIT_STATE_INIT_FLAGS("warn_unseeded_randomness", HZ, 3, 
RATELIMIT_MSG_ON_RELEASE);
 static struct ratelimit_state urandom_warning =
-       RATELIMIT_STATE_INIT("warn_urandom_randomness", HZ, 3);
+       RATELIMIT_STATE_INIT_FLAGS("warn_urandom_randomness", HZ, 3, 
RATELIMIT_MSG_ON_RELEASE);
 
 static int ratelimit_disable __read_mostly;
 
@@ -949,12 +949,14 @@ static void crng_reseed(struct crng_state *crng, struct 
entropy_store *r)
                                  unseeded_warning.missed);
                        unseeded_warning.missed = 0;
                }
+               unseeded_warning.flags = 0;
                if (urandom_warning.missed) {
                        pr_notice("random: %d urandom warning(s) missed "
                                  "due to ratelimiting\n",
                                  urandom_warning.missed);
                        urandom_warning.missed = 0;
                }
+               urandom_warning.flags = 0;
        }
 }
 
diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h
index 8ddf79e9207a..e9a14a7641e0 100644
--- a/include/linux/ratelimit.h
+++ b/include/linux/ratelimit.h
@@ -23,12 +23,16 @@ struct ratelimit_state {
        unsigned long   flags;
 };
 
-#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) {                
\
+#define RATELIMIT_STATE_INIT_FLAGS(name, _interval, _burst, _flags) {  \
                .lock           = __RAW_SPIN_LOCK_UNLOCKED(name.lock),  \
-               .interval       = interval_init,                        \
-               .burst          = burst_init,                           \
+               .interval       = _interval,                            \
+               .burst          = _burst,                               \
+               .flags          = _flags,                               \
        }
 
+#define RATELIMIT_STATE_INIT(name, _interval, _burst)                  \
+       RATELIMIT_STATE_INIT_FLAGS(name, _interval, _burst, 0)
+
 #define RATELIMIT_STATE_INIT_DISABLED                                  \
        RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)
 
-- 
2.13.6