ARM: add support to dump the kernel page tables

This patch allows the kernel page tables to be dumped via a debugfs file,
allowing kernel developers to check the layout of the kernel page tables
and the verify the various permissions and type settings.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
index 86a659a19526..dfff709fda3c 100644
--- a/arch/arm/include/asm/pgtable-2level.h
+++ b/arch/arm/include/asm/pgtable-2level.h
@@ -160,6 +160,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
         return (pmd_t *)pud;
 }
 
+#define pmd_large(pmd)          (pmd_val(pmd) & 2)
 #define pmd_bad(pmd)            (pmd_val(pmd) & 2)
 
 #define copy_pmd(pmdpd,pmdps)           \
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 4f9503908dca..03243f7eeddf 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -142,6 +142,7 @@
                                                  PMD_TYPE_TABLE)
 #define pmd_sect(pmd)           ((pmd_val(pmd) & PMD_TYPE_MASK) == \
                                                  PMD_TYPE_SECT)
+#define pmd_large(pmd)          pmd_sect(pmd)
 
 #define pud_clear(pudp)                 \
         do {                            \