mm: mark fault_around_bytes __read_mostly

fault_around_bytes can only be changed via debugfs.  Let's mark it
read-mostly.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Suggested-by: David Rientjes <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Sasha Levin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/memory.c b/mm/memory.c
index dc47261c46866ba7c13213354f15628493c941a6..5596d77e86561450753452ad0b49357e21ce199e 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2766,7 +2766,8 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
        update_mmu_cache(vma, address, pte);
 }
 
-static unsigned long fault_around_bytes = rounddown_pow_of_two(65536);
+static unsigned long fault_around_bytes __read_mostly =
+       rounddown_pow_of_two(65536);
 
 #ifdef CONFIG_DEBUG_FS
 static int fault_around_bytes_get(void *data, u64 *val)