mm: mark fault_around_bytes __read_mostly
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 <eec72676ad9a62f2727dfed6d270d98c0d02adec@linux.intel.com>
Suggested-by: David Rientjes <d8cd2994e15bc61ddb2b113030bda55eebc3a0fe@google.com>
Acked-by: David Rientjes <d8cd2994e15bc61ddb2b113030bda55eebc3a0fe@google.com>
Cc: Dave Hansen <71bcd3d88361b22cd828f9a350d19d8775f56d4e@intel.com>
Cc: Andrey Ryabinin <d7a2c23eccda99639e3fab64d868a1b1895748fa@samsung.com>
Cc: Sasha Levin <e642b69ed2fc111e09ffdc37feb733a52253340d@oracle.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs