From patchwork Mon Dec 2 01:08:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13889674 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 9ABC12B9A2; Mon, 2 Dec 2024 01:09:31 +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=1733101771; cv=none; b=qsYH5NTpvDoj0sEmAxNKF3vZ4HqzNb+5aNELfdRV//zLSExqga7HwjDkg938xZ5niGLcckublJ65/gqBhaCozn444D+efX0bUp8F62CkpHfdklOOkyQTg9uVUAc1yIqBRnXixmwqvYgAC8sbIZjWX9M71uwpMZdm598QGYnQSrs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733101771; c=relaxed/simple; bh=DVqvOO2dJ7B48PDR0q3vBCSu5cpkFSQ2aUVnhv21TuY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jykKcNxYSqwNmTvFLU+6r4t525jhnsIXFa1qAK5ZXK4VIOn+JUk5lOvH5/NaDjbQHkUqQey1jDMGZeJSPpLr2IOyKIOBY30GV7poHL0MWA1Oj5sFrlBBjz4DLF7lh9wXKoB7PY5vigvK+ciagCsdLtC7lINFpGhhUrU7iSgK3xw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dGM9dNbD; 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="dGM9dNbD" 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> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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);