linux-kernel - Re: [PATCH 3/5] mm/selftests: kvm, mdwe fixes to avoid requiring "make headers"

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Message-ID: <507937be-603c-4382-ac23-dc6c5ee01841@nvidia.com>
Date: Fri, 7 Jun 2024 19:15:48 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Andrew Morton <akpm@...ux-foundation.org>, Jeff Xu <jeffxu@...omium.org>,
	Shuah Khan <shuah@...nel.org>
CC: Andrei Vagin <avagin@...gle.com>, Axel Rasmussen
	<axelrasmussen@...gle.com>, Christian Brauner <brauner@...nel.org>, "David
 Hildenbrand" <david@...hat.com>, Kees Cook <kees@...nel.org>, Kent Overstreet
	<kent.overstreet@...ux.dev>, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>, Peter Xu
	<peterx@...hat.com>, Rich Felker <dalias@...c.org>, <linux-mm@...ck.org>,
	<linux-kselftest@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] mm/selftests: kvm, mdwe fixes to avoid requiring
 "make headers"

On 6/7/24 7:10 PM, John Hubbard wrote:
> On Ubuntu 23.04, the kvm and mdwe selftests/mm build fails due to
> missing a few items that are found in prctl.h. Here is an excerpt of the
> build failures:

The subject line is confused: it really should start with "selftests/mm",
not "mm/selftests". :)


thanks,
John Hubbard
NVIDIA

> 
> ksm_tests.c:252:13: error: use of undeclared identifier 'PR_SET_MEMORY_MERGE'
> ...
> mdwe_test.c:26:18: error: use of undeclared identifier 'PR_SET_MDWE'
> mdwe_test.c:38:18: error: use of undeclared identifier 'PR_GET_MDWE'
> 
> Fix these errors by adding the missing items to vm_util.h, and include
> vm_util.h from mdwe_test.c.
> 
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>   tools/testing/selftests/mm/mdwe_test.c |  1 +
>   tools/testing/selftests/mm/vm_util.h   | 15 +++++++++++++++
>   2 files changed, 16 insertions(+)
> 
> diff --git a/tools/testing/selftests/mm/mdwe_test.c b/tools/testing/selftests/mm/mdwe_test.c
> index 200bedcdc32e..cfe0b64d1567 100644
> --- a/tools/testing/selftests/mm/mdwe_test.c
> +++ b/tools/testing/selftests/mm/mdwe_test.c
> @@ -15,6 +15,7 @@
>   #include <unistd.h>
>   
>   #include "../kselftest_harness.h"
> +#include "vm_util.h"
>   
>   #ifndef __aarch64__
>   # define PROT_BTI	0
> diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h
> index 9007c420d52c..99cbb7c0ea9d 100644
> --- a/tools/testing/selftests/mm/vm_util.h
> +++ b/tools/testing/selftests/mm/vm_util.h
> @@ -61,3 +61,18 @@ unsigned long get_free_hugepages(void);
>   
>   #define PAGEMAP_PRESENT(ent)	(((ent) & (1ull << 63)) != 0)
>   #define PAGEMAP_PFN(ent)	((ent) & ((1ull << 55) - 1))
> +
> +#ifndef PR_SET_MEMORY_MERGE
> +#define PR_SET_MEMORY_MERGE		67
> +#endif
> +
> +#ifndef PR_GET_MEMORY_MERGE
> +#define PR_GET_MEMORY_MERGE		68
> +#endif
> +
> +#ifndef PR_SET_MDWE
> +#define PR_SET_MDWE			65
> +#define PR_MDWE_REFUSE_EXEC_GAIN	(1UL << 0)
> +#define PR_MDWE_NO_INHERIT		(1UL << 1)
> +#define PR_GET_MDWE			66
> +#endif