linux-kernel - Re: [RFC PATCH 7/7] tools: add skeleton code for userland testing of VMA logic

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Message-ID: <qtmnn7ed3tekdysowuniavokstwclxayvnjyhdeglns4lldvzy@bgf7loiqcl3d>
Date: Thu, 27 Jun 2024 15:42:23 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Lorenzo Stoakes <lstoakes@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Vlastimil Babka <vbabka@...e.cz>, Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
        Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [RFC PATCH 7/7] tools: add skeleton code for userland testing of
 VMA logic

* Lorenzo Stoakes <lstoakes@...il.com> [240627 15:25]:
> On Thu, Jun 27, 2024 at 01:20:30PM -0400, Liam R. Howlett wrote:
> [snip]
> > > +
> > > +clean:
> > > +	$(RM) $(TARGETS) *.o radix-tree.c idr.c generated/map-shift.h generated/bit-length.h
> >
> > This needs to clean out vma.c to avoid stale testing.
> >
> > But, none of this is needed.
> >
> > What we can do instead is add the correct header guards to the
> > mm/vma_internal.h file, change the tools/testing/vma/vma_internal.h
> > header guards to be the same (ie: remove TESTING_ from the existing
> > ones), then we can include vma_internal.h into vma_stub.c prior to
> > including "../../../mm/vma.c", and we don't need to copy the file.
> >
> > Essentially use the #ifdef guards to replace the header by ordering the
> > local header for inclusion prior to the c file.
> 
> Ack this is a good idea, will do in v2.
> 
> >
> >
> > > diff --git a/tools/testing/vma/errors.txt b/tools/testing/vma/errors.txt
> > > new file mode 100644
> > > index 000000000000..e69de29bb2d1
> > > diff --git a/tools/testing/vma/generated/autoconf.h b/tools/testing/vma/generated/autoconf.h
> > > new file mode 100644
> > > index 000000000000..92dc474c349b
> > > --- /dev/null
> > > +++ b/tools/testing/vma/generated/autoconf.h
> > > @@ -0,0 +1,2 @@
> > > +#include "bit-length.h"
> > > +#define CONFIG_XARRAY_MULTI 1
> > > diff --git a/tools/testing/vma/linux/atomic.h b/tools/testing/vma/linux/atomic.h
> > > new file mode 100644
> > > index 000000000000..298b0fb7aab2
> > > --- /dev/null
> > > +++ b/tools/testing/vma/linux/atomic.h
> >
> > This should have header guards as well.
> 
> Yup, the reason I kept it like this is because existing linux/*.h headers
> in shared/linux didn't have header guards and I wanted to keep things in
> line with that... will change.
> 
> >
> > > @@ -0,0 +1,19 @@
> > > +#ifndef atomic_t
> > > +#define atomic_t int32_t
> > > +#endif
> > > +
> > > +#ifndef atomic_inc
> > > +#define atomic_inc(x) uatomic_inc(x)
> > > +#endif
> > > +
> > > +#ifndef atomic_read
> > > +#define atomic_read(x) uatomic_read(x)
> > > +#endif
> > > +
> > > +#ifndef atomic_set
> > > +#define atomic_set(x, y) do {} while (0)
> > > +#endif
> > > +
> > > +#ifndef U8_MAX
> > > +#define U8_MAX UCHAR_MAX
> > > +#endif
> > > diff --git a/tools/testing/vma/linux/mmzone.h b/tools/testing/vma/linux/mmzone.h
> > > new file mode 100644
> > > index 000000000000..71546e15bdd3
> > > --- /dev/null
> > > +++ b/tools/testing/vma/linux/mmzone.h
> > > @@ -0,0 +1,37 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > +#ifndef _TOOLS_MMZONE_H
> > > +#define _TOOLS_MMZONE_H
> >
> > It might be best to use the same guards here to avoid mmzone.h from
> > getting pulled in.
> 
> You mean the actual [root]/include/linux/mmzone.h ? Just deploying the same
> header guard trick as mentioned above re: vma_internal.h?
> 

Yes, just use the same header guard trick.

...

Thanks,
Liam