Re: [PATCH 01/17] mm: don't include <linux/blk-cgroup.h> in <linux/writeback.h>

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On Wed, Sep 15, 2021 at 08:45:56AM +0000, Johannes Thumshirn wrote:
> > index 5259edacde380..066a9118c3748 100644
> > --- a/drivers/gpu/drm/i915/i915_utils.h
> > +++ b/drivers/gpu/drm/i915/i915_utils.h
> > @@ -30,6 +30,7 @@
> >  #include <linux/sched.h>
> >  #include <linux/types.h>
> >  #include <linux/workqueue.h>
> > +#include <linux/sched/clock.h>
> >  
> >  struct drm_i915_private;
> >  struct timer_list;
> 
> This one
> 
> > diff --git a/lib/random32.c b/lib/random32.c
> > index 4d0e05e471d72..a57a0e18819d0 100644
> > --- a/lib/random32.c
> > +++ b/lib/random32.c
> > @@ -39,6 +39,7 @@
> >  #include <linux/random.h>
> >  #include <linux/sched.h>
> >  #include <linux/bitops.h>
> > +#include <linux/slab.h>
> >  #include <asm/unaligned.h>
> >  #include <trace/events/random.h>
> >  
> > 
> 
> and this one look unrelated.

.. but they aren't.  All these headers indirectl pulled these headers
in before and now don't.

random32.c pulls in writeback.h through trace/events/random.h, which
pulls in blk-cgroup.h, which pull in blkdev.h, which pulls in slab.h
through some other weird twist of fate.

The drm code also somehow manages to pull in writeback.h




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