Provide a way for a caller external to numa to ensure memblocks in the
memblock reserved list do not cross node boundaries and have a node id
assigned to them. This will be used by PKRAM to ensure initialization of
page structs for preserved pages can be deferred and multithreaded
efficiently.
Signed-off-by: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
---
arch/x86/include/asm/numa.h | 4 ++++
arch/x86/mm/numa.c | 32 ++++++++++++++++++++------------
2 files changed, 24 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index bbfde3d2662f..f9e05f4eb1c6 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -40,6 +40,7 @@ static inline void set_apicid_to_node(int apicid, s16 node)
}
extern int numa_cpu_node(int cpu);
+extern void __init numa_isolate_memblocks(void);
#else /* CONFIG_NUMA */
static inline void set_apicid_to_node(int apicid, s16 node)
@@ -50,6 +51,9 @@ static inline int numa_cpu_node(int cpu)
{
return NUMA_NO_NODE;
}
+static inline void numa_isolate_memblocks(void)
+{
+}
#endif /* CONFIG_NUMA */
#ifdef CONFIG_X86_32
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 59ba008504dc..df0065e24ea5 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -475,6 +475,25 @@ static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
return true;
}
+void __init numa_isolate_memblocks(void)
+{
+ int i;
+
+ /*
+ * Iterate over all memory known to the x86 architecture,
+ * and use those ranges to set the nid in memblock.reserved.
+ * This will split up the memblock regions along node
+ * boundaries and will set the node IDs as well.
+ */
+ for (i = 0; i < numa_meminfo.nr_blks; i++) {
+ struct numa_memblk *mb = numa_meminfo.blk + i;
+ int ret;
+
+ ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
+ WARN_ON_ONCE(ret);
+ }
+}
+
/*
* Mark all currently memblock-reserved physical memory (which covers the
* kernel's own memory ranges) as hot-unswappable.
@@ -493,19 +512,8 @@ static void __init numa_clear_kernel_node_hotplug(void)
* used by the kernel, but those regions are not split up
* along node boundaries yet, and don't necessarily have their
* node ID set yet either.
- *
- * So iterate over all memory known to the x86 architecture,
- * and use those ranges to set the nid in memblock.reserved.
- * This will split up the memblock regions along node
- * boundaries and will set the node IDs as well.
*/
- for (i = 0; i < numa_meminfo.nr_blks; i++) {
- struct numa_memblk *mb = numa_meminfo.blk + i;
- int ret;
-
- ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
- WARN_ON_ONCE(ret);
- }
+ numa_isolate_memblocks();
/*
* Now go over all reserved memblock regions, to construct a
--
2.13.3
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