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-rw-r--r--mm/cma.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/mm/cma.c b/mm/cma.c
index fde706e1284f..8e9ec13d31db 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -215,9 +215,21 @@ int __init cma_declare_contiguous(phys_addr_t base,
bool fixed, struct cma **res_cma)
{
phys_addr_t memblock_end = memblock_end_of_DRAM();
- phys_addr_t highmem_start = __pa(high_memory);
+ phys_addr_t highmem_start;
int ret = 0;
+#ifdef CONFIG_X86
+ /*
+ * high_memory isn't direct mapped memory so retrieving its physical
+ * address isn't appropriate. But it would be useful to check the
+ * physical address of the highmem boundary so it's justfiable to get
+ * the physical address from it. On x86 there is a validation check for
+ * this case, so the following workaround is needed to avoid it.
+ */
+ highmem_start = __pa_nodebug(high_memory);
+#else
+ highmem_start = __pa(high_memory);
+#endif
pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n",
__func__, &size, &base, &limit, &alignment);