linux-kernel - Re: [PATCH v3 3/5] bitmap: Add bitmap_alloc(), bitmap_zalloc() and bitmap

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Message-Id: <20180618161056.e52efd0e8bd36211e60705a2@linux-foundation.org>
Date:   Mon, 18 Jun 2018 16:10:56 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        agk@...hat.com, Mike Snitzer <snitzer@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        shli@...nel.org, linux-raid@...r.kernel.org,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        ynorov@...iumnetworks.com, lkml <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v3 3/5] bitmap: Add bitmap_alloc(), bitmap_zalloc() and
 bitmap_free()

On Mon, 18 Jun 2018 15:01:43 -0700 Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:

> > > +unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
> > > +{
> > > +     return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long), flags);
> > > +}
> > > +EXPORT_SYMBOL(bitmap_alloc);
> > > +
> > > +unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags)
> > > +{
> > > +     return bitmap_alloc(nbits, flags | __GFP_ZERO);
> > > +}
> > > +EXPORT_SYMBOL(bitmap_zalloc);
> > > +
> > > +void bitmap_free(const unsigned long *bitmap)
> > > +{
> > > +     kfree(bitmap);
> > > +}
> > > +EXPORT_SYMBOL(bitmap_free);
> > > +
> >
> > I suggest these functions are small and simple enough to justify
> > inlining them.
> >
> 
> We can't as we end up including bitmap.h (by the way of cpumask.h)
> form slab.h, so we gen circular dependency.

That info should have been in the changelog, and probably a code
comment.

> Maybe if we removed memcg
> stuff from slab.h so we do not need to include workqueue.h...

Or move the basic slab API stuff out of slab.h into a new header.  Or
create a new, standalone work_struct.h - that looks pretty simple.