Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751969AbdGRKuw (ORCPT ); Tue, 18 Jul 2017 06:50:52 -0400 Received: from terminus.zytor.com ([65.50.211.136]:43419 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751379AbdGRKuu (ORCPT ); Tue, 18 Jul 2017 06:50:50 -0400 Date: Tue, 18 Jul 2017 03:46:18 -0700 From: tip-bot for Wei Yang Message-ID: Cc: torvalds@linux-foundation.org, peterz@infradead.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, richard.weiyang@gmail.com, mingo@kernel.org, hpa@zytor.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, tglx@linutronix.de, peterz@infradead.org, richard.weiyang@gmail.com In-Reply-To: <20170708013059.29708-2-richard.weiyang@gmail.com> References: <20170708013059.29708-2-richard.weiyang@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/debug] x86/numa_emulation: Refine the calculation of max_emu_nid and dfl_phys_nid Git-Commit-ID: 158f424f427e686816bc64cd623e3bfc3390dfb0 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2753 Lines: 79 Commit-ID: 158f424f427e686816bc64cd623e3bfc3390dfb0 Gitweb: http://git.kernel.org/tip/158f424f427e686816bc64cd623e3bfc3390dfb0 Author: Wei Yang AuthorDate: Sat, 8 Jul 2017 09:30:57 +0800 Committer: Ingo Molnar CommitDate: Tue, 18 Jul 2017 11:16:49 +0200 x86/numa_emulation: Refine the calculation of max_emu_nid and dfl_phys_nid max_emu_nid and dfl_phys_nid is calculated from emu_nid_to_phys[], which is calculated in split_nodes_xxx_interleave(). From the logic in these functions, it is assured the emu_nid_to_phys[] has meaningful value if it return successfully and ensures dfl_phys_nid will get a valid value. This patch removes the error branch to check invalid dfl_phys_nid and abstracts out this part to a function for readability. Signed-off-by: Wei Yang Acked-by: Thomas Gleixner Cc: Linus Torvalds Cc: Peter Zijlstra Cc: bp@alien8.de Cc: kirill@shutemov.name Cc: rientjes@google.com Cc: tj@kernel.org Link: http://lkml.kernel.org/r/20170708013059.29708-2-richard.weiyang@gmail.com Signed-off-by: Ingo Molnar --- arch/x86/mm/numa_emulation.c | 30 +++++++++++++++++------------- 1 file changed, 17 insertions(+), 13 deletions(-) diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c index a8f90ce..a6d5530 100644 --- a/arch/x86/mm/numa_emulation.c +++ b/arch/x86/mm/numa_emulation.c @@ -280,6 +280,22 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei, return 0; } +int __init setup_emu2phys_nid(int *dfl_phys_nid) +{ + int i, max_emu_nid = 0; + + *dfl_phys_nid = NUMA_NO_NODE; + for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) { + if (emu_nid_to_phys[i] != NUMA_NO_NODE) { + max_emu_nid = i; + if (*dfl_phys_nid == NUMA_NO_NODE) + *dfl_phys_nid = emu_nid_to_phys[i]; + } + } + + return max_emu_nid; +} + /** * numa_emulation - Emulate NUMA nodes * @numa_meminfo: NUMA configuration to massage @@ -376,19 +392,7 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) * Determine the max emulated nid and the default phys nid to use * for unmapped nodes. */ - max_emu_nid = 0; - dfl_phys_nid = NUMA_NO_NODE; - for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) { - if (emu_nid_to_phys[i] != NUMA_NO_NODE) { - max_emu_nid = i; - if (dfl_phys_nid == NUMA_NO_NODE) - dfl_phys_nid = emu_nid_to_phys[i]; - } - } - if (dfl_phys_nid == NUMA_NO_NODE) { - pr_warning("NUMA: Warning: can't determine default physical node, disabling emulation\n"); - goto no_emu; - } + max_emu_nid = setup_emu2phys_nid(&dfl_phys_nid); /* commit */ *numa_meminfo = ei;