[PATCH] powerpc/64e: Fix wrong test in __ptep_test_and_clear_young()

[Christophe Leroy]

Commit 45201c879469 ("powerpc/nohash: Remove hash related code from
nohash headers.") replaced:

  if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
        return 0;

By:

  if (pte_young(*ptep))
        return 0;

But it should be:

  if (!pte_young(*ptep))
        return 0;

Fix it.

Fixes: 45201c879469 ("powerpc/nohash: Remove hash related code from nohash 
headers.")
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/include/asm/nohash/64/pgtable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h 
b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 4ff6aa66b29a..6114a17ed234 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -154,7 +154,7 @@ static inline int __ptep_test_and_clear_young(struct 
mm_struct *mm,
 {
        unsigned long old;
 
-       if (pte_young(*ptep))
+       if (!pte_young(*ptep))
                return 0;
        old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
        return (old & _PAGE_ACCESSED) != 0;
-- 
2.41.0