microblaze: define __PAGETABLE_PMD_FOLDED

Microblaze uses custom implementation of PMD folding, but doesn't define
__PAGETABLE_PMD_FOLDED, which generic code expects to see. Let's fix it.

Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc(). It
also fixes problems with recently-introduced pmd accounting.

Signed-off-by: Kirill A. Shutemov <[e-mail]>
Reported-by: Guenter Roeck <[e-mail]>
Tested-by: Guenter Roeck <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/microblaze/include/asm/pgtable.h

···
 
 #include <asm-generic/4level-fixup.h>
 
+#define __PAGETABLE_PMD_FOLDED
+
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__