linux-kernel - [PATCH 3/3] crypto: tcrypt

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Message-Id: <20221219203733.3063192-4-elliott@hpe.com>
Date:   Mon, 19 Dec 2022 14:37:33 -0600
From:   Robert Elliott <elliott@....com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Robert Elliott <elliott@....com>
Subject: [PATCH 3/3] crypto: tcrypt - yield at end of test

Call cond_resched() to let the scheduler reschedule the
CPU at the end of each test pass.

If the kernel is configured with CONFIG_PREEMPT_NONE=y (or
preempt=none is used on the kernel command line), the only
time the scheduler will intervene is when cond_resched()
is called. So, repeated calls to
	modprobe tcrypt mode=<something>

hold the CPU for a long time.

Signed-off-by: Robert Elliott <elliott@....com>
---
 crypto/tcrypt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index 3e9e4adeef02..916bddbf4e75 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -3027,6 +3027,7 @@ static int do_test(const char *alg, u32 type, u32 mask, int m, u32 num_mb)
 
 	}
 
+	cond_resched();
 	return ret;
 }
 
-- 
2.38.1