WIP: config/kernel-assign_str.m4

config/kernel-assign_str.m4

@@ -0,0 +1,62 @@
+dnl #
+dnl # 6.10 kernel, check number of args of __assign_str() for trace:
+dnl
+dnl # 6.10+:           one arg
+dnl # 6.9 and older:   two args
+dnl #
+dnl # More specifically, this will test to see if __assign_str() takes one
+dnl # arg.  If __assign_str() takes two args, or is not defined, then
+dnl # HAVE_1ARG_ASSIGN_STR will not be set.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_1ARG_ASSIGN_STR], [
+       AC_MSG_CHECKING([whether __assign_str() has one arg])
+       ZFS_LINUX_TRY_COMPILE_HEADER([
+               #include <linux/module.h>
+               MODULE_LICENSE("$ZFS_META_LICENSE");
+
+               #define CREATE_TRACE_POINTS
+               #include "conftest.h"
+       ],[
+               trace_zfs_autoconf_event_one("1");
+               trace_zfs_autoconf_event_two("2");
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_1ARG_ASSIGN_STR, 1,
+                   [__assign_str() has one arg])
+       ],[
+               AC_MSG_RESULT(no)
+       ],[
+               #if !defined(_CONFTEST_H) || defined(TRACE_HEADER_MULTI_READ)
+               #define _CONFTEST_H
+
+               #undef  TRACE_SYSTEM
+               #define TRACE_SYSTEM zfs
+               #include <linux/tracepoint.h>
+
+               DECLARE_EVENT_CLASS(zfs_autoconf_event_class,
+                       TP_PROTO(char *string),
+                       TP_ARGS(string),
+                       TP_STRUCT__entry(
+                               __string(str, string)
+                       ),
+                       TP_fast_assign(
+                               __assign_str(str);
+                       ),
+                       TP_printk("str = %s", __get_str(str))
+               );
+
+               #define DEFINE_AUTOCONF_EVENT(name) \
+               DEFINE_EVENT(zfs_autoconf_event_class, name, \
+                       TP_PROTO(char * str), \
+                       TP_ARGS(str))
+               DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_one);
+               DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_two);
+
+               #endif /* _CONFTEST_H */
+
+               #undef  TRACE_INCLUDE_PATH
+               #define TRACE_INCLUDE_PATH .
+               #define TRACE_INCLUDE_FILE conftest
+               #include <trace/define_trace.h>
+       ])
+])