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-rw-r--r--arch/powerpc/mm/mem.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9c25feb..b1c5734 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -307,6 +307,12 @@ static void __init register_page_bootmem_info(void)
void __init mem_init(void)
{
+ /*
+ * book3s is limited to 16 page sizes due to encoding this in
+ * a 4-bit field for slices.
+ */
+ BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
+
#ifdef CONFIG_SWIOTLB
swiotlb_init(0);
#endif

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