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Diffstat (limited to 'arch/xtensa/include/asm/highmem.h')
-rw-r--r--arch/xtensa/include/asm/highmem.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h
index 01cef6b40829..6e070db1022e 100644
--- a/arch/xtensa/include/asm/highmem.h
+++ b/arch/xtensa/include/asm/highmem.h
@@ -68,6 +68,11 @@ void kunmap_high(struct page *page);
static inline void *kmap(struct page *page)
{
+ /* Check if this memory layout is broken because PKMAP overlaps
+ * page table.
+ */
+ BUILD_BUG_ON(PKMAP_BASE <
+ XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE);
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return page_address(page);