X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=mm%2Fcma.c;h=8e9ec13d31db2cce25384a4dc1a296e2a6fd2ca8;hb=6b101e2a3ce4d2a0312087598bd1ab4a1db2ac40;hp=fde706e1284fbc05edd04722fd8f0abf92d406bf;hpb=d82012695ef29e4e1c8153ccf43098ec8e50369e;p=cascardo%2Flinux.git

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);