linux-2626-support-20080608

[openafs.git] / src / cf / linux-test4.m4

diff --git a/src/cf/linux-test4.m4 b/src/cf/linux-test4.m4
index 995c5da..65df334 100644 (file)
--- a/src/cf/linux-test4.m4
+++ b/src/cf/linux-test4.m4
@@ -81,10 +81,9 @@ AC_DEFUN([LINUX_EXPORTS_INIT_MM], [
   AC_MSG_CHECKING([for exported init_mm])
   AC_CACHE_VAL([ac_cv_linux_exports_init_mm], [
     AC_TRY_KBUILD(
-[#include <linux/modversions.h>],
-[#ifndef __ver_init_mm
-#error init_mm not exported
-#endif],
+[extern struct mm_struct init_mm;],
+[void *address = &init_mm;
+printk("%p\n", address);],
       ac_cv_linux_exports_init_mm=yes,
       ac_cv_linux_exports_init_mm=no)])
   AC_MSG_RESULT($ac_cv_linux_exports_init_mm)])
@@ -512,6 +511,18 @@ AC_DEFUN([LINUX_KERNEL_PAGE_FOLLOW_LINK], [
     CPPFLAGS="$save_CPPFLAGS"])
   AC_MSG_RESULT($ac_cv_linux_kernel_page_follow_link)])
 
+AC_DEFUN([LINUX_KERNEL_HLIST_UNHASHED], [
+  AC_MSG_CHECKING([for hlist_unhashed])
+  AC_CACHE_VAL([ac_cv_linux_kernel_hlist_unhashed], [
+    save_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS -Werror-implicit-function-declaration"
+    AC_TRY_KBUILD(
+[#include <linux/list.h>],
+[hlist_unhashed(0);],
+      ac_cv_linux_kernel_hlist_unhashed=yes,
+      ac_cv_linux_kernel_hlist_unhashed=no)
+    CPPFLAGS="$save_CPPFLAGS"])
+  AC_MSG_RESULT($ac_cv_linux_kernel_hlist_unhashed)])
 
 AC_DEFUN([LINUX_FS_STRUCT_ADDRESS_SPACE_HAS_GFP_MASK], [
   AC_MSG_CHECKING([for gfp_mask in struct address_space])
@@ -1000,3 +1011,43 @@ printk("%x\n", _nd.path);],
       ac_cv_linux_struct_nameidata_has_path=no)])
   AC_MSG_RESULT($ac_cv_linux_struct_nameidata_has_path)])
 
+AC_DEFUN([LINUX_EXPORTS_RCU_READ_LOCK], [
+  AC_MSG_CHECKING([if rcu_read_lock is usable])
+  AC_CACHE_VAL([ac_cv_linux_exports_rcu_read_lock], [
+    AC_TRY_KBUILD(
+[#include <linux/rcupdate.h>],
+[rcu_read_lock();],
+      ac_cv_linux_exports_rcu_read_lock=yes,
+      ac_cv_linux_exports_rcu_read_lock=no)])
+  AC_MSG_RESULT($ac_cv_linux_exports_rcu_read_lock)
+  if test "x$ac_cv_linux_exports_rcu_read_lock" = "xyes"; then
+    AC_DEFINE([EXPORTED_RCU_READ_LOCK], 1, [define if rcu_read_lock() is usable])
+  fi])
+ 
+AC_DEFUN([LINUX_EXPORTS_FIND_TASK_BY_PID], [
+  AC_MSG_CHECKING([if find_task_by_pid is usable])
+  AC_CACHE_VAL([ac_cv_linux_exports_find_task_by_pid], [
+    AC_TRY_KBUILD(
+[#include <linux/sched.h>],
+[pid_t p;
+find_task_by_pid(p);],
+      ac_cv_linux_exports_find_task_by_pid=yes,
+      ac_cv_linux_exports_find_task_by_pid=no)])
+  AC_MSG_RESULT($ac_cv_linux_exports_find_task_by_pid)
+  if test "x$ac_cv_linux_exports_find_task_by_pid" = "xyes"; then
+    AC_DEFINE([EXPORTED_FIND_TASK_BY_PID], 1, [define if find_task_by_pid() is usable])
+  fi])
+ 
+AC_DEFUN([LINUX_EXPORTS_PROC_ROOT_FS], [
+  AC_MSG_CHECKING([if proc_root_fs is defined and exported])
+  AC_CACHE_VAL([ac_cv_linux_exports_proc_root_fs], [
+    AC_TRY_KBUILD(
+[#include <linux/proc_fs.h>],
+[struct proc_dir_entry *p = proc_root_fs;],
+      ac_cv_linux_exports_proc_root_fs=yes,
+      ac_cv_linux_exports_proc_root_fs=no)])
+  AC_MSG_RESULT($ac_cv_linux_exports_proc_root_fs)
+  if test "x$ac_cv_linux_exports_proc_root_fs" = "xyes"; then
+    AC_DEFINE([EXPORTED_PROC_ROOT_FS], 1, [define if proc_root_fs is exported])
+  fi])
+