Re: [PATCH] mm: Use fallthrough;

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On Mon, 2020-03-09 at 13:15 +0900, Sergey Senozhatsky wrote:
> On (20/03/07 19:54), Joe Perches wrote:
> > On Sun, 2020-03-08 at 12:18 +0900, Sergey Senozhatsky wrote:
> > > On (20/03/06 23:58), Joe Perches wrote:
> > > [..]
> > > > --- a/mm/mempolicy.c
> > > > +++ b/mm/mempolicy.c
> > > > @@ -907,7 +907,6 @@ static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes)
> > > >  
> > > >  	switch (p->mode) {
> > > >  	case MPOL_BIND:
> > > > -		/* Fall through */
> > > >  	case MPOL_INTERLEAVE:
> > 
> > Consecutive case labels do not need an interleaving fallthrough;
> > 
> > ie: ditto
> 
> I see. Shall this be mentioned in the commit message, maybe?

<shrug, maybe>  I've no real opinion about that necessity.

fallthrough commments are relatively rarely used as a
separating element between case labels.

It's by far most common to just have consecutive case labels
without any other content.

It's somewhere between 500:1 to 1000:1 in the kernel.






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