From patchwork Wed Sep 28 16:50:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 610273 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C71F0C32771 for ; Wed, 28 Sep 2022 16:50:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234240AbiI1Que (ORCPT ); Wed, 28 Sep 2022 12:50:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41174 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234278AbiI1Quc (ORCPT ); Wed, 28 Sep 2022 12:50:32 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC2FD7754A; Wed, 28 Sep 2022 09:50:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 887B061F2D; Wed, 28 Sep 2022 16:50:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9AE28C433D6; Wed, 28 Sep 2022 16:50:26 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="BtbkVSOz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1664383824; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=MPljTNW527gCkehfhx8+XdIZwq9wSOk7roP1gIrDLuo=; b=BtbkVSOzwf0mLL7A4X2f+vXElefHugzoYFA0h0lt2b6NqsFsPkYD5Vju2wkvDmmW8X8jSC GxUeZzLv2cKZ4dngbOw6SPyH4Z2gW+DFa7/DUWw3yVK7NuRGF6KOeyDEq/x/G23+grpgxc 32Icf+qZ/9i78XsM+sRklrylcE9Q0Qs= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id ef8b7b80 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Wed, 28 Sep 2022 16:50:24 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH] random: add 8-bit and 16-bit batches Date: Wed, 28 Sep 2022 18:50:18 +0200 Message-Id: <20220928165018.73496-1-Jason@zx2c4.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org There are numerous places in the kernel that would be sped up by having smaller batches. Currently those callsites do `get_random_u32() & 0xff` or similar. Since these are pretty spread out, and will require patches to multiple different trees, let's get ahead of the curve and lay the foundation for `get_random_u8()` and `get_random_u16()`, so that it's then possible to start submitting conversion patches leisurely. Signed-off-by: Jason A. Donenfeld --- drivers/char/random.c | 2 ++ include/linux/random.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/char/random.c b/drivers/char/random.c index f2aa3ab1b458..64ee16ffb8b7 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -506,6 +506,8 @@ EXPORT_SYMBOL(get_random_ ##type); DEFINE_BATCHED_ENTROPY(u64) DEFINE_BATCHED_ENTROPY(u32) +DEFINE_BATCHED_ENTROPY(u16) +DEFINE_BATCHED_ENTROPY(u8) #ifdef CONFIG_SMP /* diff --git a/include/linux/random.h b/include/linux/random.h index a9e6e16f9774..2c130f8f18e5 100644 --- a/include/linux/random.h +++ b/include/linux/random.h @@ -38,6 +38,8 @@ static inline int unregister_random_vmfork_notifier(struct notifier_block *nb) { #endif void get_random_bytes(void *buf, size_t len); +u8 get_random_u8(void); +u16 get_random_u16(void); u32 get_random_u32(void); u64 get_random_u64(void); static inline unsigned int get_random_int(void)