linux-kernel - [PATCH] crypto: lib - remove unneeded selection of XOR

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Message-Id: <20220826050456.101321-1-ebiggers@kernel.org>
Date:   Thu, 25 Aug 2022 22:04:56 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-crypto@...r.kernel.org
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "Jason A . Donenfeld " <Jason@...c4.com>,
        "Justin M . Forbes" <jforbes@...oraproject.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] crypto: lib - remove unneeded selection of XOR_BLOCKS

From: Eric Biggers <ebiggers@...gle.com>

CRYPTO_LIB_CHACHA_GENERIC doesn't need to select XOR_BLOCKS.  It perhaps
was thought that it's needed for __crypto_xor, but that's not the case.

Enabling XOR_BLOCKS is problematic because the XOR_BLOCKS code runs a
benchmark when it is initialized.  That causes a boot time regression on
systems that didn't have it enabled before.

Therefore, remove this unnecessary and problematic selection.

Fixes: e56e18985596 ("lib/crypto: add prompts back to crypto libraries")
Cc: stable@...r.kernel.org
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---

I've separated this fix out from the larger patch
https://lore.kernel.org/r/20220725183636.97326-3-ebiggers@kernel.org
that is currently queued in cryptodev.

 lib/crypto/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig
index 9ff549f63540fa..47816af9a9d7e1 100644
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -33,7 +33,6 @@ config CRYPTO_ARCH_HAVE_LIB_CHACHA

 config CRYPTO_LIB_CHACHA_GENERIC
 	tristate
-	select XOR_BLOCKS
 	help
 	  This symbol can be depended upon by arch implementations of the
 	  ChaCha library interface that require the generic code as a

base-commit: 4c612826bec1441214816827979b62f84a097e91
-- 
2.37.2