fs/exec.c: replace opencoded set_mask_bits()

Link: http://lkml.kernel.org/r/1548275584-18096-2-git-send-email-vgupta@synopsys.com
Link: http://lkml.kernel.org/g/20150807115710.GA16897@redhat.com
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/exec.c b/fs/exec.c
index 74f3672146a7e208b75488f0a8861a6ee0c05b5d..bf0ace3841ad6efc27ab37b88a32d5a367aad159 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1944,15 +1944,10 @@ EXPORT_SYMBOL(set_binfmt);
  */
 void set_dumpable(struct mm_struct *mm, int value)
 {
-       unsigned long old, new;
-
        if (WARN_ON((unsigned)value > SUID_DUMP_ROOT))
                return;
 
-       do {
-               old = READ_ONCE(mm->flags);
-               new = (old & ~MMF_DUMPABLE_MASK) | value;
-       } while (cmpxchg(&mm->flags, old, new) != old);
+       set_mask_bits(&mm->flags, MMF_DUMPABLE_MASK, value);
 }
 
 SYSCALL_DEFINE3(execve,