Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 178/234] random: avoid checking crng_ready() twice in random_init() | Date | Thu, 23 Jun 2022 18:44:05 +0200 |
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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
commit 9b29b6b20376ab64e1b043df6301d8a92378e631 upstream.
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: stable@vger.kernel.org Cc: 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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -834,7 +834,7 @@ int __init random_init(const char *comma if (crng_ready()) crng_reseed(); else if (trust_cpu) - credit_init_bits(arch_bytes * 8); + _credit_init_bits(arch_bytes * 8); return 0; }
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