lkml.org 
[lkml]   [2019]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 4/9] powerpc: numa: check the node id consistently for powerpc
Date
According to Section 6.2.14 from ACPI spec 6.3 [1], the setting
of proximity domain is optional, as below:

This optional object is used to describe proximity domain
associations within a machine. _PXM evaluates to an integer
that identifies a device as belonging to a Proximity Domain
defined in the System Resource Affinity Table (SRAT).

This patch checks node id with the below case before returning
node_to_cpumask_map[node]:
1. if node_id >= nr_node_ids, return cpu_none_mask
2. if node_id < 0, return cpu_online_mask
3. if node_to_cpumask_map[node_id] is NULL, return cpu_online_mask

[1] https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
---
arch/powerpc/include/asm/topology.h | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 2f7e1ea..217dc9b 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -17,9 +17,16 @@ struct device_node;

#include <asm/mmzone.h>

-#define cpumask_of_node(node) ((node) == -1 ? \
- cpu_all_mask : \
- node_to_cpumask_map[node])
+static inline const struct cpumask *cpumask_of_node(int node)
+{
+ if (node >= nr_node_ids)
+ return cpu_none_mask;
+
+ if (node < 0 || !node_to_cpumask_map[node])
+ return cpu_online_mask;
+
+ return node_to_cpumask_map[node];
+}

struct pci_bus;
#ifdef CONFIG_PCI
--
2.8.1
\
 
 \ /
  Last update: 2019-08-31 08:01    [W:0.183 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site