LINUX: Replace dcache.h for fs.h in config tests

When detecting if we have certain Linux kernel features, we only
include dcache.h. On some kernel versions (at least 2.4.27),
compilation fails if we include dcache.h directly (due to e.g.
list_head not being defined), which causes false negatives in tests
such as the test for dcache_lock. If we instead include fs.h, which
includes dcache.h, the tests succeed when they should succeed. So, use
fs.h instead of dcache.h.

Change-Id: I43fbbc7e5a952d9effbbac16adb9891c36f729bd
Reviewed-on: http://gerrit.openafs.org/3989
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>

diff --git a/acinclude.m4 b/acinclude.m4
index 2fa43b8..d174f56 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -813,7 +813,7 @@ case $AFS_SYSNAME in *_linux* | *_umlinux*)
                                     [struct timespec s;
                                      s = current_kernel_time();])
                 AC_CHECK_LINUX_FUNC([d_alloc_anon],
-                                    [#include <linux/dcache.h>],
+                                    [#include <linux/fs.h>],
                                     [d_alloc_anon(NULL);])
                 AC_CHECK_LINUX_FUNC([do_sync_read],
                                     [#include <linux/fs.h>],

diff --git a/src/cf/linux-test4.m4 b/src/cf/linux-test4.m4
index 670bd5d..9390489 100644 (file)
--- a/src/cf/linux-test4.m4
+++ b/src/cf/linux-test4.m4
@@ -492,7 +492,7 @@ AC_DEFUN([LINUX_EXPORTS_PROC_ROOT_FS], [
 AC_DEFUN([LINUX_D_PATH_TAKES_STRUCT_PATH], [
   AC_CHECK_LINUX_BUILD([if d_path() takes a struct path argument],
                       [ac_cv_linux_d_path_takes_struct_path],
-                      [#include <linux/dcache.h>],
+                      [#include <linux/fs.h>],
                       [struct path *p; d_path(p, NULL, 0);],
                       [D_PATH_TAKES_STRUCT_PATH],
                       [define if d_path() takes a struct path argument],
@@ -575,7 +575,7 @@ AC_DEFUN([LINUX_HAVE_TRY_TO_FREEZE], [
 AC_DEFUN([LINUX_HAVE_DCACHE_LOCK], [
   AC_CHECK_LINUX_BUILD([for dcache_lock],
                        [ac_cv_linux_have_dcache_lock],
-                       [#include <linux/dcache.h> ],
+                       [#include <linux/fs.h> ],
                        [printk("%p", &dcache_lock);],
                        [HAVE_DCACHE_LOCK],
                        [define if dcache_lock exists],
@@ -586,7 +586,7 @@ AC_DEFUN([LINUX_HAVE_DCACHE_LOCK], [
 AC_DEFUN([LINUX_D_COUNT_IS_INT], [
   AC_CHECK_LINUX_BUILD([if dentry->d_count is an int],
                        [ac_cv_linux_d_count_int],
-                       [#include <linux/dcache.h> ],
+                       [#include <linux/fs.h> ],
                        [struct dentry _d;
                        dget(&_d);
                        _d.d_count = 1;],