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Linux 6.10 compat: Fix tracepoints definitions

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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
This commit is contained in:
Pavel Snajdr
2024-09-17 22:38:02 +02:00
committed by GitHub
parent ac04407ffe
commit 90af1e83e8
5 changed files with 82 additions and 19 deletions
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config/kernel-assign_str.m4
+62
View File
@@ -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("$ZFS_META_LICENSE");
#define CREATE_TRACE_POINTS
#include "conftest.h"
],[
trace_zfs_autoconf_event_one("1");
trace_zfs_autoconf_event_two("2");
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_1ARG_ASSIGN_STR, 1,
[__assign_str() has one arg])
],[
AC_MSG_RESULT(no)
],[
#if !defined(_CONFTEST_H) || defined(TRACE_HEADER_MULTI_READ)
#define _CONFTEST_H
#undef TRACE_SYSTEM
#define TRACE_SYSTEM zfs
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(zfs_autoconf_event_class,
TP_PROTO(char *string),
TP_ARGS(string),
TP_STRUCT__entry(
__string(str, string)
),
TP_fast_assign(
__assign_str(str);
),
TP_printk("str = %s", __get_str(str))
);
#define DEFINE_AUTOCONF_EVENT(name) \
DEFINE_EVENT(zfs_autoconf_event_class, name, \
TP_PROTO(char * str), \
TP_ARGS(str))
DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_one);
DEFINE_AUTOCONF_EVENT(zfs_autoconf_event_two);
#endif /* _CONFTEST_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE conftest
#include <trace/define_trace.h>
])
])
config/kernel.m4
+1
View File
@@ -332,6 +332,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_SYNC_BDEV
ZFS_AC_KERNEL_MM_PAGE_SIZE
ZFS_AC_KERNEL_MM_PAGE_MAPPING
ZFS_AC_KERNEL_1ARG_ASSIGN_STR
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE