linux-kernel - [PATCH 11/12] selftests/mm: fix missing UFFDIO_CONTINUE_MODE

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Date:   Thu, 1 Jun 2023 18:33:57 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     David Hildenbrand <david@...hat.com>, Peter Xu <peterx@...hat.com>,
        "Shuah Khan" <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>, <linux-mm@...ck.org>,
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 11/12] selftests/mm: fix missing UFFDIO_CONTINUE_MODE_WP and similar build failures

UFFDIO_CONTINUE_MODE_WP, UFFD_FEATURE_WP_UNPOPULATED, USERFAULTFD_IOC,
and USERFAULTFD_IOC_NEW are needed lately, but they are not in my host
(Arch Linux) distro's userfaultfd.h yet. So put them in here.

A better approach would be to include the uapi version of userfaultfd.h
from the kernel tree, but that currently fails with rather difficult
linker problems (__packed is defined multiple times, ugg), so defer that
to another day and just fix the build for now.

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 tools/testing/selftests/mm/uffd-common.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h
index a1cdb78c0762..98847e41ecf9 100644
--- a/tools/testing/selftests/mm/uffd-common.h
+++ b/tools/testing/selftests/mm/uffd-common.h
@@ -36,6 +36,23 @@
 
 #define UFFD_FLAGS	(O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY)
 
+#ifndef UFFDIO_CONTINUE_MODE_WP
+#define UFFDIO_CONTINUE_MODE_WP			((__u64)1<<1)
+#endif
+
+#ifndef UFFD_FEATURE_WP_UNPOPULATED
+#define UFFD_FEATURE_WP_UNPOPULATED		(1<<13)
+#endif
+
+/* ioctls for /dev/userfaultfd */
+#ifndef USERFAULTFD_IOC
+#define USERFAULTFD_IOC 0xAA
+#endif
+
+#ifndef USERFAULTFD_IOC_NEW
+#define USERFAULTFD_IOC_NEW _IO(USERFAULTFD_IOC, 0x00)
+#endif
+
 #define _err(fmt, ...)						\
 	do {							\
 		int ret = errno;				\
-- 
2.40.1