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random: remove unused tracepoints
commit 14c174633f upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld
Greg Kroah-Hartman
parent
5dde7c4d00
commit
a66146af77
3 changed files with 3 additions and 241 deletions
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@ -237,9 +237,6 @@
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#include <asm/irq_regs.h>
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#include <asm/io.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/random.h>
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enum {
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POOL_BITS = BLAKE2S_HASH_SIZE * 8,
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POOL_MIN_BITS = POOL_BITS /* No point in settling for less. */
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@ -315,7 +312,6 @@ static void mix_pool_bytes(const void *in, size_t nbytes)
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{
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unsigned long flags;
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trace_mix_pool_bytes(nbytes, _RET_IP_);
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spin_lock_irqsave(&input_pool.lock, flags);
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_mix_pool_bytes(in, nbytes);
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spin_unlock_irqrestore(&input_pool.lock, flags);
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@ -389,8 +385,6 @@ static void credit_entropy_bits(size_t nbits)
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entropy_count = min_t(unsigned int, POOL_BITS, orig + add);
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} while (cmpxchg(&input_pool.entropy_count, orig, entropy_count) != orig);
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trace_credit_entropy_bits(nbits, entropy_count, _RET_IP_);
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if (crng_init < 2 && entropy_count >= POOL_MIN_BITS)
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crng_reseed();
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}
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@ -721,7 +715,6 @@ void add_device_randomness(const void *buf, size_t size)
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if (!crng_ready() && size)
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crng_slow_load(buf, size);
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trace_add_device_randomness(size, _RET_IP_);
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spin_lock_irqsave(&input_pool.lock, flags);
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_mix_pool_bytes(buf, size);
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_mix_pool_bytes(&time, sizeof(time));
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@ -800,7 +793,6 @@ void add_input_randomness(unsigned int type, unsigned int code,
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last_value = value;
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add_timer_randomness(&input_timer_state,
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(type << 4) ^ code ^ (code >> 4) ^ value);
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trace_add_input_randomness(input_pool.entropy_count);
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}
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EXPORT_SYMBOL_GPL(add_input_randomness);
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@ -880,7 +872,6 @@ void add_disk_randomness(struct gendisk *disk)
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return;
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/* first major is 1, so we get >= 0x200 here */
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add_timer_randomness(disk->random, 0x100 + disk_devt(disk));
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trace_add_disk_randomness(disk_devt(disk), input_pool.entropy_count);
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}
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EXPORT_SYMBOL_GPL(add_disk_randomness);
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#endif
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@ -905,8 +896,6 @@ static void extract_entropy(void *buf, size_t nbytes)
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} block;
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size_t i;
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trace_extract_entropy(nbytes, input_pool.entropy_count);
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for (i = 0; i < ARRAY_SIZE(block.rdseed); ++i) {
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if (!arch_get_random_seed_long(&block.rdseed[i]) &&
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!arch_get_random_long(&block.rdseed[i]))
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@ -978,8 +967,6 @@ static void _get_random_bytes(void *buf, size_t nbytes)
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u8 tmp[CHACHA_BLOCK_SIZE];
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size_t len;
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trace_get_random_bytes(nbytes, _RET_IP_);
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if (!nbytes)
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return;
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@ -1176,7 +1163,6 @@ size_t __must_check get_random_bytes_arch(void *buf, size_t nbytes)
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size_t left = nbytes;
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u8 *p = buf;
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trace_get_random_bytes_arch(left, _RET_IP_);
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while (left) {
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unsigned long v;
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size_t chunk = min_t(size_t, left, sizeof(unsigned long));
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@ -1260,16 +1246,6 @@ void rand_initialize_disk(struct gendisk *disk)
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}
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#endif
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static ssize_t urandom_read_nowarn(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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ssize_t ret;
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ret = get_random_bytes_user(buf, nbytes);
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trace_urandom_read(nbytes, input_pool.entropy_count);
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return ret;
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}
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static ssize_t urandom_read(struct file *file, char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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@ -1282,7 +1258,7 @@ static ssize_t urandom_read(struct file *file, char __user *buf, size_t nbytes,
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current->comm, nbytes);
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}
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return urandom_read_nowarn(file, buf, nbytes, ppos);
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return get_random_bytes_user(buf, nbytes);
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}
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static ssize_t random_read(struct file *file, char __user *buf, size_t nbytes,
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@ -1293,7 +1269,7 @@ static ssize_t random_read(struct file *file, char __user *buf, size_t nbytes,
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ret = wait_for_random_bytes();
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if (ret != 0)
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return ret;
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return urandom_read_nowarn(file, buf, nbytes, ppos);
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return get_random_bytes_user(buf, nbytes);
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}
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static __poll_t random_poll(struct file *file, poll_table *wait)
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@ -1454,7 +1430,7 @@ SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count, unsigned int,
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if (unlikely(ret))
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return ret;
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}
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return urandom_read_nowarn(NULL, buf, count, NULL);
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return get_random_bytes_user(buf, count);
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}
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/********************************************************************
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@ -1,212 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM random
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#if !defined(_TRACE_RANDOM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_RANDOM_H
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#include <linux/writeback.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(add_device_randomness,
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TP_PROTO(size_t bytes, unsigned long IP),
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TP_ARGS(bytes, IP),
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TP_STRUCT__entry(
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__field(size_t, bytes )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->bytes = bytes;
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__entry->IP = IP;
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),
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TP_printk("bytes %zu caller %pS",
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__entry->bytes, (void *)__entry->IP)
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);
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DECLARE_EVENT_CLASS(random__mix_pool_bytes,
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TP_PROTO(size_t bytes, unsigned long IP),
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TP_ARGS(bytes, IP),
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TP_STRUCT__entry(
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__field(size_t, bytes )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->bytes = bytes;
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__entry->IP = IP;
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),
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TP_printk("input pool: bytes %zu caller %pS",
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__entry->bytes, (void *)__entry->IP)
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);
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DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes,
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TP_PROTO(size_t bytes, unsigned long IP),
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TP_ARGS(bytes, IP)
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);
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DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes_nolock,
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TP_PROTO(int bytes, unsigned long IP),
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TP_ARGS(bytes, IP)
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);
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TRACE_EVENT(credit_entropy_bits,
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TP_PROTO(size_t bits, size_t entropy_count, unsigned long IP),
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TP_ARGS(bits, entropy_count, IP),
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TP_STRUCT__entry(
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__field(size_t, bits )
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__field(size_t, entropy_count )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->bits = bits;
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__entry->entropy_count = entropy_count;
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__entry->IP = IP;
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),
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TP_printk("input pool: bits %zu entropy_count %zu caller %pS",
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__entry->bits, __entry->entropy_count, (void *)__entry->IP)
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);
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TRACE_EVENT(add_input_randomness,
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TP_PROTO(size_t input_bits),
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TP_ARGS(input_bits),
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TP_STRUCT__entry(
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__field(size_t, input_bits )
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),
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TP_fast_assign(
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__entry->input_bits = input_bits;
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),
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TP_printk("input_pool_bits %zu", __entry->input_bits)
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);
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TRACE_EVENT(add_disk_randomness,
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TP_PROTO(dev_t dev, size_t input_bits),
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TP_ARGS(dev, input_bits),
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TP_STRUCT__entry(
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__field(dev_t, dev )
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__field(size_t, input_bits )
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),
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TP_fast_assign(
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__entry->dev = dev;
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__entry->input_bits = input_bits;
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),
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TP_printk("dev %d,%d input_pool_bits %zu", MAJOR(__entry->dev),
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MINOR(__entry->dev), __entry->input_bits)
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);
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DECLARE_EVENT_CLASS(random__get_random_bytes,
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TP_PROTO(size_t nbytes, unsigned long IP),
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TP_ARGS(nbytes, IP),
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TP_STRUCT__entry(
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__field(size_t, nbytes )
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__field(unsigned long, IP )
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),
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TP_fast_assign(
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__entry->nbytes = nbytes;
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__entry->IP = IP;
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),
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TP_printk("nbytes %zu caller %pS", __entry->nbytes, (void *)__entry->IP)
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);
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DEFINE_EVENT(random__get_random_bytes, get_random_bytes,
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TP_PROTO(size_t nbytes, unsigned long IP),
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TP_ARGS(nbytes, IP)
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);
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DEFINE_EVENT(random__get_random_bytes, get_random_bytes_arch,
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TP_PROTO(size_t nbytes, unsigned long IP),
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TP_ARGS(nbytes, IP)
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);
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DECLARE_EVENT_CLASS(random__extract_entropy,
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TP_PROTO(size_t nbytes, size_t entropy_count),
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TP_ARGS(nbytes, entropy_count),
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TP_STRUCT__entry(
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__field( size_t, nbytes )
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__field( size_t, entropy_count )
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),
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TP_fast_assign(
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__entry->nbytes = nbytes;
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__entry->entropy_count = entropy_count;
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),
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TP_printk("input pool: nbytes %zu entropy_count %zu",
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__entry->nbytes, __entry->entropy_count)
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);
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DEFINE_EVENT(random__extract_entropy, extract_entropy,
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TP_PROTO(size_t nbytes, size_t entropy_count),
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TP_ARGS(nbytes, entropy_count)
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);
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TRACE_EVENT(urandom_read,
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TP_PROTO(size_t nbytes, size_t entropy_count),
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TP_ARGS(nbytes, entropy_count),
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TP_STRUCT__entry(
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__field( size_t, nbytes )
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__field( size_t, entropy_count )
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),
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TP_fast_assign(
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__entry->nbytes = nbytes;
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__entry->entropy_count = entropy_count;
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),
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TP_printk("reading: nbytes %zu entropy_count %zu",
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__entry->nbytes, __entry->entropy_count)
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);
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TRACE_EVENT(prandom_u32,
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TP_PROTO(unsigned int ret),
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TP_ARGS(ret),
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TP_STRUCT__entry(
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__field( unsigned int, ret)
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),
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TP_fast_assign(
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__entry->ret = ret;
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),
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TP_printk("ret=%u" , __entry->ret)
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);
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#endif /* _TRACE_RANDOM_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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@ -41,7 +41,6 @@
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include <trace/events/random.h>
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/**
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* prandom_u32_state - seeded pseudo-random number generator.
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@ -387,7 +386,6 @@ u32 prandom_u32(void)
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struct siprand_state *state = get_cpu_ptr(&net_rand_state);
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u32 res = siprand_u32(state);
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trace_prandom_u32(res);
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put_cpu_ptr(&net_rand_state);
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return res;
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}
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