LU-18127 autoconf: fix configure tests -Warray-bounds errors

Kernel commit v5.17-rc3-1-ge6148767825c (Makefile:
Enable -Warray-bounds) enabled -Warray-bounds option,
which caused Lustre configure tests hit false failures
as follows:

  build/conftest.c: In function 'main':
  build/conftest.c:228:39: error: array subscript 0 is
    outside array bounds of 'struct inode_operations[0]'
    [-Werror=array-bounds]
    228 | ((struct inode_operations *)1)->get_acl((struct inode *)NULL, 0, false);
        |                                       ^~
  cc1: all warnings being treated as errors

This patch fixes the "struct inode_operations" related
configure tests to avoid the above failures.

The -Warray-bounds option was disabled by the following
kernel commits:
- v5.19-rc1-28-gf0be87c42cbd (gcc-12: disable '-Warray-bounds' universally for now)
- v6.2-rc3-9-g5a41237ad1d4 (gcc: disable -Warray-bounds for gcc-11 too)
- v6.3-rc7-202-g0da6e5fd6c37 (gcc: disable '-Warray-bounds' for gcc-13 too)

Test-Parameters: mdtcount=4 mdscount=2 \
  clientdistro=ubuntu2204 testlist=sanity
Test-Parameters: mdtcount=4 mdscount=2 \
  env=SANITY_EXCEPT="27J 103a 244a" \
  clientdistro=sles15sp6 testlist=sanity
Test-Parameters: optional mdtcount=4 mdscount=2 \
  clientdistro=ubuntu2404 testlist=sanity

Change-Id: Iee73962ffc117a2f98e8f339462820aff2278815
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55989
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Qian Yingjin <qian@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index d1ca415..49ba06b 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -923,10 +923,11 @@ AC_DEFUN([LC_SRC_IOPS_RENAME_WITH_FLAGS], [
        LB2_LINUX_TEST_SRC([iops_rename_with_flags], [
                #include <linux/fs.h>
        ],[
+               struct inode_operations *iops = NULL;
                struct inode *i1 = NULL, *i2 = NULL;
                struct dentry *d1 = NULL, *d2 = NULL;
-               int rc;
-               rc = ((struct inode_operations *)0)->rename(i1, d1, i2, d2, 0);
+
+               iops->rename(i1, d1, i2, d2, 0);
        ])
 ]) # LC_IOPS_RENAME_WITH_FLAGS
 AC_DEFUN([LC_IOPS_RENAME_WITH_FLAGS], [
@@ -1391,10 +1392,11 @@ AC_DEFUN([LC_SRC_SYMLINK_OPS_USE_NAMEIDATA], [
                #include <linux/namei.h>
                #include <linux/fs.h>
        ],[
+               struct inode_operations *iops = NULL;
                struct nameidata *nd = NULL;
 
-               ((struct inode_operations *)0)->follow_link(NULL, nd);
-               ((struct inode_operations *)0)->put_link(NULL, nd, NULL);
+               iops->follow_link(NULL, nd);
+               iops->put_link(NULL, nd, NULL);
        ])
 ])
 AC_DEFUN([LC_SYMLINK_OPS_USE_NAMEIDATA], [
@@ -2262,9 +2264,10 @@ AC_DEFUN([LC_SRC_INODEOPS_ENHANCED_GETATTR], [
        LB2_LINUX_TEST_SRC([getattr_path], [
                #include <linux/fs.h>
        ],[
+               struct inode_operations *iops = NULL;
                struct path path;
 
-               ((struct inode_operations *)1)->getattr(&path, NULL, 0, 0);
+               iops->getattr(&path, NULL, 0, 0);
        ])
 ])
 AC_DEFUN([LC_INODEOPS_ENHANCED_GETATTR], [
@@ -3323,7 +3326,9 @@ AC_DEFUN([LC_SRC_HAVE_GET_ACL_RCU_ARG], [
        LB2_LINUX_TEST_SRC([get_acl_rcu_argument], [
                #include <linux/fs.h>
        ],[
-               ((struct inode_operations *)1)->get_acl((struct inode *)NULL, 0, false);
+               struct inode_operations *iops = NULL;
+
+               iops->get_acl((struct inode *)NULL, 0, false);
        ],[-Werror])
 ])
 AC_DEFUN([LC_HAVE_GET_ACL_RCU_ARG], [
@@ -4095,9 +4100,10 @@ AC_DEFUN([LC_SRC_HAVE_ACL_WITH_DENTRY], [
        LB2_LINUX_TEST_SRC([acl_with_dentry], [
                #include <linux/fs.h>
        ],[
+               struct inode_operations *iops = NULL;
                struct dentry *dentry = NULL;
 
-               ((struct inode_operations *)1)->get_acl(NULL, dentry, 0);
+               iops->get_acl(NULL, dentry, 0);
                (void)dentry;
        ],[-Werror])
 ])
@@ -4145,8 +4151,9 @@ AC_DEFUN([LC_SRC_HAVE_MNT_IDMAP_ARG], [
                #include <linux/mount.h>
                #include <linux/fs.h>
        ],[
-               ((struct inode_operations *)1)->getattr((struct mnt_idmap *)NULL,
-                                                       NULL, NULL, 0, 0);
+               struct inode_operations *iops = NULL;
+
+               iops->getattr((struct mnt_idmap *)NULL, NULL, NULL, 0, 0);
        ],[-Werror])
 ])
 AC_DEFUN([LC_HAVE_MNT_IDMAP_ARG], [