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Date: Fri, 27 May 2022 10:49:44 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Arnd Bergmann <arnd@...db.de>,
Richard Henderson <rth@...ddle.net>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Matt Turner <mattst88@...il.com>,
"Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 5.17 072/111] alpha: define get_cycles macro for arch-override
From: "Jason A. Donenfeld" <Jason@...c4.com>
commit 1097710bc9660e1e588cf2186a35db3d95c4d258 upstream.
Alpha defines a get_cycles() function, but it does not do the usual
`#define get_cycles get_cycles` dance, making it impossible for generic
code to see if an arch-specific function was defined. While the
get_cycles() ifdef is not currently used, the following timekeeping
patch in this series will depend on the macro existing (or not existing)
when defining random_get_entropy().
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Richard Henderson <rth@...ddle.net>
Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Acked-by: Matt Turner <mattst88@...il.com>
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/alpha/include/asm/timex.h | 1 +
1 file changed, 1 insertion(+)
--- a/arch/alpha/include/asm/timex.h
+++ b/arch/alpha/include/asm/timex.h
@@ -28,5 +28,6 @@ static inline cycles_t get_cycles (void)
__asm__ __volatile__ ("rpcc %0" : "=r"(ret));
return ret;
}
+#define get_cycles get_cycles
#endif
fo {
POOL_BYTES = POOL_WORDS * sizeof(u32),
POOL_BITS = POOL_BYTES * 8,
POOL_BITSHIFT = ilog2(POOL_WORDS) + 5,
- POOL_FRACBITS = POOL_WORDS << (ENTROPY_SHIFT + 5),
+ POOL_FRACBITS = POOL_WORDS << (POOL_ENTROPY_SHIFT + 5),
/* x^128 + x^104 + x^76 + x^51 +x^25 + x + 1 */
POOL_TAP1 = 104,
@@ -650,7 +650,7 @@ static void process_random_ready_list(vo
static void credit_entropy_bits(int nbits)
{
int entropy_count, entropy_bits, orig;
- int nfrac = nbits << ENTROPY_SHIFT;
+ int nfrac = nbits << POOL_ENTROPY_SHIFT;
if (!nbits)
return;
@@ -683,7 +683,7 @@ retry:
* turns no matter how large nbits is.
*/
int pnfrac = nfrac;
- const int s = POOL_BITSHIFT + ENTROPY_SHIFT + 2;
+ const int s = POOL_BITSHIFT + POOL_ENTROPY_SHIFT + 2;
/* The +2 corresponds to the /4 in the denominator */
do {
@@ -704,9 +704,9 @@ retry:
if (cmpxchg(&input_pool.entropy_count, orig, entropy_count) != orig)
goto retry;
- trace_credit_entropy_bits(nbits, entropy_count >> ENTROPY_SHIFT, _RET_IP_);
+ trace_credit_entropy_bits(nbits, entropy_count >> POOL_ENTROPY_SHIFT, _RET_IP_);
- entropy_bits = entropy_count >> ENTROPY_SHIFT;
+ entropy_bits = entropy_count >> POOL_ENTROPY_SHIFT;
if (crng_init < 2 && entropy_bits >= 128)
crng_reseed(&primary_crng, true);
}
@@ -1187,7 +1187,7 @@ 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());
+ trace_add_input_randomness(POOL_ENTROPY_BITS());
}
EXPORT_SYMBOL_GPL(add_input_randomness);
@@ -1286,7 +1286,7 @@ 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());
+ trace_add_disk_randomness(disk_devt(disk), POOL_ENTROPY_BITS());
}
EXPORT_SYMBOL_GPL(add_disk_randomness);
#endif
@@ -1313,7 +1313,7 @@ retry:
entropy_count = orig = READ_ONCE(input_pool.entropy_count);
ibytes = nbytes;
/* never pull more than available */
- have_bytes = entropy_count >> (ENTROPY_SHIFT + 3);
+ have_bytes = entropy_count >> (POOL_ENTROPY_SHIFT + 3);
if (have_bytes < 0)
have_bytes = 0;
@@ -1325,7 +1325,7 @@ retry:
pr_warn("negative entropy count: count %d\n", entropy_count);
entropy_count = 0;
}
- nfrac = ibytes << (ENTROPY_SHIFT + 3);
+ nfrac = ibytes << (POOL_ENTROPY_SHIFT + 3);
if ((size_t) entropy_count > nfrac)
entropy_count -= nfrac;
else
@@ -1335,7 +1335,7 @@ retry:
goto retry;
trace_debit_entropy(8 * ibytes);
- if (ibytes && ENTROPY_BITS() < random_write_wakeup_bits) {
+ if (ibytes && POOL_ENTROPY_BITS() < random_write_wakeup_bits) {
wake_up_interruptible(&random_write_wait);
kill_fasync(&fasync, SIGIO, POLL_OUT);
}
@@ -1423,7 +1423,7 @@ static ssize_t _extract_entropy(void *bu
*/
static ssize_t extract_entropy(void *buf, size_t nbytes, int min)
{
- trace_extract_entropy(nbytes, ENTROPY_BITS(), _RET_IP_);
+ trace_extract_entropy(nbytes, POOL_ENTROPY_BITS(), _RET_IP_);
nbytes = account(nbytes, min);
return _extract_entropy(buf, nbytes);
}
@@ -1749,9 +1749,9 @@ urandom_read_nowarn(struct file *file, c
{
int ret;
- nbytes = min_t(size_t, nbytes, INT_MAX >> (ENTROPY_SHIFT + 3));
+ nbytes = min_t(size_t, nbytes, INT_MAX >> (POOL_ENTROPY_SHIFT + 3));
ret = extract_crng_user(buf, nbytes);
- trace_urandom_read(8 * nbytes, 0, ENTROPY_BITS());
+ trace_urandom_read(8 * nbytes, 0, POOL_ENTROPY_BITS());
return ret;
}
@@ -1791,7 +1791,7 @@ random_poll(struct file *file, poll_tabl
mask = 0;
if (crng_ready())
mask |= EPOLLIN | EPOLLRDNORM;
- if (ENTROPY_BITS() < random_write_wakeup_bits)
+ if (POOL_ENTROPY_BITS() < random_write_wakeup_bits)
mask |= EPOLLOUT | EPOLLWRNORM;
return mask;
}
@@ -1847,7 +1847,7 @@ static long random_ioctl(struct file *f,
switch (cmd) {
case RNDGETENTCNT:
/* inherently racy, no point locking */
- ent_count = ENTROPY_BITS();
+ ent_count = POOL_ENTROPY_BITS();
if (put_user(ent_count, p))
return -EFAULT;
return 0;
@@ -2008,7 +2008,7 @@ static int proc_do_entropy(struct ctl_ta
struct ctl_table fake_table;
int entropy_count;
- entropy_count = *(int *)table->data >> ENTROPY_SHIFT;
+ entropy_count = *(int *)table->data >> POOL_ENTROPY_SHIFT;
fake_table.data = &entropy_count;
fake_table.maxlen = sizeof(entropy_count);
@@ -2227,7 +2227,7 @@ void add_hwgenerator_randomness(const ch
*/
wait_event_interruptible(random_write_wait,
!system_wq || kthread_should_stop() ||
- ENTROPY_BITS() <= random_write_wakeup_bits);
+ POOL_ENTROPY_BITS() <= random_write_wakeup_bits);
mix_pool_bytes(buffer, count);
credit_entropy_bits(entropy);
}
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