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random: remove unused tracepoints

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These explicit tracepoints aren't really used and show sign of aging.
It's work to keep these up to date, and before I attempted to keep them
up to date, they weren't up to date, which indicates that they're not
really used. These days there are better ways of introspecting anyway.

Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2022-02-10 16:40:44 +01:00
parent 95e6060c20
commit 14c174633f
3 changed files with 3 additions and 241 deletions
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30
drivers/char/random.c
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@@ -237,9 +237,6 @@
#include <asm/irq_regs.h>
#include <asm/io.h>
#define CREATE_TRACE_POINTS
#include <trace/events/random.h>
enum {
POOL_BITS = BLAKE2S_HASH_SIZE * 8,
POOL_MIN_BITS = POOL_BITS /* No point in settling for less. */
@@ -315,7 +312,6 @@ static void mix_pool_bytes(const void *in, size_t nbytes)
{
unsigned long flags;
trace_mix_pool_bytes(nbytes, _RET_IP_);
spin_lock_irqsave(&input_pool.lock, flags);
_mix_pool_bytes(in, nbytes);
spin_unlock_irqrestore(&input_pool.lock, flags);
@@ -389,8 +385,6 @@ static void credit_entropy_bits(size_t nbits)
entropy_count = min_t(unsigned int, POOL_BITS, orig + add);
} while (cmpxchg(&input_pool.entropy_count, orig, entropy_count) != orig);
trace_credit_entropy_bits(nbits, entropy_count, _RET_IP_);
if (crng_init < 2 && entropy_count >= POOL_MIN_BITS)
crng_reseed();
}
@@ -721,7 +715,6 @@ void add_device_randomness(const void *buf, size_t size)
if (!crng_ready() && size)
crng_slow_load(buf, size);
trace_add_device_randomness(size, _RET_IP_);
spin_lock_irqsave(&input_pool.lock, flags);
_mix_pool_bytes(buf, size);
_mix_pool_bytes(&time, sizeof(time));
@@ -800,7 +793,6 @@ void add_input_randomness(unsigned int type, unsigned int code,
last_value = value;
add_timer_randomness(&input_timer_state,
(type << 4) ^ code ^ (code >> 4) ^ value);
trace_add_input_randomness(input_pool.entropy_count);
}
EXPORT_SYMBOL_GPL(add_input_randomness);
@@ -880,7 +872,6 @@ void add_disk_randomness(struct gendisk *disk)
return;
/* first major is 1, so we get >= 0x200 here */
add_timer_randomness(disk->random, 0x100 + disk_devt(disk));
trace_add_disk_randomness(disk_devt(disk), input_pool.entropy_count);
}
EXPORT_SYMBOL_GPL(add_disk_randomness);
#endif
@@ -905,8 +896,6 @@ static void extract_entropy(void *buf, size_t nbytes)
} block;
size_t i;
trace_extract_entropy(nbytes, input_pool.entropy_count);
for (i = 0; i < ARRAY_SIZE(block.rdseed); ++i) {
if (!arch_get_random_seed_long(&block.rdseed[i]) &&
!arch_get_random_long(&block.rdseed[i]))
@@ -978,8 +967,6 @@ static void _get_random_bytes(void *buf, size_t nbytes)
u8 tmp[CHACHA_BLOCK_SIZE];
size_t len;
trace_get_random_bytes(nbytes, _RET_IP_);
if (!nbytes)
return;
@@ -1176,7 +1163,6 @@ size_t __must_check get_random_bytes_arch(void *buf, size_t nbytes)
size_t left = nbytes;
u8 *p = buf;
trace_get_random_bytes_arch(left, _RET_IP_);
while (left) {
unsigned long v;
size_t chunk = min_t(size_t, left, sizeof(unsigned long));
@@ -1260,16 +1246,6 @@ void rand_initialize_disk(struct gendisk *disk)
}
#endif
static ssize_t urandom_read_nowarn(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
ssize_t ret;
ret = get_random_bytes_user(buf, nbytes);
trace_urandom_read(nbytes, input_pool.entropy_count);
return ret;
}
static ssize_t urandom_read(struct file *file, char __user *buf, size_t nbytes,
loff_t *ppos)
{
@@ -1282,7 +1258,7 @@ static ssize_t urandom_read(struct file *file, char __user *buf, size_t nbytes,
current->comm, nbytes);
}
return urandom_read_nowarn(file, buf, nbytes, ppos);
return get_random_bytes_user(buf, nbytes);
}
static ssize_t random_read(struct file *file, char __user *buf, size_t nbytes,
@@ -1293,7 +1269,7 @@ static ssize_t random_read(struct file *file, char __user *buf, size_t nbytes,
ret = wait_for_random_bytes();
if (ret != 0)
return ret;
return urandom_read_nowarn(file, buf, nbytes, ppos);
return get_random_bytes_user(buf, nbytes);
}
static __poll_t random_poll(struct file *file, poll_table *wait)
@@ -1454,7 +1430,7 @@ SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count, unsigned int,
if (unlikely(ret))
return ret;
}
return urandom_read_nowarn(NULL, buf, count, NULL);
return get_random_bytes_user(buf, count);
}
/********************************************************************