diff options
Diffstat (limited to 'config/kernel-bio-empty-barrier.m4')
| -rw-r--r-- | config/kernel-bio-empty-barrier.m4 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/config/kernel-bio-empty-barrier.m4 b/config/kernel-bio-empty-barrier.m4 new file mode 100644 index 000000000..99549fe24 --- /dev/null +++ b/config/kernel-bio-empty-barrier.m4 @@ -0,0 +1,20 @@ +dnl # +dnl # 2.6.24 API change +dnl # Empty write barriers are now supported and we should use them. +dnl # +AC_DEFUN([ZFS_AC_KERNEL_BIO_EMPTY_BARRIER], [ + AC_MSG_CHECKING([whether bio_empty_barrier() is defined]) + EXTRA_KCFLAGS="-Werror" + ZFS_LINUX_TRY_COMPILE([ + #include <linux/bio.h> + ],[ + struct bio bio; + (void)bio_empty_barrier(&bio); + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_BIO_EMPTY_BARRIER, 1, + [bio_empy_barrier() is defined]) + ],[ + AC_MSG_RESULT(no) + ]) +]) |