Messages in this thread Patch in this message | | | From | "Jason A. Donenfeld" <> | Subject | [PATCH] random: avoid checking crng_ready() twice in random_init() | Date | Tue, 7 Jun 2022 12:53:03 +0200 |
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The current flow expands to:
if (crng_ready()) ... else if (...) if (!crng_ready()) ...
The second crng_ready() call is redundant, but can't so easily be optimized out by the compiler.
This commit simplifies that to:
if (crng_ready() ... else if (...) ...
Fixes: 560181c27b58 ("random: move initialization functions out of hot pages") Cc: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- drivers/char/random.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/random.c b/drivers/char/random.c index b691b9d59503..4862d4d3ec49 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -801,7 +801,7 @@ int __init random_init(const char *command_line) if (crng_ready()) crng_reseed(); else if (trust_cpu) - credit_init_bits(arch_bytes * 8); + _credit_init_bits(arch_bytes * 8); used_arch_random = arch_bytes * 8 >= POOL_READY_BITS; WARN_ON(register_pm_notifier(&pm_notifier)); -- 2.35.1
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