Re: [PATCH v14 10/10] secretmem: test: add basic selftest for memfd_secret(2)

From: Mike Rapoport <rppt@kernel.org>
To: John Hubbard <jhubbard@nvidia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Borislav Petkov <bp@alien8.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Christopher Lameter <cl@linux.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Hildenbrand <david@redhat.com>,
	Elena Reshetova <elena.reshetova@intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	James Bottomley <jejb@linux.ibm.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Matthew Wilcox <willy@infradead.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
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	Thomas Gleixner <tglx@linutronix.de>,
	Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
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Subject: Re: [PATCH v14 10/10] secretmem: test: add basic selftest for memfd_secret(2)
Date: Sat, 12 Dec 2020 15:59:40 +0200	[thread overview]
Message-ID: <20201212135940.GD8946@kernel.org> (raw)
In-Reply-To: <248f928b-1383-48ea-8584-ec10146e60c9@nvidia.com>

Hi John,

On Fri, Dec 11, 2020 at 10:16:23PM -0800, John Hubbard wrote:
> On 12/2/20 10:29 PM, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@linux.ibm.com>
> ...
> > +#include "../kselftest.h"
> > +
> > +#define fail(fmt, ...) ksft_test_result_fail(fmt, ##__VA_ARGS__)
> > +#define pass(fmt, ...) ksft_test_result_pass(fmt, ##__VA_ARGS__)
> > +#define skip(fmt, ...) ksft_test_result_skip(fmt, ##__VA_ARGS__)
> > +
> > +#ifdef __NR_memfd_secret
> > +
> > +#include <linux/secretmem.h>
> 
> Hi Mike,
> 
> Say, when I tried this out from today's linux-next, I had to delete the
> above line. In other words, the following was required in order to build:
> 
> diff --git a/tools/testing/selftests/vm/memfd_secret.c b/tools/testing/selftests/vm/memfd_secret.c
> index 79578dfd13e6..c878c2b841fc 100644
> --- a/tools/testing/selftests/vm/memfd_secret.c
> +++ b/tools/testing/selftests/vm/memfd_secret.c
> @@ -29,8 +29,6 @@
> 
>  #ifdef __NR_memfd_secret
> 
> -#include <linux/secretmem.h>
> -
>  #define PATTERN        0x55
> 
>  static const int prot = PROT_READ | PROT_WRITE;
> 
> 
> ...and that makes sense to me, because:
> 
> a) secretmem.h is not in the uapi, which this selftests/vm build system
>    expects (it runs "make headers_install" for us, which is *not* going
>    to pick up items in the kernel include dirs), and
> 
> b) There is nothing in secretmem.h that this test uses, anyway! Just these:
> 
> bool vma_is_secretmem(struct vm_area_struct *vma);
> bool page_is_secretmem(struct page *page);
> bool secretmem_active(void);
> 
> 
> ...or am I just Doing It Wrong? :)

You are perfectly right, I had a stale header in uapi from the prevoius
versions, the include in the test remained from then.

@Andrew, can you please add the hunk above as a fixup?

> thanks,
> -- 
> John Hubbard
> NVIDIA

-- 
Sincerely yours,
Mike.