linux-kernel - Re: [PATCH v14 10/10] secretmem: test: add basic selftest for memfd

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Date:   Sat, 12 Dec 2020 15:59:40 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tycho Andersen <tycho@...ho.ws>, Will Deacon <will@...nel.org>,
        linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-riscv@...ts.infradead.org,
        x86@...nel.org
Subject: Re: [PATCH v14 10/10] secretmem: test: add basic selftest for
 memfd_secret(2)

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@...ux.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.