Hi, On Thu, Aug 22, 2019 at 09:52:07AM +0200, Rasmus Villemoes wrote: > init_mm is sizeof(long) larger than it needs to be. Use the > CPU_BITS_NONE macro meant for this, which will initialize just the > indices 0...(BITS_TO_LONGS(NR_CPUS)-1) and hence make the array size > actually BITS_TO_LONGS(NR_CPUS).
I've sent a similar patch [1] a week or so ago, it's in -mm tree. [1] https://lore.kernel.org/linux-mm/1565703815-8584-1-git-send-email-r...@linux.ibm.com/ > Signed-off-by: Rasmus Villemoes <li...@rasmusvillemoes.dk> > --- > mm/init-mm.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/init-mm.c b/mm/init-mm.c > index a787a319211e..fb1e15028ef0 100644 > --- a/mm/init-mm.c > +++ b/mm/init-mm.c > @@ -35,6 +35,6 @@ struct mm_struct init_mm = { > .arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock), > .mmlist = LIST_HEAD_INIT(init_mm.mmlist), > .user_ns = &init_user_ns, > - .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0}, > + .cpu_bitmap = CPU_BITS_NONE, > INIT_MM_CONTEXT(init_mm) > }; > -- > 2.20.1 > > -- Sincerely yours, Mike.
