linux-kernel - [PATCH 1/2] x86/numa: carve node online semantics out of alloc_node

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Message-Id: <1562300143-11671-1-git-send-email-kernelfans@gmail.com>
Date:   Fri,  5 Jul 2019 12:15:42 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     x86@...nel.org
Cc:     Pingfan Liu <kernelfans@...il.com>, Michal Hocko <mhocko@...e.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Tony Luck <tony.luck@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Stephen Rothwell <sfr@...b.auug.org.au>, Qian Cai <cai@....pw>,
        Barret Rhoden <brho@...gle.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] x86/numa: carve node online semantics out of alloc_node_data()

Node online means either memory online or cpu online. But there is
requirement to instance a pglist_data, which has neither cpu nor memory
online (refer to [2/2]).

So carve out the online semantics, and call node_set_online() where either
memory or cpu is online.

Signed-off-by: Pingfan Liu <kernelfans@...il.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Pavel Tatashin <pavel.tatashin@...rosoft.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Qian Cai <cai@....pw>
Cc: Barret Rhoden <brho@...gle.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/mm/numa.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index e6dad60..b48d507 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -213,8 +213,6 @@ static void __init alloc_node_data(int nid)
 
 	node_data[nid] = nd;
 	memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
-
-	node_set_online(nid);
 }
 
 /**
@@ -589,6 +587,7 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
 			continue;
 
 		alloc_node_data(nid);
+		node_set_online(nid);
 	}
 
 	/* Dump memblock with node info and return. */
@@ -760,8 +759,10 @@ void __init init_cpu_to_node(void)
 		if (node == NUMA_NO_NODE)
 			continue;
 
-		if (!node_online(node))
+		if (!node_online(node)) {
 			init_memory_less_node(node);
+			node_set_online(nid);
+		}
 
 		numa_set_node(cpu, node);
 	}
-- 
2.7.5