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memblock: fix fragility in checks for unset node ID

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Use numa_valid_node() function to verify that nid is a valid node ID
 instead of inconsistent comparisons with either NUMA_NO_NODE or
 MAX_NUMNODES.
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Merge tag 'fixes-2024-06-23' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

Pull memblock fix from Mike Rapoport:
 "Fix fragility in checks for unset node ID.

  Use numa_valid_node() function to verify that nid is a valid node
  ID instead of inconsistent comparisons with either NUMA_NO_NODE or
  MAX_NUMNODES"

* tag 'fixes-2024-06-23' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  memblock: use numa_valid_node() helper to check for invalid node ID
This commit is contained in:
Linus Torvalds 2024-06-23 10:32:24 -04:00
commit 0971e82ea3
2 changed files with 12 additions and 21 deletions
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5
include/linux/numa.h
View File

@ -15,6 +15,11 @@
#define NUMA_NO_NODE (-1)
#define NUMA_NO_MEMBLK (-1)
static inline bool numa_valid_node(int nid)
{
return nid >= 0 && nid < MAX_NUMNODES;
}
/* optionally keep NUMA memory info available post init */
#ifdef CONFIG_NUMA_KEEP_MEMINFO
#define __initdata_or_meminfo

28
mm/memblock.c
View File

@ -754,7 +754,7 @@ bool __init_memblock memblock_validate_numa_coverage(unsigned long threshold_byt
/* calculate lose page */
for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
if (nid == NUMA_NO_NODE)
if (!numa_valid_node(nid))
nr_pages += end_pfn - start_pfn;
}
@ -1061,7 +1061,7 @@ static bool should_skip_region(struct memblock_type *type,
return false;
/* only memory regions are associated with nodes, check it */
if (nid != NUMA_NO_NODE && nid != m_nid)
if (numa_valid_node(nid) && nid != m_nid)
return true;
/* skip hotpluggable memory regions if needed */
@ -1118,10 +1118,6 @@ void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
int idx_a = *idx & 0xffffffff;
int idx_b = *idx >> 32;
if (WARN_ONCE(nid == MAX_NUMNODES,
"Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
for (; idx_a < type_a->cnt; idx_a++) {
struct memblock_region *m = &type_a->regions[idx_a];
@ -1215,9 +1211,6 @@ void __init_memblock __next_mem_range_rev(u64 *idx, int nid,
int idx_a = *idx & 0xffffffff;
int idx_b = *idx >> 32;
if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
if (*idx == (u64)ULLONG_MAX) {
idx_a = type_a->cnt - 1;
if (type_b != NULL)
@ -1303,7 +1296,7 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
continue;
if (nid == MAX_NUMNODES || nid == r_nid)
if (!numa_valid_node(nid) || nid == r_nid)
break;
}
if (*idx >= type->cnt) {
@ -1339,10 +1332,6 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
int start_rgn, end_rgn;
int i, ret;
if (WARN_ONCE(nid == MAX_NUMNODES,
"Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
if (ret)
return ret;
@ -1452,9 +1441,6 @@ phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
enum memblock_flags flags = choose_memblock_flags();
phys_addr_t found;
if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
if (!align) {
/* Can't use WARNs this early in boot on powerpc */
dump_stack();
@ -1467,7 +1453,7 @@ phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
if (found && !memblock_reserve(found, size))
goto done;
if (nid != NUMA_NO_NODE && !exact_nid) {
if (numa_valid_node(nid) && !exact_nid) {
found = memblock_find_in_range_node(size, align, start,
end, NUMA_NO_NODE,
flags);
@ -1987,7 +1973,7 @@ static void __init_memblock memblock_dump(struct memblock_type *type)
end = base + size - 1;
flags = rgn->flags;
#ifdef CONFIG_NUMA
if (memblock_get_region_node(rgn) != MAX_NUMNODES)
if (numa_valid_node(memblock_get_region_node(rgn)))
snprintf(nid_buf, sizeof(nid_buf), " on node %d",
memblock_get_region_node(rgn));
#endif
@ -2181,7 +2167,7 @@ static void __init memmap_init_reserved_pages(void)
start = region->base;
end = start + region->size;
if (nid == NUMA_NO_NODE || nid >= MAX_NUMNODES)
if (!numa_valid_node(nid))
nid = early_pfn_to_nid(PFN_DOWN(start));
reserve_bootmem_region(start, end, nid);
@ -2272,7 +2258,7 @@ static int memblock_debug_show(struct seq_file *m, void *private)
seq_printf(m, "%4d: ", i);
seq_printf(m, "%pa..%pa ", &reg->base, &end);
if (nid != MAX_NUMNODES)
if (numa_valid_node(nid))
seq_printf(m, "%4d ", nid);
else
seq_printf(m, "%4c ", 'x');