From mboxrd@z Thu Jan 1 00:00:00 1970 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 D11AAD49791 for ; Mon, 2 Dec 2024 01:13:46 +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=ao8tflQWLTU71VDlUOi8PQg09SXJJ1Vx4hZRzxHp6T0=; b=ZnkjhXxsUe4Wv2jgO198ocHSg5 ZoG+HKAWuOiElrEreR0JAK4oS7xH0K1DiKD928sfFI1ZPgUUqUGVxDYIrG2hWuk5Uy2u7HoaJPJdz 3ud5AzQ1E8UiXitCn6qn19K/Ic/eZYKPxPjQOp2a4VSImlR38kWrfbnagH6LRmIpGL24Yw1N1RtsA oNyZUFDHVQE/3LLfq2qbIIdFCEJMgoFPOWYj7zZ49YucPas6imRoJJnqLonQkpK0UHHdTg/uMMarg 7PRaTSNVVOmJz43jmyJrLKEbojGme4YTmeQy43QlB/BxYYOqx7jHiF3nBy8SF6gypsV0NkYHkUSdS /2JpqIbg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tHv0K-00000004fj6-1VeN; Mon, 02 Dec 2024 01:13:36 +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 1tHuwO-00000004dcK-1ULA; Mon, 02 Dec 2024 01:09:34 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 3D673A40C19; Mon, 2 Dec 2024 01:07:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15699C4CECF; Mon, 2 Dec 2024 01:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733101771; bh=DVqvOO2dJ7B48PDR0q3vBCSu5cpkFSQ2aUVnhv21TuY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dGM9dNbDkh4kjxMlwvZZjcvmXWpivnf2zwumF4df0QwxFTWShfeo1b1l4dM+4cMC0 0O4fJ09RULF4/7nmCnxfh2b/ZGewuvBOcKYIM5WPwmv5/gXQswd1kfZkisK7vbq3rW 7qbZkRhEISePyJuoNrM4aAQp8ldMOUF4B9CBktrLsShhKV9/k+kgzzRmNUJv/cAeTz 7j3jVn9pZEbDxLj1PXTuXJodfecl7S6TkuMuWc4zXFPFXTET+zaWRzMa1xEnOAvrjv mLJOJYbwEio7E3J8J0Aj1rk9I4xquqen8dZa2LAnP6fynOpUK9ooR7gX7coIDkXlKy ziqjQEXHR/6Bw== 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, Ard Biesheuvel Subject: [PATCH v4 04/19] crypto: crc32 - don't unnecessarily register arch algorithms Date: Sun, 1 Dec 2024 17:08:29 -0800 Message-ID: <20241202010844.144356-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241202010844.144356-1-ebiggers@kernel.org> References: <20241202010844.144356-1-ebiggers@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241201_170932_517762_814B3589 X-CRM114-Status: GOOD ( 12.91 ) 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.) Reviewed-by: Ard Biesheuvel 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); -- 2.47.1