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random: remove dead code left over from blocking pool

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Remove some dead code that was left over following commit 90ea1c6436
("random: remove the blocking pool").

Cc: linux-crypto@vger.kernel.org
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2021-03-21 22:14:00 -07:00 committed by Herbert Xu
parent a181e0fdb2
commit 118a4417e1
2 changed files with 3 additions and 97 deletions
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17
drivers/char/random.c
View file

@ -500,7 +500,6 @@ struct entropy_store {
unsigned short add_ptr;
unsigned short input_rotate;
int entropy_count;
unsigned int initialized:1;
unsigned int last_data_init:1;
__u8 last_data[EXTRACT_SIZE];
};
@ -660,7 +659,7 @@ static void process_random_ready_list(void)
*/
static void credit_entropy_bits(struct entropy_store *r, int nbits)
{
int entropy_count, orig, has_initialized = 0;
int entropy_count, orig;
const int pool_size = r->poolinfo->poolfracbits;
int nfrac = nbits << ENTROPY_SHIFT;
@ -717,23 +716,14 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits)
if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
goto retry;
if (has_initialized) {
r->initialized = 1;
kill_fasync(&fasync, SIGIO, POLL_IN);
}
trace_credit_entropy_bits(r->name, nbits,
entropy_count >> ENTROPY_SHIFT, _RET_IP_);
if (r == &input_pool) {
int entropy_bits = entropy_count >> ENTROPY_SHIFT;
if (crng_init < 2) {
if (entropy_bits < 128)
return;
if (crng_init < 2 && entropy_bits >= 128)
crng_reseed(&primary_crng, r);
entropy_bits = ENTROPY_BITS(r);
}
}
}
@ -1372,8 +1362,7 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
}
/*
* This function does the actual extraction for extract_entropy and
* extract_entropy_user.
* This function does the actual extraction for extract_entropy.
*
* Note: we assume that .poolwords is a multiple of 16 words.
*/

83
include/trace/events/random.h
View file

@ -85,28 +85,6 @@ TRACE_EVENT(credit_entropy_bits,
__entry->entropy_count, (void *)__entry->IP)
);
TRACE_EVENT(push_to_pool,
TP_PROTO(const char *pool_name, int pool_bits, int input_bits),
TP_ARGS(pool_name, pool_bits, input_bits),
TP_STRUCT__entry(
__field( const char *, pool_name )
__field( int, pool_bits )
__field( int, input_bits )
),
TP_fast_assign(
__entry->pool_name = pool_name;
__entry->pool_bits = pool_bits;
__entry->input_bits = input_bits;
),
TP_printk("%s: pool_bits %d input_pool_bits %d",
__entry->pool_name, __entry->pool_bits,
__entry->input_bits)
);
TRACE_EVENT(debit_entropy,
TP_PROTO(const char *pool_name, int debit_bits),
@ -161,35 +139,6 @@ TRACE_EVENT(add_disk_randomness,
MINOR(__entry->dev), __entry->input_bits)
);
TRACE_EVENT(xfer_secondary_pool,
TP_PROTO(const char *pool_name, int xfer_bits, int request_bits,
int pool_entropy, int input_entropy),
TP_ARGS(pool_name, xfer_bits, request_bits, pool_entropy,
input_entropy),
TP_STRUCT__entry(
__field( const char *, pool_name )
__field( int, xfer_bits )
__field( int, request_bits )
__field( int, pool_entropy )
__field( int, input_entropy )
),
TP_fast_assign(
__entry->pool_name = pool_name;
__entry->xfer_bits = xfer_bits;
__entry->request_bits = request_bits;
__entry->pool_entropy = pool_entropy;
__entry->input_entropy = input_entropy;
),
TP_printk("pool %s xfer_bits %d request_bits %d pool_entropy %d "
"input_entropy %d", __entry->pool_name, __entry->xfer_bits,
__entry->request_bits, __entry->pool_entropy,
__entry->input_entropy)
);
DECLARE_EVENT_CLASS(random__get_random_bytes,
TP_PROTO(int nbytes, unsigned long IP),
@ -253,38 +202,6 @@ DEFINE_EVENT(random__extract_entropy, extract_entropy,
TP_ARGS(pool_name, nbytes, entropy_count, IP)
);
DEFINE_EVENT(random__extract_entropy, extract_entropy_user,
TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
unsigned long IP),
TP_ARGS(pool_name, nbytes, entropy_count, IP)
);
TRACE_EVENT(random_read,
TP_PROTO(int got_bits, int need_bits, int pool_left, int input_left),
TP_ARGS(got_bits, need_bits, pool_left, input_left),
TP_STRUCT__entry(
__field( int, got_bits )
__field( int, need_bits )
__field( int, pool_left )
__field( int, input_left )
),
TP_fast_assign(
__entry->got_bits = got_bits;
__entry->need_bits = need_bits;
__entry->pool_left = pool_left;
__entry->input_left = input_left;
),
TP_printk("got_bits %d still_needed_bits %d "
"blocking_pool_entropy_left %d input_entropy_left %d",
__entry->got_bits, __entry->got_bits, __entry->pool_left,
__entry->input_left)
);
TRACE_EVENT(urandom_read,
TP_PROTO(int got_bits, int pool_left, int input_left),