powerpc/mm: Fix crash in page table dump with huge pages

The page table dump code doesn't know about huge pages, so currently
it crashes (or walks random memory, usually leading to a crash), if it
finds a huge page. On Book3S we only see huge pages in the Linux page
tables when we're using the P9 Radix MMU.

Teaching the code to properly handle huge pages is a bit more involved,
so for now just prevent the crash.

Cc: stable@vger.kernel.org # v4.10+
Fixes: 8eb07b187000 ("powerpc/mm: Dump linux pagetables")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/dump_linuxpagetables.c b/arch/powerpc/mm/dump_linuxpagetables.c
index d659345a98d66c03a2cab1ceed3526af95551cc6..44fe4833910f64bcd014a2e3843ecd8c3077fc26 100644 (file)
--- a/arch/powerpc/mm/dump_linuxpagetables.c
+++ b/arch/powerpc/mm/dump_linuxpagetables.c
@@ -16,6 +16,7 @@
  */
 #include <linux/debugfs.h>
 #include <linux/fs.h>
+#include <linux/hugetlb.h>
 #include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
@@ -391,7 +392,7 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
 
        for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
                addr = start + i * PMD_SIZE;
-               if (!pmd_none(*pmd))
+               if (!pmd_none(*pmd) && !pmd_huge(*pmd))
                        /* pmd exists */
                        walk_pte(st, pmd, addr);
                else
@@ -407,7 +408,7 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
 
        for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
                addr = start + i * PUD_SIZE;
-               if (!pud_none(*pud))
+               if (!pud_none(*pud) && !pud_huge(*pud))
                        /* pud exists */
                        walk_pmd(st, pud, addr);
                else
@@ -427,7 +428,7 @@ static void walk_pagetables(struct pg_state *st)
         */
        for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
                addr = KERN_VIRT_START + i * PGDIR_SIZE;
-               if (!pgd_none(*pgd))
+               if (!pgd_none(*pgd) && !pgd_huge(*pgd))
                        /* pgd exists */
                        walk_pud(st, pgd, addr);
                else