[PATCH 4.14 078/237] random: rather than entropy_store abstraction, use global

From: "Jason A. Donenfeld" Jason@zx2c4.com

commit 90ed1e67e896cc8040a523f8428fc02f9b164394 upstream.

Originally, the RNG used several pools, so having things abstracted out over a generic entropy_store object made sense. These days, there's only one input pool, and then an uneven mix of usage via the abstraction and usage via &input_pool. Rather than this uneasy mixture, just get rid of the abstraction entirely and have things always use the global. This simplifies the code and makes reading it a bit easier.

Reviewed-by: Dominik Brodowski linux@dominikbrodowski.net Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/char/random.c | 219 ++++++++++++++++++------------------------ include/trace/events/random.h | 56 ++++------ 2 files changed, 117 insertions(+), 158 deletions(-)

--- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -375,7 +375,7 @@ * credit_entropy_bits() needs to be 64 bits wide. */ #define ENTROPY_SHIFT 3 -#define ENTROPY_BITS(r) ((r)->entropy_count >> ENTROPY_SHIFT) +#define ENTROPY_BITS() (input_pool.entropy_count >> ENTROPY_SHIFT)

/* * If the entropy count falls under this number of bits, then we @@ -505,33 +505,27 @@ MODULE_PARM_DESC(ratelimit_disable, "Dis * **********************************************************************/

-struct entropy_store; -struct entropy_store { +static u32 input_pool_data[INPUT_POOL_WORDS] __latent_entropy; + +static struct { /* read-only data: */ u32 *pool; - const char *name;

/* read-write data: */ spinlock_t lock; u16 add_ptr; u16 input_rotate; int entropy_count; -}; - -static ssize_t extract_entropy(struct entropy_store *r, void *buf, - size_t nbytes, int min); -static ssize_t _extract_entropy(struct entropy_store *r, void *buf, - size_t nbytes); - -static void crng_reseed(struct crng_state *crng, struct entropy_store *r); -static u32 input_pool_data[INPUT_POOL_WORDS] __latent_entropy; - -static struct entropy_store input_pool = { - .name = "input", +} input_pool = { .lock = __SPIN_LOCK_UNLOCKED(input_pool.lock), .pool = input_pool_data };

+static ssize_t extract_entropy(void *buf, size_t nbytes, int min); +static ssize_t _extract_entropy(void *buf, size_t nbytes); + +static void crng_reseed(struct crng_state *crng, bool use_input_pool); + static u32 const twist_table[8] = { 0x00000000, 0x3b6e20c8, 0x76dc4190, 0x4db26158, 0xedb88320, 0xd6d6a3e8, 0x9b64c2b0, 0xa00ae278 }; @@ -546,16 +540,15 @@ static u32 const twist_table[8] = { * it's cheap to do so and helps slightly in the expected case where * the entropy is concentrated in the low-order bits. */ -static void _mix_pool_bytes(struct entropy_store *r, const void *in, - int nbytes) +static void _mix_pool_bytes(const void *in, int nbytes) { unsigned long i; int input_rotate; const u8 *bytes = in; u32 w;

- input_rotate = r->input_rotate; - i = r->add_ptr; + input_rotate = input_pool.input_rotate; + i = input_pool.add_ptr;

/* mix one byte at a time to simplify size handling and churn faster */ while (nbytes--) { @@ -563,15 +556,15 @@ static void _mix_pool_bytes(struct entro i = (i - 1) & POOL_WORDMASK;

/* XOR in the various taps */ - w ^= r->pool[i]; - w ^= r->pool[(i + POOL_TAP1) & POOL_WORDMASK]; - w ^= r->pool[(i + POOL_TAP2) & POOL_WORDMASK]; - w ^= r->pool[(i + POOL_TAP3) & POOL_WORDMASK]; - w ^= r->pool[(i + POOL_TAP4) & POOL_WORDMASK]; - w ^= r->pool[(i + POOL_TAP5) & POOL_WORDMASK]; + w ^= input_pool.pool[i]; + w ^= input_pool.pool[(i + POOL_TAP1) & POOL_WORDMASK]; + w ^= input_pool.pool[(i + POOL_TAP2) & POOL_WORDMASK]; + w ^= input_pool.pool[(i + POOL_TAP3) & POOL_WORDMASK]; + w ^= input_pool.pool[(i + POOL_TAP4) & POOL_WORDMASK]; + w ^= input_pool.pool[(i + POOL_TAP5) & POOL_WORDMASK];

/* Mix the result back in with a twist */ - r->pool[i] = (w >> 3) ^ twist_table[w & 7]; + input_pool.pool[i] = (w >> 3) ^ twist_table[w & 7];

/* * Normally, we add 7 bits of rotation to the pool. @@ -582,26 +575,24 @@ static void _mix_pool_bytes(struct entro input_rotate = (input_rotate + (i ? 7 : 14)) & 31; }

- r->input_rotate = input_rotate; - r->add_ptr = i; + input_pool.input_rotate = input_rotate; + input_pool.add_ptr = i; }

-static void __mix_pool_bytes(struct entropy_store *r, const void *in, - int nbytes) +static void __mix_pool_bytes(const void *in, int nbytes) { - trace_mix_pool_bytes_nolock(r->name, nbytes, _RET_IP_); - _mix_pool_bytes(r, in, nbytes); + trace_mix_pool_bytes_nolock(nbytes, _RET_IP_); + _mix_pool_bytes(in, nbytes); }

-static void mix_pool_bytes(struct entropy_store *r, const void *in, - int nbytes) +static void mix_pool_bytes(const void *in, int nbytes) { unsigned long flags;

- trace_mix_pool_bytes(r->name, nbytes, _RET_IP_); - spin_lock_irqsave(&r->lock, flags); - _mix_pool_bytes(r, in, nbytes); - spin_unlock_irqrestore(&r->lock, 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); }

struct fast_pool { @@ -663,16 +654,16 @@ static void process_random_ready_list(vo * Use credit_entropy_bits_safe() if the value comes from userspace * or otherwise should be checked for extreme values. */ -static void credit_entropy_bits(struct entropy_store *r, int nbits) +static void credit_entropy_bits(int nbits) { - int entropy_count, orig; + int entropy_count, entropy_bits, orig; int nfrac = nbits << ENTROPY_SHIFT;

if (!nbits) return;

retry: - entropy_count = orig = ACCESS_ONCE(r->entropy_count); + entropy_count = orig = READ_ONCE(input_pool.entropy_count); if (nfrac < 0) { /* Debit */ entropy_count += nfrac; @@ -713,26 +704,21 @@ retry: }

if (WARN_ON(entropy_count < 0)) { - pr_warn("negative entropy/overflow: pool %s count %d\n", - r->name, entropy_count); + pr_warn("negative entropy/overflow: count %d\n", entropy_count); entropy_count = 0; } else if (entropy_count > POOL_FRACBITS) entropy_count = POOL_FRACBITS; - if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig) + if (cmpxchg(&input_pool.entropy_count, orig, entropy_count) != orig) goto retry;

- trace_credit_entropy_bits(r->name, nbits, - entropy_count >> ENTROPY_SHIFT, _RET_IP_); + trace_credit_entropy_bits(nbits, entropy_count >> ENTROPY_SHIFT, _RET_IP_);

- if (r == &input_pool) { - int entropy_bits = entropy_count >> ENTROPY_SHIFT; - - if (crng_init < 2 && entropy_bits >= 128) - crng_reseed(&primary_crng, r); - } + entropy_bits = entropy_count >> ENTROPY_SHIFT; + if (crng_init < 2 && entropy_bits >= 128) + crng_reseed(&primary_crng, true); }

-static int credit_entropy_bits_safe(struct entropy_store *r, int nbits) +static int credit_entropy_bits_safe(int nbits) { if (nbits < 0) return -EINVAL; @@ -740,7 +726,7 @@ static int credit_entropy_bits_safe(stru /* Cap the value to avoid overflows */ nbits = min(nbits, POOL_BITS);

- credit_entropy_bits(r, nbits); + credit_entropy_bits(nbits); return 0; }

@@ -817,7 +803,7 @@ static void crng_initialize_secondary(st

static void __init crng_initialize_primary(struct crng_state *crng) { - _extract_entropy(&input_pool, &crng->state[4], sizeof(u32) * 12); + _extract_entropy(&crng->state[4], sizeof(u32) * 12); if (crng_init_try_arch_early(crng) && trust_cpu && crng_init < 2) { invalidate_batched_entropy(); numa_crng_init(); @@ -978,7 +964,7 @@ static int crng_slow_load(const u8 *cp, return 1; }

-static void crng_reseed(struct crng_state *crng, struct entropy_store *r) +static void crng_reseed(struct crng_state *crng, bool use_input_pool) { unsigned long flags; int i, num; @@ -987,8 +973,8 @@ static void crng_reseed(struct crng_stat u32 key[8]; } buf;

- if (r) { - num = extract_entropy(r, &buf, 32, 16); + if (use_input_pool) { + num = extract_entropy(&buf, 32, 16); if (num == 0) return; } else { @@ -1019,8 +1005,7 @@ static void _extract_crng(struct crng_st init_time = READ_ONCE(crng->init_time); if (time_after(READ_ONCE(crng_global_init_time), init_time) || time_after(jiffies, init_time + CRNG_RESEED_INTERVAL)) - crng_reseed(crng, crng == &primary_crng ? - &input_pool : NULL); + crng_reseed(crng, crng == &primary_crng); } spin_lock_irqsave(&crng->lock, flags); chacha20_block(&crng->state[0], out); @@ -1131,8 +1116,8 @@ void add_device_randomness(const void *b

trace_add_device_randomness(size, _RET_IP_); spin_lock_irqsave(&input_pool.lock, flags); - _mix_pool_bytes(&input_pool, buf, size); - _mix_pool_bytes(&input_pool, &time, sizeof(time)); + _mix_pool_bytes(buf, size); + _mix_pool_bytes(&time, sizeof(time)); spin_unlock_irqrestore(&input_pool.lock, flags); } EXPORT_SYMBOL(add_device_randomness); @@ -1151,7 +1136,6 @@ static struct timer_rand_state input_tim */ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) { - struct entropy_store *r; struct { long jiffies; unsigned int cycles; @@ -1162,8 +1146,7 @@ static void add_timer_randomness(struct sample.jiffies = jiffies; sample.cycles = random_get_entropy(); sample.num = num; - r = &input_pool; - mix_pool_bytes(r, &sample, sizeof(sample)); + mix_pool_bytes(&sample, sizeof(sample));

/* * Calculate number of bits of randomness we probably added. @@ -1195,7 +1178,7 @@ static void add_timer_randomness(struct * Round down by 1 bit on general principles, * and limit entropy estimate to 12 bits. */ - credit_entropy_bits(r, min_t(int, fls(delta>>1), 11)); + credit_entropy_bits(min_t(int, fls(delta>>1), 11)); }

void add_input_randomness(unsigned int type, unsigned int code, @@ -1210,7 +1193,7 @@ void add_input_randomness(unsigned int t last_value = value; add_timer_randomness(&input_timer_state, (type << 4) ^ code ^ (code >> 4) ^ value); - trace_add_input_randomness(ENTROPY_BITS(&input_pool)); + trace_add_input_randomness(ENTROPY_BITS()); } EXPORT_SYMBOL_GPL(add_input_randomness);

@@ -1254,7 +1237,6 @@ static u32 get_reg(struct fast_pool *f,

void add_interrupt_randomness(int irq) { - struct entropy_store *r; struct fast_pool *fast_pool = this_cpu_ptr(&irq_randomness); struct pt_regs *regs = get_irq_regs(); unsigned long now = jiffies; @@ -1289,18 +1271,17 @@ void add_interrupt_randomness(int irq) !time_after(now, fast_pool->last + HZ)) return;

- r = &input_pool; - if (!spin_trylock(&r->lock)) + if (!spin_trylock(&input_pool.lock)) return;

fast_pool->last = now; - __mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool)); - spin_unlock(&r->lock); + __mix_pool_bytes(&fast_pool->pool, sizeof(fast_pool->pool)); + spin_unlock(&input_pool.lock);

fast_pool->count = 0;

/* award one bit for the contents of the fast pool */ - credit_entropy_bits(r, 1); + credit_entropy_bits(1); } EXPORT_SYMBOL_GPL(add_interrupt_randomness);

@@ -1311,7 +1292,7 @@ void add_disk_randomness(struct gendisk 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), ENTROPY_BITS(&input_pool)); + trace_add_disk_randomness(disk_devt(disk), ENTROPY_BITS()); } EXPORT_SYMBOL_GPL(add_disk_randomness); #endif @@ -1326,16 +1307,16 @@ EXPORT_SYMBOL_GPL(add_disk_randomness); * This function decides how many bytes to actually take from the * given pool, and also debits the entropy count accordingly. */ -static size_t account(struct entropy_store *r, size_t nbytes, int min) +static size_t account(size_t nbytes, int min) { int entropy_count, orig, have_bytes; size_t ibytes, nfrac;

- BUG_ON(r->entropy_count > POOL_FRACBITS); + BUG_ON(input_pool.entropy_count > POOL_FRACBITS);

/* Can we pull enough? */ retry: - entropy_count = orig = ACCESS_ONCE(r->entropy_count); + entropy_count = orig = READ_ONCE(input_pool.entropy_count); ibytes = nbytes; /* never pull more than available */ have_bytes = entropy_count >> (ENTROPY_SHIFT + 3); @@ -1347,8 +1328,7 @@ retry: ibytes = 0;

if (WARN_ON(entropy_count < 0)) { - pr_warn("negative entropy count: pool %s count %d\n", - r->name, entropy_count); + pr_warn("negative entropy count: count %d\n", entropy_count); entropy_count = 0; } nfrac = ibytes << (ENTROPY_SHIFT + 3); @@ -1357,11 +1337,11 @@ retry: else entropy_count = 0;

- if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig) + if (cmpxchg(&input_pool.entropy_count, orig, entropy_count) != orig) goto retry;

- trace_debit_entropy(r->name, 8 * ibytes); - if (ibytes && ENTROPY_BITS(r) < random_write_wakeup_bits) { + trace_debit_entropy(8 * ibytes); + if (ibytes && ENTROPY_BITS() < random_write_wakeup_bits) { wake_up_interruptible(&random_write_wait); kill_fasync(&fasync, SIGIO, POLL_OUT); } @@ -1374,7 +1354,7 @@ retry: * * Note: we assume that .poolwords is a multiple of 16 words. */ -static void extract_buf(struct entropy_store *r, u8 *out) +static void extract_buf(u8 *out) { struct blake2s_state state __aligned(__alignof__(unsigned long)); u8 hash[BLAKE2S_HASH_SIZE]; @@ -1396,8 +1376,8 @@ static void extract_buf(struct entropy_s }

/* Generate a hash across the pool */ - spin_lock_irqsave(&r->lock, flags); - blake2s_update(&state, (const u8 *)r->pool, POOL_BYTES); + spin_lock_irqsave(&input_pool.lock, flags); + blake2s_update(&state, (const u8 *)input_pool.pool, POOL_BYTES); blake2s_final(&state, hash); /* final zeros out state */

/* @@ -1409,8 +1389,8 @@ static void extract_buf(struct entropy_s * brute-forcing the feedback as hard as brute-forcing the * hash. */ - __mix_pool_bytes(r, hash, sizeof(hash)); - spin_unlock_irqrestore(&r->lock, flags); + __mix_pool_bytes(hash, sizeof(hash)); + spin_unlock_irqrestore(&input_pool.lock, flags);

/* Note that EXTRACT_SIZE is half of hash size here, because above * we've dumped the full length back into mixer. By reducing the @@ -1420,14 +1400,13 @@ static void extract_buf(struct entropy_s memzero_explicit(hash, sizeof(hash)); }

-static ssize_t _extract_entropy(struct entropy_store *r, void *buf, - size_t nbytes) +static ssize_t _extract_entropy(void *buf, size_t nbytes) { ssize_t ret = 0, i; u8 tmp[EXTRACT_SIZE];

while (nbytes) { - extract_buf(r, tmp); + extract_buf(tmp); i = min_t(int, nbytes, EXTRACT_SIZE); memcpy(buf, tmp, i); nbytes -= i; @@ -1448,12 +1427,11 @@ static ssize_t _extract_entropy(struct e * The min parameter specifies the minimum amount we can pull before * failing to avoid races that defeat catastrophic reseeding. */ -static ssize_t extract_entropy(struct entropy_store *r, void *buf, - size_t nbytes, int min) +static ssize_t extract_entropy(void *buf, size_t nbytes, int min) { - trace_extract_entropy(r->name, nbytes, ENTROPY_BITS(r), _RET_IP_); - nbytes = account(r, nbytes, min); - return _extract_entropy(r, buf, nbytes); + trace_extract_entropy(nbytes, ENTROPY_BITS(), _RET_IP_); + nbytes = account(nbytes, min); + return _extract_entropy(buf, nbytes); }

#define warn_unseeded_randomness(previous) \ @@ -1538,7 +1516,7 @@ EXPORT_SYMBOL(get_random_bytes); */ static void entropy_timer(unsigned long data) { - credit_entropy_bits(&input_pool, 1); + credit_entropy_bits(1); }

/* @@ -1562,14 +1540,14 @@ static void try_to_generate_entropy(void while (!crng_ready()) { if (!timer_pending(&stack.timer)) mod_timer(&stack.timer, jiffies+1); - mix_pool_bytes(&input_pool, &stack.now, sizeof(stack.now)); + mix_pool_bytes(&stack.now, sizeof(stack.now)); schedule(); stack.now = random_get_entropy(); }

del_timer_sync(&stack.timer); destroy_timer_on_stack(&stack.timer); - mix_pool_bytes(&input_pool, &stack.now, sizeof(stack.now)); + mix_pool_bytes(&stack.now, sizeof(stack.now)); }

/* @@ -1710,26 +1688,24 @@ EXPORT_SYMBOL(get_random_bytes_arch); /* * init_std_data - initialize pool with system data * - * @r: pool to initialize - * * This function clears the pool's entropy count and mixes some system * data into the pool to prepare it for use. The pool is not cleared * as that can only decrease the entropy in the pool. */ -static void __init init_std_data(struct entropy_store *r) +static void __init init_std_data(void) { int i; ktime_t now = ktime_get_real(); unsigned long rv;

- mix_pool_bytes(r, &now, sizeof(now)); + mix_pool_bytes(&now, sizeof(now)); for (i = POOL_BYTES; i > 0; i -= sizeof(rv)) { if (!arch_get_random_seed_long(&rv) && !arch_get_random_long(&rv)) rv = random_get_entropy(); - mix_pool_bytes(r, &rv, sizeof(rv)); + mix_pool_bytes(&rv, sizeof(rv)); } - mix_pool_bytes(r, utsname(), sizeof(*(utsname()))); + mix_pool_bytes(utsname(), sizeof(*(utsname()))); }

/* @@ -1744,7 +1720,7 @@ static void __init init_std_data(struct */ int __init rand_initialize(void) { - init_std_data(&input_pool); + init_std_data(); if (crng_need_final_init) crng_finalize_init(&primary_crng); crng_initialize_primary(&primary_crng); @@ -1781,7 +1757,7 @@ urandom_read_nowarn(struct file *file, c

nbytes = min_t(size_t, nbytes, INT_MAX >> (ENTROPY_SHIFT + 3)); ret = extract_crng_user(buf, nbytes); - trace_urandom_read(8 * nbytes, 0, ENTROPY_BITS(&input_pool)); + trace_urandom_read(8 * nbytes, 0, ENTROPY_BITS()); return ret; }

@@ -1821,13 +1797,13 @@ random_poll(struct file *file, poll_tabl mask = 0; if (crng_ready()) mask |= POLLIN | POLLRDNORM; - if (ENTROPY_BITS(&input_pool) < random_write_wakeup_bits) + if (ENTROPY_BITS() < random_write_wakeup_bits) mask |= POLLOUT | POLLWRNORM; return mask; }

static int -write_pool(struct entropy_store *r, const char __user *buffer, size_t count) +write_pool(const char __user *buffer, size_t count) { size_t bytes; u32 t, buf[16]; @@ -1849,7 +1825,7 @@ write_pool(struct entropy_store *r, cons count -= bytes; p += bytes;

- mix_pool_bytes(r, buf, bytes); + mix_pool_bytes(buf, bytes); cond_resched(); }

@@ -1861,7 +1837,7 @@ static ssize_t random_write(struct file { size_t ret;

- ret = write_pool(&input_pool, buffer, count); + ret = write_pool(buffer, count); if (ret) return ret;

@@ -1877,7 +1853,7 @@ static long random_ioctl(struct file *f, switch (cmd) { case RNDGETENTCNT: /* inherently racy, no point locking */ - ent_count = ENTROPY_BITS(&input_pool); + ent_count = ENTROPY_BITS(); if (put_user(ent_count, p)) return -EFAULT; return 0; @@ -1886,7 +1862,7 @@ static long random_ioctl(struct file *f, return -EPERM; if (get_user(ent_count, p)) return -EFAULT; - return credit_entropy_bits_safe(&input_pool, ent_count); + return credit_entropy_bits_safe(ent_count); case RNDADDENTROPY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -1896,11 +1872,10 @@ static long random_ioctl(struct file *f, return -EINVAL; if (get_user(size, p++)) return -EFAULT; - retval = write_pool(&input_pool, (const char __user *)p, - size); + retval = write_pool((const char __user *)p, size); if (retval < 0) return retval; - return credit_entropy_bits_safe(&input_pool, ent_count); + return credit_entropy_bits_safe(ent_count); case RNDZAPENTCNT: case RNDCLEARPOOL: /* @@ -1916,7 +1891,7 @@ static long random_ioctl(struct file *f, return -EPERM; if (crng_init < 2) return -ENODATA; - crng_reseed(&primary_crng, &input_pool); + crng_reseed(&primary_crng, true); WRITE_ONCE(crng_global_init_time, jiffies - 1); return 0; default: @@ -2238,11 +2213,9 @@ randomize_page(unsigned long start, unsi void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy) { - struct entropy_store *poolp = &input_pool; - if (unlikely(crng_init == 0)) { size_t ret = crng_fast_load(buffer, count); - mix_pool_bytes(poolp, buffer, ret); + mix_pool_bytes(buffer, ret); count -= ret; buffer += ret; if (!count || crng_init == 0) @@ -2255,9 +2228,9 @@ void add_hwgenerator_randomness(const ch */ wait_event_interruptible(random_write_wait, !system_wq || kthread_should_stop() || - ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits); - mix_pool_bytes(poolp, buffer, count); - credit_entropy_bits(poolp, entropy); + ENTROPY_BITS() <= random_write_wakeup_bits); + mix_pool_bytes(buffer, count); + credit_entropy_bits(entropy); } EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);

--- a/include/trace/events/random.h +++ b/include/trace/events/random.h @@ -28,80 +28,71 @@ TRACE_EVENT(add_device_randomness, );

DECLARE_EVENT_CLASS(random__mix_pool_bytes, - TP_PROTO(const char *pool_name, int bytes, unsigned long IP), + TP_PROTO(int bytes, unsigned long IP),

- TP_ARGS(pool_name, bytes, IP), + TP_ARGS(bytes, IP),

TP_STRUCT__entry( - __field( const char *, pool_name ) __field( int, bytes ) __field(unsigned long, IP ) ),

TP_fast_assign( - __entry->pool_name = pool_name; __entry->bytes = bytes; __entry->IP = IP; ),

- TP_printk("%s pool: bytes %d caller %pS", - __entry->pool_name, __entry->bytes, (void *)__entry->IP) + TP_printk("input pool: bytes %d caller %pS", + __entry->bytes, (void *)__entry->IP) );

DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes, - TP_PROTO(const char *pool_name, int bytes, unsigned long IP), + TP_PROTO(int bytes, unsigned long IP),

- TP_ARGS(pool_name, bytes, IP) + TP_ARGS(bytes, IP) );

DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes_nolock, - TP_PROTO(const char *pool_name, int bytes, unsigned long IP), + TP_PROTO(int bytes, unsigned long IP),

- TP_ARGS(pool_name, bytes, IP) + TP_ARGS(bytes, IP) );

TRACE_EVENT(credit_entropy_bits, - TP_PROTO(const char *pool_name, int bits, int entropy_count, - unsigned long IP), + TP_PROTO(int bits, int entropy_count, unsigned long IP),

- TP_ARGS(pool_name, bits, entropy_count, IP), + TP_ARGS(bits, entropy_count, IP),

TP_STRUCT__entry( - __field( const char *, pool_name ) __field( int, bits ) __field( int, entropy_count ) __field(unsigned long, IP ) ),

TP_fast_assign( - __entry->pool_name = pool_name; __entry->bits = bits; __entry->entropy_count = entropy_count; __entry->IP = IP; ),

- TP_printk("%s pool: bits %d entropy_count %d caller %pS", - __entry->pool_name, __entry->bits, - __entry->entropy_count, (void *)__entry->IP) + TP_printk("input pool: bits %d entropy_count %d caller %pS", + __entry->bits, __entry->entropy_count, (void *)__entry->IP) );

TRACE_EVENT(debit_entropy, - TP_PROTO(const char *pool_name, int debit_bits), + TP_PROTO(int debit_bits),

- TP_ARGS(pool_name, debit_bits), + TP_ARGS( debit_bits),

TP_STRUCT__entry( - __field( const char *, pool_name ) __field( int, debit_bits ) ),

TP_fast_assign( - __entry->pool_name = pool_name; __entry->debit_bits = debit_bits; ),

- TP_printk("%s: debit_bits %d", __entry->pool_name, - __entry->debit_bits) + TP_printk("input pool: debit_bits %d", __entry->debit_bits) );

TRACE_EVENT(add_input_randomness, @@ -170,36 +161,31 @@ DEFINE_EVENT(random__get_random_bytes, g );

DECLARE_EVENT_CLASS(random__extract_entropy, - TP_PROTO(const char *pool_name, int nbytes, int entropy_count, - unsigned long IP), + TP_PROTO(int nbytes, int entropy_count, unsigned long IP),

- TP_ARGS(pool_name, nbytes, entropy_count, IP), + TP_ARGS(nbytes, entropy_count, IP),

TP_STRUCT__entry( - __field( const char *, pool_name ) __field( int, nbytes ) __field( int, entropy_count ) __field(unsigned long, IP ) ),

TP_fast_assign( - __entry->pool_name = pool_name; __entry->nbytes = nbytes; __entry->entropy_count = entropy_count; __entry->IP = IP; ),

- TP_printk("%s pool: nbytes %d entropy_count %d caller %pS", - __entry->pool_name, __entry->nbytes, __entry->entropy_count, - (void *)__entry->IP) + TP_printk("input pool: nbytes %d entropy_count %d caller %pS", + __entry->nbytes, __entry->entropy_count, (void *)__entry->IP) );

DEFINE_EVENT(random__extract_entropy, extract_entropy, - TP_PROTO(const char *pool_name, int nbytes, int entropy_count, - unsigned long IP), + TP_PROTO(int nbytes, int entropy_count, unsigned long IP),

- TP_ARGS(pool_name, nbytes, entropy_count, IP) + TP_ARGS(nbytes, entropy_count, IP) );

TRACE_EVENT(urandom_read,