This is used in the tracing system and needed by wireless now, it was
introduced in commit 6ea22486ba46bc ("tracing: Add array printing
helper").
This code is copied from kernel 4.0.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/ftrace_event.h | 10 ++++++
backport/backport-include/trace/ftrace.h | 9 +++++
backport/compat/backport-4.0.c | 46 ++++++++++++++++++++++++++
3 files changed, 65 insertions(+)
create mode 100644 backport/backport-include/linux/ftrace_event.h
create mode 100644 backport/backport-include/trace/ftrace.h
diff --git a/backport/backport-include/linux/ftrace_event.h b/backport/backport-include/linux/ftrace_event.h
new file mode 100644
index 00000000..edea21ee
--- /dev/null
+++ b/backport/backport-include/linux/ftrace_event.h
@@ -0,0 +1,10 @@
+#ifndef __BACKPORT_LINUX_FTRACE_EVENT_H
+#define __BACKPORT_LINUX_FTRACE_EVENT_H
+#include_next <linux/ftrace_event.h>
+
+#if LINUX_VERSION_IS_LESS(4,0,0)
+const char *ftrace_print_array_seq(struct trace_seq *p,
+ const void *buf, int buf_len,
+ size_t el_size);
+#endif
+#endif /* __BACKPORT_LINUX_FTRACE_EVENT_H */
diff --git a/backport/backport-include/trace/ftrace.h b/backport/backport-include/trace/ftrace.h
new file mode 100644
index 00000000..5fda0ce5
--- /dev/null
+++ b/backport/backport-include/trace/ftrace.h
@@ -0,0 +1,9 @@
+#undef __print_array
+#define __print_array(array, count, el_size) \
+ ({ \
+ BUILD_BUG_ON(el_size != 1 && el_size != 2 && \
+ el_size != 4 && el_size != 8); \
+ ftrace_print_array_seq(p, array, count, el_size); \
+ })
+
+#include_next <trace/ftrace.h>
diff --git a/backport/compat/backport-4.0.c b/backport/compat/backport-4.0.c
index 8ae16115..71095f19 100644
--- a/backport/compat/backport-4.0.c
+++ b/backport/compat/backport-4.0.c
@@ -14,6 +14,8 @@
#include <linux/ctype.h>
#include <linux/printk.h>
#include <linux/export.h>
+#include <linux/trace_seq.h>
+#include <linux/ftrace_event.h>
#include <asm/unaligned.h>
static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
@@ -321,3 +323,47 @@ overflow1:
return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
}
EXPORT_SYMBOL_GPL(hex_dump_to_buffer);
+
+const char *
+ftrace_print_array_seq(struct trace_seq *p, const void *buf, int buf_len,
+ size_t el_size)
+{
+ const char *ret = trace_seq_buffer_ptr(p);
+ const char *prefix = "";
+ void *ptr = (void *)buf;
+
+ trace_seq_putc(p, '{');
+
+ while (ptr < buf + buf_len) {
+ switch (el_size) {
+ case 1:
+ trace_seq_printf(p, "%s0x%x", prefix,
+ *(u8 *)ptr);
+ break;
+ case 2:
+ trace_seq_printf(p, "%s0x%x", prefix,
+ *(u16 *)ptr);
+ break;
+ case 4:
+ trace_seq_printf(p, "%s0x%x", prefix,
+ *(u32 *)ptr);
+ break;
+ case 8:
+ trace_seq_printf(p, "%s0x%llx", prefix,
+ *(u64 *)ptr);
+ break;
+ default:
+ trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
+ *(u8 *)ptr);
+ el_size = 1;
+ }
+ prefix = ",";
+ ptr += el_size;
+ }
+
+ trace_seq_putc(p, '}');
+ trace_seq_putc(p, 0);
+
+ return ret;
+}
+EXPORT_SYMBOL(ftrace_print_array_seq);
--
2.11.0
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