This is a note to let you know that I've just added the patch titled
tracing: Add trace_array_puts() to write into instance
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-add-trace_array_puts-to-write-into-instance.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f998def3863a2b8f2faa23d0496b2b12d5a1fe8a
Author: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Date: Tue Feb 7 12:28:52 2023 -0500
tracing: Add trace_array_puts() to write into instance
[ Upstream commit d503b8f7474fe7ac616518f7fc49773cbab49f36 ]
Add a generic trace_array_puts() that can be used to "trace_puts()" into
an allocated trace_array instance. This is just another variant of
trace_array_printk().
Link: https://lkml.kernel.org/r/20230207173026.584717290@xxxxxxxxxxx
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Ross Zwisler <zwisler@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Stable-dep-of: 9d52727f8043 ("tracing: Have tracing_snapshot_instance_cond() write errors to the appropriate instance")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/trace.h b/include/linux/trace.h
index 80ffda8717491..2a70a447184c9 100644
--- a/include/linux/trace.h
+++ b/include/linux/trace.h
@@ -33,6 +33,18 @@ struct trace_array;
int register_ftrace_export(struct trace_export *export);
int unregister_ftrace_export(struct trace_export *export);
+/**
+ * trace_array_puts - write a constant string into the trace buffer.
+ * @tr: The trace array to write to
+ * @str: The constant string to write
+ */
+#define trace_array_puts(tr, str) \
+ ({ \
+ str ? __trace_array_puts(tr, _THIS_IP_, str, strlen(str)) : -1; \
+ })
+int __trace_array_puts(struct trace_array *tr, unsigned long ip,
+ const char *str, int size);
+
void trace_printk_init_buffers(void);
__printf(3, 4)
int trace_array_printk(struct trace_array *tr, unsigned long ip,
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index dc097bd23dc3e..3d7bd251302fb 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -990,13 +990,8 @@ __buffer_unlock_commit(struct trace_buffer *buffer, struct ring_buffer_event *ev
ring_buffer_unlock_commit(buffer, event);
}
-/**
- * __trace_puts - write a constant string into the trace buffer.
- * @ip: The address of the caller
- * @str: The constant string to write
- * @size: The size of the string.
- */
-int __trace_puts(unsigned long ip, const char *str, int size)
+int __trace_array_puts(struct trace_array *tr, unsigned long ip,
+ const char *str, int size)
{
struct ring_buffer_event *event;
struct trace_buffer *buffer;
@@ -1004,7 +999,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
unsigned int trace_ctx;
int alloc;
- if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
+ if (!(tr->trace_flags & TRACE_ITER_PRINTK))
return 0;
if (unlikely(tracing_selftest_running || tracing_disabled))
@@ -1013,7 +1008,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
alloc = sizeof(*entry) + size + 2; /* possible \n added */
trace_ctx = tracing_gen_ctx();
- buffer = global_trace.array_buffer.buffer;
+ buffer = tr->array_buffer.buffer;
ring_buffer_nest_start(buffer);
event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc,
trace_ctx);
@@ -1035,11 +1030,23 @@ int __trace_puts(unsigned long ip, const char *str, int size)
entry->buf[size] = '\0';
__buffer_unlock_commit(buffer, event);
- ftrace_trace_stack(&global_trace, buffer, trace_ctx, 4, NULL);
+ ftrace_trace_stack(tr, buffer, trace_ctx, 4, NULL);
out:
ring_buffer_nest_end(buffer);
return size;
}
+EXPORT_SYMBOL_GPL(__trace_array_puts);
+
+/**
+ * __trace_puts - write a constant string into the trace buffer.
+ * @ip: The address of the caller
+ * @str: The constant string to write
+ * @size: The size of the string.
+ */
+int __trace_puts(unsigned long ip, const char *str, int size)
+{
+ return __trace_array_puts(&global_trace, ip, str, size);
+}
EXPORT_SYMBOL_GPL(__trace_puts);
/**
