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random: remove unused extract_entropy() reserved argument

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This argument is always set to zero, as a result of us not caring about
keeping a certain amount reserved in the pool these days. So just remove
it and cleanup the function signatures.

Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-01-12 15:28:21 +01:00
parent a4bfa9b318
commit 8b2d953b91
1 changed files with 7 additions and 10 deletions
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17
drivers/char/random.c
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@ -519,7 +519,7 @@ struct entropy_store {
};
static ssize_t extract_entropy(struct entropy_store *r, void *buf,
size_t nbytes, int min, int rsvd);
size_t nbytes, int min);
static ssize_t _extract_entropy(struct entropy_store *r, void *buf,
size_t nbytes);
@ -989,7 +989,7 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r)
} buf;
if (r) {
num = extract_entropy(r, &buf, 32, 16, 0);
num = extract_entropy(r, &buf, 32, 16);
if (num == 0)
return;
} else {
@ -1327,8 +1327,7 @@ 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,
int reserved)
static size_t account(struct entropy_store *r, size_t nbytes, int min)
{
int entropy_count, orig, have_bytes;
size_t ibytes, nfrac;
@ -1342,7 +1341,7 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
/* never pull more than available */
have_bytes = entropy_count >> (ENTROPY_SHIFT + 3);
if ((have_bytes -= reserved) < 0)
if (have_bytes < 0)
have_bytes = 0;
ibytes = min_t(size_t, ibytes, have_bytes);
if (ibytes < min)
@ -1448,15 +1447,13 @@ static ssize_t _extract_entropy(struct entropy_store *r, void *buf,
* returns it in a buffer.
*
* The min parameter specifies the minimum amount we can pull before
* failing to avoid races that defeat catastrophic reseeding while the
* reserved parameter indicates how much entropy we must leave in the
* pool after each pull to avoid starving other readers.
* failing to avoid races that defeat catastrophic reseeding.
*/
static ssize_t extract_entropy(struct entropy_store *r, void *buf,
size_t nbytes, int min, int reserved)
size_t nbytes, int min)
{
trace_extract_entropy(r->name, nbytes, ENTROPY_BITS(r), _RET_IP_);
nbytes = account(r, nbytes, min, reserved);
nbytes = account(r, nbytes, min);
return _extract_entropy(r, buf, nbytes);
}