Re: [PATCH 1/2] memcg: flatten task_struct->memcg_oom

[Peter Zijlstra <peterz@infradead.org>]

On Wed, Nov 25, 2015 at 06:31:41PM +0300, Andrey Ryabinin wrote:
> > +       /* scheduler bits, serialized by scheduler locks */
> >         unsigned sched_reset_on_fork:1;
> >         unsigned sched_contributes_to_load:1;
> >         unsigned sched_migrated:1;
> > +       unsigned __padding_sched:29;
> 
> AFAIK the order of bit fields is implementation defined, so GCC could
> sort all these bits as it wants.

We're relying on it doing DTRT in other places, so I'm fairly confident
this'll work, otoh

> You could use unnamed zero-widht bit-field to force padding:
> 
>          unsigned :0; //force aligment to the next boundary.

That's a nice trick I was not aware of, thanks!

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