mirror_zfs/config/kernel-show-options.m4
Richard Yao ed3fc80048 Fix NULL pointer dereference on PaX/GRSecurity patched Linux 3.3 and later kernels
Support for PaX/GRSecurity patched kernels was developed against Linux
3.2.  Unfortunately, an autotools check introduced for a Linux 3.3 API
fails on PaX/GRSecurity patched kernels. This causes the module to be
built against the Linux 3.2 ABI, which results in a NULL pointer
dereference at runtime.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu>
Closes #794
Closes #809
2012-07-20 12:31:45 -07:00

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dnl #
dnl # Linux 3.3 API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SHOW_OPTIONS], [
AC_MSG_CHECKING([whether sops->show_options() wants dentry])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
int show_options (struct seq_file * x, struct dentry * y) { return 0; };
static struct super_operations sops __attribute__ ((unused)) = {
.show_options = show_options,
};
],[
],[
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_SHOW_OPTIONS_WITH_DENTRY, 1,
[sops->show_options() with dentry])
],[
AC_MSG_RESULT([no])
])
])