From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 64F2718E055; Sun, 3 Nov 2024 22:32:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730673146; cv=none; b=WKlnxRrnG1+XulUDgmtOAP9iJv+/BcRKwvAm80PSmzwNiN/Yfr+UGMhx5sxa/aKUc+yGTuN8naUAOGIihKiN5Ebdocp46pmQOjZCKJe6Zog1Y3t+9jb1JVCsCGjm/zbWfK+al58kjP6bK5FurIkVhPhq+rrSCLKigSIlQXDGCak= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730673146; c=relaxed/simple; bh=tFO0F6yNPt11cX0x9fLuUHzrKqGkpHig/cPtPasc7Zs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lheSrq4TaYfcmJvCF3Yi7+AgndXiRu60TpsD1Oelzkb9l84i57mBwZ13oQf7n+iqVQqgretF8uoE/8CNMiS2H2TEN3ZATxMVSuX1gt9AX7P4r2nbAqCt8rYDAOaWRNYGMY1q0ktDv3WdJMZnQuTbQuu3/u+NWV5gQtCQAKnfTPo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FLEXF5On; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FLEXF5On" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF3C1C4CED6; Sun, 3 Nov 2024 22:32:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730673146; bh=tFO0F6yNPt11cX0x9fLuUHzrKqGkpHig/cPtPasc7Zs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FLEXF5OnjtoHBLz2W1SudB1KfgQeNbVamfWQca0Lr3ls4Ajd6zui8pPZphDG8wGHi LMeOxQgpUfQZBOrr9Xxbh82UmIw4KF07FJGWQHV31qEzfhzAW4QITRvihj6T8dNJwD 7VM4SISyDF+9nWY8v1TcdePZO8vlrUSxuR0C2sAycL5JfMzno08WrlDBIWB428LYwV H74oQ1WRR+qGqF2fzD79IPcenVru6oQPFG/aiSVpU1viylHUP1PVVW0SlpHWBah85+ GLRmjZ4czJdS+k2WUI0O0AY7XjAnn6mserV11No6DhCIo1gKixC/7dgNgepAp/Vyod VKf8STCElVs0g== From: Eric Biggers To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v3 04/18] crypto: crc32 - don't unnecessarily register arch algorithms Date: Sun, 3 Nov 2024 14:31:40 -0800 Message-ID: <20241103223154.136127-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241103223154.136127-1-ebiggers@kernel.org> References: <20241103223154.136127-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Eric Biggers Instead of registering the crc32-$arch and crc32c-$arch algorithms if the arch-specific code was built, only register them when that code was built *and* is not falling back to the base implementation at runtime. This avoids confusing users like btrfs which checks the shash driver name to determine whether it is crc32c-generic. (It would also make sense to change btrfs to test the crc32_optimization flags itself, so that it doesn't have to use the weird hack of parsing the driver name. This change still makes sense either way though.) Signed-off-by: Eric Biggers --- crypto/crc32_generic.c | 8 ++++++-- crypto/crc32c_generic.c | 8 ++++++-- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/crypto/crc32_generic.c b/crypto/crc32_generic.c index cc064ea8240e..783a30b27398 100644 --- a/crypto/crc32_generic.c +++ b/crypto/crc32_generic.c @@ -155,19 +155,23 @@ static struct shash_alg algs[] = {{ .base.cra_ctxsize = sizeof(u32), .base.cra_module = THIS_MODULE, .base.cra_init = crc32_cra_init, }}; +static int num_algs; + static int __init crc32_mod_init(void) { /* register the arch flavor only if it differs from the generic one */ - return crypto_register_shashes(algs, 1 + IS_ENABLED(CONFIG_CRC32_ARCH)); + num_algs = 1 + ((crc32_optimizations() & CRC32_LE_OPTIMIZATION) != 0); + + return crypto_register_shashes(algs, num_algs); } static void __exit crc32_mod_fini(void) { - crypto_unregister_shashes(algs, 1 + IS_ENABLED(CONFIG_CRC32_ARCH)); + crypto_unregister_shashes(algs, num_algs); } subsys_initcall(crc32_mod_init); module_exit(crc32_mod_fini); diff --git a/crypto/crc32c_generic.c b/crypto/crc32c_generic.c index 04b03d825cf4..985da981d6e2 100644 --- a/crypto/crc32c_generic.c +++ b/crypto/crc32c_generic.c @@ -195,19 +195,23 @@ static struct shash_alg algs[] = {{ .base.cra_ctxsize = sizeof(struct chksum_ctx), .base.cra_module = THIS_MODULE, .base.cra_init = crc32c_cra_init, }}; +static int num_algs; + static int __init crc32c_mod_init(void) { /* register the arch flavor only if it differs from the generic one */ - return crypto_register_shashes(algs, 1 + IS_ENABLED(CONFIG_CRC32_ARCH)); + num_algs = 1 + ((crc32_optimizations() & CRC32C_OPTIMIZATION) != 0); + + return crypto_register_shashes(algs, num_algs); } static void __exit crc32c_mod_fini(void) { - crypto_unregister_shashes(algs, 1 + IS_ENABLED(CONFIG_CRC32_ARCH)); + crypto_unregister_shashes(algs, num_algs); } subsys_initcall(crc32c_mod_init); module_exit(crc32c_mod_fini); -- 2.47.0