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crypto: testmgr - Only disable migration in crypto_disable_simd_for_test() 

crypto_disable_simd_for_test() disables preemption in order to receive a
stable per-CPU variable which it needs to modify in order to alter
crypto_simd_usable() results.

This can also be achived by migrate_disable() which forbidds CPU
migrations but allows the task to be preempted. The latter is important
for PREEMPT_RT since operation like skcipher_walk_first() may allocate
memory which must not happen with disabled preemption on PREEMPT_RT.

Use migrate_disable() in crypto_disable_simd_for_test() to achieve a
stable per-CPU pointer.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Sebastian Andrzej Siewior 2021-09-28 13:54:01 +02:00 committed by Herbert Xu
parent 32dfef6f92
commit 82e269ad8a
1 changed files with 2 additions and 2 deletions
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4
crypto/testmgr.c
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@ -1061,14 +1061,14 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
static void crypto_disable_simd_for_test(void)
{
preempt_disable();
migrate_disable();
__this_cpu_write(crypto_simd_disabled_for_test, true);
}
static void crypto_reenable_simd_for_test(void)
{
__this_cpu_write(crypto_simd_disabled_for_test, false);
preempt_enable();
migrate_enable();
}
/*