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__string field definition includes the source variable for a value of the string when the TP hits; in 6.10+ kernels, __assign_str() uses that to copy a value from src to the string, with older kernels, __assign_str still accepted src as a second parameter. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Pavel Snajdr <snajpa@snajpa.net> Co-authored-by: Tony Hutter <hutter2@llnl.gov> Closes #16475 Closes #16515
63 lines
2.2 KiB
Plaintext
63 lines
2.2 KiB
Plaintext
dnl #
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dnl # 6.10 kernel, check number of args of __assign_str() for trace:
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dnl
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dnl # 6.10+: one arg
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dnl # 6.9 and older: two args
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dnl #
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dnl # More specifically, this will test to see if __assign_str() takes one
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dnl # arg. If __assign_str() takes two args, or is not defined, then
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dnl # HAVE_1ARG_ASSIGN_STR will not be set.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_1ARG_ASSIGN_STR], [
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AC_MSG_CHECKING([whether __assign_str() has one arg])
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ZFS_LINUX_TRY_COMPILE_HEADER([
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#include <linux/module.h>
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MODULE_LICENSE("$ZFS_META_LICENSE");
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#define CREATE_TRACE_POINTS
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#include "conftest.h"
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],[
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trace_zfs_autoconf_event_one("1");
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trace_zfs_autoconf_event_two("2");
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_1ARG_ASSIGN_STR, 1,
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[__assign_str() has one arg])
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],[
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AC_MSG_RESULT(no)
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],[
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#if !defined(_CONFTEST_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _CONFTEST_H
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM zfs
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#include <linux/tracepoint.h>
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DECLARE_EVENT_CLASS(zfs_autoconf_event_class,
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TP_PROTO(char *string),
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TP_ARGS(string),
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TP_STRUCT__entry(
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__string(str, string)
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),
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TP_fast_assign(
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__assign_str(str);
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),
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TP_printk("str = %s", __get_str(str))
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);
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#define DEFINE_AUTOCONF_EVENT(name) \
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DEFINE_EVENT(zfs_autoconf_event_class, name, \
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TP_PROTO(char * str), \
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TP_ARGS(str))
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DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_one);
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DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_two);
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#endif /* _CONFTEST_H */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH .
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#define TRACE_INCLUDE_FILE conftest
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#include <trace/define_trace.h>
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])
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])
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