linux-kernel - [tip:x86/debug] x86/numa_emulation: Assign physnode_mask directly from numa_nodes

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Date:   Tue, 18 Jul 2017 03:46:39 -0700
From:   tip-bot for Wei Yang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     bp@...e.de, tglx@...utronix.de, peterz@...radead.org,
        rientjes@...gle.com, hpa@...or.com, richard.weiyang@...il.com,
        mingo@...nel.org, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [tip:x86/debug] x86/numa_emulation: Assign physnode_mask directly
 from numa_nodes_parsed

Commit-ID:  d80a9eb3c78d7d0c823a8224cd6e3b37ebdfd8cd
Gitweb:     http://git.kernel.org/tip/d80a9eb3c78d7d0c823a8224cd6e3b37ebdfd8cd
Author:     Wei Yang <richard.weiyang@...il.com>
AuthorDate: Sat, 8 Jul 2017 09:30:58 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 18 Jul 2017 11:16:49 +0200

x86/numa_emulation: Assign physnode_mask directly from numa_nodes_parsed

numa_init() has already called init_func(), which is responsible for
setting numa_nodes_parsed, so use this nodemask instead of re-finding it
when calling numa_emulation().

This patch gets the physnode_mask directly from numa_nodes_parsed. At
the same time, it corrects the comment of these two functions.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
Reviewed-by: Borislav Petkov <bp@...e.de>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: David Rientjes <rientjes@...gle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: bp@...en8.de
Cc: kirill@...temov.name
Cc: tj@...nel.org
Link: http://lkml.kernel.org/r/20170708013059.29708-3-richard.weiyang@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/numa_emulation.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index a6d5530..80904ed 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -75,13 +75,15 @@ static int __init emu_setup_memblk(struct numa_meminfo *ei,
 
 /*
  * Sets up nr_nodes fake nodes interleaved over physical nodes ranging from addr
- * to max_addr.  The return value is the number of nodes allocated.
+ * to max_addr.
+ *
+ * Returns zero on success or negative on error.
  */
 static int __init split_nodes_interleave(struct numa_meminfo *ei,
 					 struct numa_meminfo *pi,
 					 u64 addr, u64 max_addr, int nr_nodes)
 {
-	nodemask_t physnode_mask = NODE_MASK_NONE;
+	nodemask_t physnode_mask = numa_nodes_parsed;
 	u64 size;
 	int big;
 	int nid = 0;
@@ -116,9 +118,6 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
 		return -1;
 	}
 
-	for (i = 0; i < pi->nr_blks; i++)
-		node_set(pi->blk[i].nid, physnode_mask);
-
 	/*
 	 * Continue to fill physical nodes with fake nodes until there is no
 	 * memory left on any of them.
@@ -200,13 +199,15 @@ static u64 __init find_end_of_node(u64 start, u64 max_addr, u64 size)
 
 /*
  * Sets up fake nodes of `size' interleaved over physical nodes ranging from
- * `addr' to `max_addr'.  The return value is the number of nodes allocated.
+ * `addr' to `max_addr'.
+ *
+ * Returns zero on success or negative on error.
  */
 static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
 					      struct numa_meminfo *pi,
 					      u64 addr, u64 max_addr, u64 size)
 {
-	nodemask_t physnode_mask = NODE_MASK_NONE;
+	nodemask_t physnode_mask = numa_nodes_parsed;
 	u64 min_size;
 	int nid = 0;
 	int i, ret;
@@ -231,9 +232,6 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
 	}
 	size &= FAKE_NODE_MIN_HASH_MASK;
 
-	for (i = 0; i < pi->nr_blks; i++)
-		node_set(pi->blk[i].nid, physnode_mask);
-
 	/*
 	 * Fill physical nodes with fake nodes of size until there is no memory
 	 * left on any of them.