diff options
Diffstat (limited to 'config/spl-build.m4')
| -rw-r--r-- | config/spl-build.m4 | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index b2a50bf16..630d67c2d 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -49,6 +49,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [ SPL_AC_USLEEP_RANGE SPL_AC_KMEM_CACHE_ALLOCFLAGS SPL_AC_WAIT_ON_BIT + SPL_AC_MUTEX_OWNER SPL_AC_INODE_LOCK SPL_AC_GROUP_INFO_GID SPL_AC_KMEM_CACHE_CREATE_USERCOPY @@ -1562,6 +1563,35 @@ AC_DEFUN([SPL_AC_WAIT_ON_BIT], [ ]) dnl # +dnl # Check whether mutex has owner with task_struct type. +dnl # +dnl # Note that before Linux 3.0, mutex owner is of type thread_info. +dnl # +dnl # Note that in Linux 3.18, the condition for owner is changed from +dnl # defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP) to +dnl # defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER) +dnl # +AC_DEFUN([SPL_AC_MUTEX_OWNER], [ + AC_MSG_CHECKING([whether mutex has owner]) + tmp_flags="$EXTRA_KCFLAGS" + EXTRA_KCFLAGS="-Werror" + SPL_LINUX_TRY_COMPILE([ + #include <linux/mutex.h> + #include <linux/spinlock.h> + ],[ + DEFINE_MUTEX(m); + struct task_struct *t __attribute__ ((unused)); + t = m.owner; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_MUTEX_OWNER, 1, [yes]) + ],[ + AC_MSG_RESULT(no) + ]) + EXTRA_KCFLAGS="$tmp_flags" +]) + +dnl # dnl # 4.7 API change dnl # i_mutex is changed to i_rwsem. Instead of directly using dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared() |