mm: disable fault around on emulated access bit architecture

[cascardo/linux.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index f29e5ab..a1b93d9 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2899,8 +2899,16 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
        update_mmu_cache(vma, address, pte);
 }
 
+/*
+ * If architecture emulates "accessed" or "young" bit without HW support,
+ * there is no much gain with fault_around.
+ */
 static unsigned long fault_around_bytes __read_mostly =
+#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+       PAGE_SIZE;
+#else
        rounddown_pow_of_two(65536);
+#endif
 
 #ifdef CONFIG_DEBUG_FS
 static int fault_around_bytes_get(void *data, u64 *val)