x86-64, NUMA: Don't assume phys node 0 is always online in numa_emulation()

Undetermined entries in emu_nid_to_phys[] are filled with zero
assuming that physical node 0 is always online; however, this might
not be true depending on hardware configuration.  Find a physical node
which is actually online and use it instead.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: David Rientjes <rientjes@google.com>
LKML-Reference: <alpine.DEB.2.00.1103020628210.31626@chino.kir.corp.google.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index 75b31dc0f329..3696be0c2204 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -301,6 +301,7 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
         const u64 max_addr = max_pfn << PAGE_SHIFT;
         u8 *phys_dist = NULL;
         size_t phys_size = numa_dist_cnt * numa_dist_cnt * sizeof(phys_dist[0]);
+        int dfl_phys_nid;
         int i, j, ret;
 
         if (!emu_cmdline)
@@ -357,6 +358,19 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
                                         node_distance(i, j);
         }
 
+        /* determine the default phys nid to use for unmapped nodes */
+        dfl_phys_nid = NUMA_NO_NODE;
+        for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) {
+                if (emu_nid_to_phys[i] != NUMA_NO_NODE) {
+                        dfl_phys_nid = emu_nid_to_phys[i];
+                        break;
+                }
+        }
+        if (dfl_phys_nid == NUMA_NO_NODE) {
+                pr_warning("NUMA: Warning: can't determine default physical node, disabling emulation\n");
+                goto no_emu;
+        }
+
         /* commit */
         *numa_meminfo = ei;
 
@@ -377,7 +391,7 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
         /* make sure all emulated nodes are mapped to a physical node */
         for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++)
                 if (emu_nid_to_phys[i] == NUMA_NO_NODE)
-                        emu_nid_to_phys[i] = 0;
+                        emu_nid_to_phys[i] = dfl_phys_nid;
 
         /*
          * Transform distance table.  numa_set_distance() ignores all