[PATCH v5 21/36] proc/kcore: include private-node RAM in the kcore RAM map

[Gregory Price]

The kcore_ram_list bounds its scan at the highest pfn in N_MEMORY.

As a result, private nodes placed above the last N_MEMORY node, which is
the common case for device/CXL memory - is truncated out of /proc/kcore.

Include N_MEMORY_PRIVATE nodes in the scan boundary.  /proc/kcore is
root-only (CAP_SYS_RAWIO), so this exposes nothing new - it just lets
a debugger read private-node memory like any other RAM.

Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>
---
 fs/proc/kcore.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 390547b992acd..f67194dc2a9b8 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -251,11 +251,14 @@ static int kcore_ram_list(struct list_head *list)
 {
 	int nid, ret;
 	unsigned long end_pfn;
+	nodemask_t mem;
 
 	/* Not initialized....update now */
 	/* find out "max pfn" */
 	end_pfn = 0;
-	for_each_node_state(nid, N_MEMORY) {
+	/* Include private node memory in the scan */
+	nodes_or(mem, node_states[N_MEMORY], node_states[N_MEMORY_PRIVATE]);
+	for_each_node_mask(nid, mem) {
 		unsigned long node_end;
 		node_end = node_end_pfn(nid);
 		if (end_pfn < node_end)
-- 
2.53.0-Meta