From patchwork Mon Mar 6 16:06:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vernon Yang X-Patchwork-Id: 660991 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 EFEA3C61DA4 for ; Mon, 6 Mar 2023 16:20:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229817AbjCFQUg (ORCPT ); Mon, 6 Mar 2023 11:20:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231636AbjCFQT5 (ORCPT ); Mon, 6 Mar 2023 11:19:57 -0500 Received: from mail-qt1-x834.google.com (mail-qt1-x834.google.com [IPv6:2607:f8b0:4864:20::834]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92DBF3928F; Mon, 6 Mar 2023 08:17:42 -0800 (PST) Received: by mail-qt1-x834.google.com with SMTP id c3so11092033qtc.8; Mon, 06 Mar 2023 08:17:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1678119375; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=IYGyvuAOKnVSJLZ+PGJAH4uPpRYGFdgKO1BedlDVykI=; b=kgi1+iWFbxRLTFxekjD2pI2NKmQgD+RR4bdx2BeL+4I/+FSqc5MHFSucYLuIohUpfa 0345mB2OordJ4yoq9g5ZqU5h5S6HXkLlCJTBmm5KS1MY2jgy5zaC4Kw7q9JK3dAqjt5Y Y9mnpyZ/39xns9YJxuiTnFz5lCiwRFa6gkdGYyKIx21hcLaLytX3yhaFob4UvWdnLyvV HQRc5NdeHtka0/Fw7mDs+/regvI+w/sWpWbOitUTXj18CkacGgUUL8guO/5WYpDVvzFh n0FDNV5EAN51UuNBhea3wLhq3oYrnQHiHevrMTRk9GXoS6JFBtlu21u3GXFxYov7OinU sdtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678119375; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=IYGyvuAOKnVSJLZ+PGJAH4uPpRYGFdgKO1BedlDVykI=; b=R1HTbg/r7jGD/VOvLvnmokJ41mWdEitSgVv2m97OPoB8Yt2mbG3QwTjAkNYeUnasvh O0NNY5WUkJ6PavXP4ngGiOMYFGmA6zfVuhh0oZhSsCnJraOha0l2WwaDJjY3hLotR84S g9AsPyD2yoEXoW4pnUJLpPVY3PAIpfjWGoBkCYtPmSICg9RCuYDgv9EyO0z3MmxbLMPP /OihA2MdmOu+bBAHe/uK6pt0p/DVBd2EG/Rw9Q/PpfQ29ss9VqdNsJ+eaUulf8WRNhhE ia2/j1AiGKCAt+pFSxEwKLhPYzwFQu2W3lUsUW+TsWOWuieeAsE8gw2P7/vGgzF15YVS yU/A== X-Gm-Message-State: AO0yUKVYuxUueYcKfZaWp3YUD1W+kA5Du7vzEh6KhJWU7keow2lvrBKK s9CFwDO5yPTz0C7zLpxEMsOFUGLwdHo6V6dC X-Google-Smtp-Source: AK7set9FRJJ4bXIzCpqYTe8FRO5hxEPWPyG4KeJpbdnQ94eOSJ9cEuAei2kEStRQ6ROkgIXiyTXqbg== X-Received: by 2002:a62:7b45:0:b0:5a9:b4eb:d262 with SMTP id w66-20020a627b45000000b005a9b4ebd262mr10996934pfc.1.1678118827070; Mon, 06 Mar 2023 08:07:07 -0800 (PST) Received: from vernon-pc.. ([49.67.2.142]) by smtp.gmail.com with ESMTPSA id u6-20020aa78386000000b005d35695a66csm6465318pfm.137.2023.03.06.08.07.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Mar 2023 08:07:06 -0800 (PST) From: Vernon Yang To: torvalds@linux-foundation.org, tytso@mit.edu, Jason@zx2c4.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jejb@linux.ibm.com, martin.petersen@oracle.com, yury.norov@gmail.com, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk, james.smart@broadcom.com, dick.kennedy@broadcom.com Cc: linux-kernel@vger.kernel.org, wireguard@lists.zx2c4.com, netdev@vger.kernel.org, linux-scsi@vger.kernel.org, Vernon Yang Subject: [PATCH 1/5] random: fix try_to_generate_entropy() if no further cpus set Date: Tue, 7 Mar 2023 00:06:47 +0800 Message-Id: <20230306160651.2016767-2-vernon2gm@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230306160651.2016767-1-vernon2gm@gmail.com> References: <20230306160651.2016767-1-vernon2gm@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org After commit 596ff4a09b89 ("cpumask: re-introduce constant-sized cpumask optimizations"), when NR_CPUS <= BITS_PER_LONG, small_cpumask_bits used a macro instead of variable-sized for efficient. If no further cpus set, the cpumask_next() returns small_cpumask_bits, it must greater than or equal to nr_cpumask_bits, so fix it to correctly. Signed-off-by: Vernon Yang --- drivers/char/random.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/random.c b/drivers/char/random.c index ce3ccd172cc8..d76f12a5f74f 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1311,7 +1311,7 @@ static void __cold try_to_generate_entropy(void) /* Basic CPU round-robin, which avoids the current CPU. */ do { cpu = cpumask_next(cpu, &timer_cpus); - if (cpu == nr_cpumask_bits) + if (cpu >= nr_cpumask_bits) cpu = cpumask_first(&timer_cpus); } while (cpu == smp_processor_id() && num_cpus > 1);