From c7fe982bc2e4448694ebcccccb16d6c498c10c39 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Tue, 28 Sep 2021 13:54:01 +0200 Subject: [PATCH 026/158] 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 Link: https://lore.kernel.org/r/20210928115401.441339-1-bigeasy@linutronix.de --- crypto/testmgr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-5.15.19-rt29/crypto/testmgr.c =================================================================== --- linux-5.15.19-rt29.orig/crypto/testmgr.c +++ linux-5.15.19-rt29/crypto/testmgr.c @@ -1061,14 +1061,14 @@ static void generate_random_testvec_conf 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(); } /*