From patchwork Fri Oct 25 19:14:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13851431 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7F33AD149E7 for ; Fri, 25 Oct 2024 19:24:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Gx/NPO77z1DtWpg+Wbv7iCZDKWa05k3zv1GiT7ERGPM=; b=rEhNouKb8qlLY4R8LOFoQxNSMf N0d/7/KPtY3jH0umWzU+c0/GJXK9y3MGyEGlJTvfJVxrs81HCurBTLThZxrJl/J1vw5XW7egyoB5r 4lCaIQvyirv2i3E5bbcwuUKmfw81ALYMd0+qPomQKSEGx3G6VZz/qHoxHc6Mpb9ZKtYpyRBx/dHZz y2tnQ5E4dX5rjV6PJ35AgKyVkhvZcW6OOXESMyJvDWK8RkclAwq2EBN/NSaR2gtN2AJnUmVSMtnsC O0PqbhPbssmSIz947pXLj5pUQ2PX2a1wCArVl9MP+ETjx1zV21DAFEJLiOyQel17dIwE1wIziKa6G mmtglWXQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t4Pv5-00000004yFY-3lzK; Fri, 25 Oct 2024 19:24:23 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t4Pml-00000004vHH-0iXS; Fri, 25 Oct 2024 19:15:49 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id E2FB1A44C37; Fri, 25 Oct 2024 19:13:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 92CA0C4CEF7; Fri, 25 Oct 2024 19:15:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729883746; bh=3ki30lOxrwcmmFT8r/BxBSIWiIgjCokra374LPFdTjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ewf3k1fN8FI5lfS/6w9IFwZ4u6hVpP/Fl0POKQECBxh2jBWAZpuVIzIUxSZROAKf6 BUjn6UW1aFHZHkDdHUd8K46PyIbTrfUHoQVAnyt5ocYS8KAIh7w0dqiIdNyUqxzRXs zyainnf7I542RMLlffmEuRba9rENa8Z7OkVP+DX2ya/xa1MGrdlZVjVq8FQzNJyl/h Mm4tHBFwbQvF4SL1U7JRODcZQsniEHUJfOY3PW1AS/6iECR/HXamD+XEIRJ5Ey1leg 3njI7/DQzTwoOyYlyv6Cw/CUe395fJjoiHorj8UnmtJB+th3baQAp1wmJhGKSKDPWV wa1UzKFgR/x5g== 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 v2 04/18] crypto: crc32 - don't unnecessarily register arch algorithms Date: Fri, 25 Oct 2024 12:14:40 -0700 Message-ID: <20241025191454.72616-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241025191454.72616-1-ebiggers@kernel.org> References: <20241025191454.72616-1-ebiggers@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241025_121547_521234_2DB9500F X-CRM114-Status: GOOD ( 13.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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..cecd01e4d6e6 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..47d694da9d4a 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);