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From 022a098d5137e264c8f042d52ad3a94bd3df894c Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 28 Sep 2021 13:54:01 +0200
Subject: [PATCH 026/158] crypto: testmgr - Only disable migration in
crypto_disable_simd_for_test()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patches-5.15.10-rt24.tar.xz
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>
Link: https://lore.kernel.org/r/20210928115401.441339-1-bigeasy@linutronix.de
---
crypto/testmgr.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 70f69f0910c9..58eee8eab4bf 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -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();
}
/*
--
2.33.1
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