[PATCH 06/17] x86/numa: simplify numa_distance allocation

[Mike Rapoport]

From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>

Allocation of numa_distance uses memblock_phys_alloc_range() to limit
allocation to be below the last mapped page.

But NUMA initializaition runs after the direct map is populated and
there is also code in setup_arch() that adjusts memblock limit to
reflect how much memory is already mapped in the direct map.

Simplify the allocation of numa_distance and use plain memblock_alloc().
This makes the code clearer and ensures that when numa_distance is not
allocated it is always NULL.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
---
 arch/x86/mm/numa.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 5e1dde26674b..ab2d4ecef786 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -319,8 +319,7 @@ void __init numa_reset_distance(void)
 {
 	size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
 
-	/* numa_distance could be 1LU marking allocation failure, test cnt */
-	if (numa_distance_cnt)
+	if (numa_distance)
 		memblock_free(numa_distance, size);
 	numa_distance_cnt = 0;
 	numa_distance = NULL;	/* enable table creation */
@@ -331,7 +330,6 @@ static int __init numa_alloc_distance(void)
 	nodemask_t nodes_parsed;
 	size_t size;
 	int i, j, cnt = 0;
-	u64 phys;
 
 	/* size the new table and allocate it */
 	nodes_parsed = numa_nodes_parsed;
@@ -342,16 +340,12 @@ static int __init numa_alloc_distance(void)
 	cnt++;
 	size = cnt * cnt * sizeof(numa_distance[0]);
 
-	phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0,
-					 PFN_PHYS(max_pfn_mapped));
-	if (!phys) {
+	numa_distance = memblock_alloc(size, PAGE_SIZE);
+	if (!numa_distance) {
 		pr_warn("Warning: can't allocate distance table!\n");
-		/* don't retry until explicitly reset */
-		numa_distance = (void *)1LU;
 		return -ENOMEM;
 	}
 
-	numa_distance = __va(phys);
 	numa_distance_cnt = cnt;
 
 	/* fill with the default distances */
-- 
2.43.0