spl-mutex: fix race in mutex_exit

[mirror_spl.git] / config / spl-build.m4

diff --git a/config/spl-build.m4 b/config/spl-build.m4
index 698d51a87f276c45650607cee5d3750503bd0004..630d67c2d5daad0fa5c09e6ea82c82e026874f90 100644 (file)
--- a/config/spl-build.m4
+++ b/config/spl-build.m4
@@ -53,6 +53,8 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
        SPL_AC_INODE_LOCK
        SPL_AC_GROUP_INFO_GID
        SPL_AC_KMEM_CACHE_CREATE_USERCOPY
+       SPL_AC_WAIT_QUEUE_ENTRY_T
+       SPL_AC_WAIT_QUEUE_HEAD_ENTRY
 ])
 
 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
@@ -1670,3 +1672,56 @@ AC_DEFUN([SPL_AC_KMEM_CACHE_CREATE_USERCOPY], [
        ])
        EXTRA_KCFLAGS="$tmp_flags"
 ])
+
+dnl #
+dnl # 4.13 API change
+dnl # Renamed struct wait_queue -> struct wait_queue_entry.
+dnl #
+AC_DEFUN([SPL_AC_WAIT_QUEUE_ENTRY_T], [
+       AC_MSG_CHECKING([whether wait_queue_entry_t exists])
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/wait.h>
+       ],[
+               wait_queue_entry_t *entry __attribute__ ((unused));
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY_T, 1,
+                   [wait_queue_entry_t exists])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])
+
+dnl #
+dnl # 4.13 API change
+dnl # Renamed wait_queue_head::task_list -> wait_queue_head::head
+dnl # Renamed wait_queue_entry::task_list -> wait_queue_entry::entry
+dnl #
+AC_DEFUN([SPL_AC_WAIT_QUEUE_HEAD_ENTRY], [
+       AC_MSG_CHECKING([whether wq_head->head and wq_entry->entry exist])
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/wait.h>
+
+               #ifdef HAVE_WAIT_QUEUE_ENTRY_T
+               typedef wait_queue_head_t       spl_wait_queue_head_t;
+               typedef wait_queue_entry_t      spl_wait_queue_entry_t;
+               #else
+               typedef wait_queue_head_t       spl_wait_queue_head_t;
+               typedef wait_queue_t            spl_wait_queue_entry_t;
+               #endif
+       ],[
+               spl_wait_queue_head_t wq_head;
+               spl_wait_queue_entry_t wq_entry;
+               struct list_head *head __attribute__ ((unused));
+               struct list_head *entry __attribute__ ((unused));
+
+               head = &wq_head.head;
+               entry = &wq_entry.entry;
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_WAIT_QUEUE_HEAD_ENTRY, 1,
+                   [wq_head->head and wq_entry->entry exist])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])