From ac3e262cba81889c0bb04ce87a50a1709f2726e7 Mon Sep 17 00:00:00 2001
From: Petr Vorel <petr.vorel@gmail.com>
Date: Thu, 1 Oct 2020 23:28:39 +0200
Subject: [PATCH] lapi: Add sysinfo.h to fix build with MUSL libc
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The reason is to avoid indirect <linux/sysinfo.h> include when using
some network headers: <linux/netlink.h> or others -> <linux/kernel.h>
-> <linux/sysinfo.h>

This indirect include causes on MUSL redefinition of struct sysinfo when
included both <sys/sysinfo.h> and some of UAPI headers:

In file included from x86_64-buildroot-linux-musl/sysroot/usr/include/linux/kernel.h:5,
                 from x86_64-buildroot-linux-musl/sysroot/usr/include/linux/netlink.h:5,
                 from ../include/tst_netlink.h:14,
                 from tst_crypto.c:13:
x86_64-buildroot-linux-musl/sysroot/usr/include/linux/sysinfo.h:8:8: error: redefinition of ‘struct sysinfo’
 struct sysinfo {
        ^~~~~~~
In file included from ../include/tst_safe_macros.h:15,
                 from ../include/tst_test.h:93,
                 from tst_crypto.c:11:
x86_64-buildroot-linux-musl/sysroot/usr/include/sys/sysinfo.h:10:8: note: originally defined here

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>

[ upstream status: https://patchwork.ozlabs.org/project/ltp/patch/20201001231256.6930-1-petr.vorel@gmail.com/

But this patch is not going to get upstreamed because it got fixed in Linux kernel:
a85cbe6159ff "uapi: move constants from <linux/kernel.h> to <linux/const.h>"

This patch was also backported to stable and LTS versions,
which we use since buildroot 54584d233b "{linux, linux-headers}: bump
5.{4, 10}.x 4.{4, 9, 14, 19} series".
We just wait for all musl based toolchains to be rebuilt. ]
---
 include/lapi/sysinfo.h                        | 22 +++++++++++++++++++
 include/tst_safe_macros.h                     |  2 +-
 lib/safe_macros.c                             |  2 +-
 lib/tst_memutils.c                            |  2 +-
 testcases/kernel/mem/mtest01/mtest01.c        |  2 +-
 testcases/kernel/syscalls/madvise/madvise06.c |  2 +-
 testcases/kernel/syscalls/sysinfo/sysinfo01.c |  2 +-
 testcases/kernel/syscalls/sysinfo/sysinfo02.c |  2 +-
 testcases/kernel/syscalls/sysinfo/sysinfo03.c |  2 +-
 9 files changed, 30 insertions(+), 8 deletions(-)
 create mode 100644 include/lapi/sysinfo.h

diff --git a/include/lapi/sysinfo.h b/include/lapi/sysinfo.h
new file mode 100644
index 000000000..d0e0e93d7
--- /dev/null
+++ b/include/lapi/sysinfo.h
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2020 Petr Vorel <petr.vorel@gmail.com>
+ */
+
+#ifndef SYSINFO_H__
+
+/*
+ * Don't use <sys/sysinfo.h> as it breaks build MUSL toolchain.
+ * Use <linux/sysinfo.h> instead.
+ *
+ * Some kernel UAPI headers do indirect <linux/sysinfo.h> include:
+ * <linux/netlink.h> or others -> <linux/kernel.h> -> <linux/sysinfo.h>
+ *
+ * This indirect include causes on MUSL redefinition of struct sysinfo when
+ * included both <sys/sysinfo.h> and some of UAPI headers:
+ */
+#include <linux/sysinfo.h>
+
+#define SYSINFO_H__
+
+#endif /* SYSINFO_H__ */
diff --git a/include/tst_safe_macros.h b/include/tst_safe_macros.h
index ee3df4142..3cb1623f9 100644
--- a/include/tst_safe_macros.h
+++ b/include/tst_safe_macros.h
@@ -12,7 +12,7 @@
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/vfs.h>
-#include <sys/sysinfo.h>
+#include <linux/sysinfo.h>
 #include <fcntl.h>
 #include <libgen.h>
 #include <signal.h>
diff --git a/lib/safe_macros.c b/lib/safe_macros.c
index a5b6bc504..20d01d304 100644
--- a/lib/safe_macros.c
+++ b/lib/safe_macros.c
@@ -11,7 +11,6 @@
 #include <sys/wait.h>
 #include <sys/mount.h>
 #include <sys/xattr.h>
-#include <sys/sysinfo.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <libgen.h>
@@ -23,6 +22,7 @@
 #include <malloc.h>
 #include "test.h"
 #include "safe_macros.h"
+#include "lapi/sysinfo.h"
 
 char *safe_basename(const char *file, const int lineno,
 		    void (*cleanup_fn) (void), char *path)
diff --git a/lib/tst_memutils.c b/lib/tst_memutils.c
index dd09db490..085392365 100644
--- a/lib/tst_memutils.c
+++ b/lib/tst_memutils.c
@@ -5,11 +5,11 @@
 
 #include <unistd.h>
 #include <limits.h>
-#include <sys/sysinfo.h>
 #include <stdlib.h>
 
 #define TST_NO_DEFAULT_MAIN
 #include "tst_test.h"
+#include "lapi/sysinfo.h"
 
 #define BLOCKSIZE (16 * 1024 * 1024)
 
diff --git a/testcases/kernel/mem/mtest01/mtest01.c b/testcases/kernel/mem/mtest01/mtest01.c
index 9676ea4b5..33b2ac822 100644
--- a/testcases/kernel/mem/mtest01/mtest01.c
+++ b/testcases/kernel/mem/mtest01/mtest01.c
@@ -20,7 +20,6 @@
  */
 
 #include <sys/types.h>
-#include <sys/sysinfo.h>
 #include <sys/wait.h>
 #include <limits.h>
 #include <signal.h>
@@ -29,6 +28,7 @@
 #include <unistd.h>
 
 #include "lapi/abisize.h"
+#include "lapi/sysinfo.h"
 #include "tst_test.h"
 
 #define FIVE_HUNDRED_MB         (500ULL*1024*1024)
diff --git a/testcases/kernel/syscalls/madvise/madvise06.c b/testcases/kernel/syscalls/madvise/madvise06.c
index 962554163..aa4d3bc91 100644
--- a/testcases/kernel/syscalls/madvise/madvise06.c
+++ b/testcases/kernel/syscalls/madvise/madvise06.c
@@ -41,7 +41,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <sys/mount.h>
-#include <sys/sysinfo.h>
+#include "lapi/sysinfo.h"
 #include "tst_test.h"
 
 #define CHUNK_SZ (400*1024*1024L)
diff --git a/testcases/kernel/syscalls/sysinfo/sysinfo01.c b/testcases/kernel/syscalls/sysinfo/sysinfo01.c
index 2ea44a2be..a95066bf5 100644
--- a/testcases/kernel/syscalls/sysinfo/sysinfo01.c
+++ b/testcases/kernel/syscalls/sysinfo/sysinfo01.c
@@ -69,9 +69,9 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/signal.h>
-#include <sys/sysinfo.h>
 
 #include "test.h"
+#include "lapi/sysinfo.h"
 
 void setup();
 void cleanup();
diff --git a/testcases/kernel/syscalls/sysinfo/sysinfo02.c b/testcases/kernel/syscalls/sysinfo/sysinfo02.c
index 678b8f1d3..5ce65d20e 100644
--- a/testcases/kernel/syscalls/sysinfo/sysinfo02.c
+++ b/testcases/kernel/syscalls/sysinfo/sysinfo02.c
@@ -65,10 +65,10 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/signal.h>
-#include <sys/sysinfo.h>
 #include <stdint.h>
 
 #include "test.h"
+#include "lapi/sysinfo.h"
 
 #define INVALID_ADDRESS ((uintptr_t)-1)
 
diff --git a/testcases/kernel/syscalls/sysinfo/sysinfo03.c b/testcases/kernel/syscalls/sysinfo/sysinfo03.c
index af7cb6421..3b61a05b1 100644
--- a/testcases/kernel/syscalls/sysinfo/sysinfo03.c
+++ b/testcases/kernel/syscalls/sysinfo/sysinfo03.c
@@ -13,9 +13,9 @@
 
  */
 
-#include <sys/sysinfo.h>
 #include "lapi/namespaces_constants.h"
 #include "lapi/posix_clocks.h"
+#include "lapi/sysinfo.h"
 #include "tst_test.h"
 
 static int offsets[] = {
-- 
2.30.0