When using the Radix MMU our PGD is always 64K, and must be naturally
aligned.
For a 4K page size kernel that means page alignment of swapper_pg_dir is
not sufficient, leading to failure to boot.
Use the existing MAX_PTRS_PER_PGD which has the correct value, and
avoids us hard-coding 64K here.
Fixes: e72421a085a8 ("powerpc: Define swapper_pg_dir[] in C")
Reported-by: Daniel Axtens <d...@axtens.net>
Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
---
arch/powerpc/mm/pgtable.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 1707ab580ee2..cd16b407f47e 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -28,7 +28,13 @@
#include <asm/hugetlb.h>
#include <asm/pte-walk.h>
-pgd_t swapper_pg_dir[MAX_PTRS_PER_PGD] __page_aligned_bss;
+#ifdef CONFIG_PPC64
+#define PGD_ALIGN (sizeof(pgd_t) * MAX_PTRS_PER_PGD)
+#else
+#define PGD_ALIGN PAGE_SIZE
+#endif
+
+pgd_t swapper_pg_dir[MAX_PTRS_PER_PGD] __section(".bss..page_aligned")
__aligned(PGD_ALIGN);
static inline int is_exec_fault(void)
{
--
2.25.1
