config/kernel-inode-lock.m4

   1 dnl #
   2 dnl # 4.7 API change
   3 dnl # i_mutex is changed to i_rwsem. Instead of directly using
   4 dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared()
   5 dnl # We test inode_lock_shared because inode_lock is introduced earlier.
   6 dnl #
   7 AC_DEFUN([SPL_AC_INODE_LOCK], [
   8         AC_MSG_CHECKING([whether inode_lock_shared() exists])
   9         tmp_flags="$EXTRA_KCFLAGS"
  10         EXTRA_KCFLAGS="-Werror"
  11         SPL_LINUX_TRY_COMPILE([
  12                 #include <linux/fs.h>
  13         ],[
  14                 struct inode *inode = NULL;
  15                 inode_lock_shared(inode);
  16         ],[
  17                 AC_MSG_RESULT(yes)
  18                 AC_DEFINE(HAVE_INODE_LOCK_SHARED, 1, [yes])
  19         ],[
  20                 AC_MSG_RESULT(no)
  21         ])
  22         EXTRA_KCFLAGS="$tmp_flags"
  23 ])