5 files changed, 51 insertions, 6 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 015dd1049bea..770f0dc993cc 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -1167,17 +1167,14 @@ static inline void ftrace_init(void) { }
  */
 struct ftrace_graph_ent {
 	unsigned long func; /* Current function */
-	int depth;
+	unsigned long depth;
 } __packed;
 
 /*
  * Structure that defines an entry function trace with retaddr.
- * It's already packed but the attribute "packed" is needed
- * to remove extra padding at the end.
  */
 struct fgraph_retaddr_ent {
-	unsigned long func; /* Current function */
-	int depth;
+	struct ftrace_graph_ent ent;
 	unsigned long retaddr;  /* Return address */
 } __packed;
 
diff --git a/include/linux/overflow.h b/include/linux/overflow.h
index 725f95f7e416..736f633b2d5f 100644
--- a/include/linux/overflow.h
+++ b/include/linux/overflow.h
@@ -459,6 +459,18 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend)
 	struct_size((type *)NULL, member, count)
 
 /**
+ * struct_offset() - Calculate the offset of a member within a struct
+ * @p: Pointer to the struct
+ * @member: Name of the member to get the offset of
+ *
+ * Calculates the offset of a particular @member of the structure pointed
+ * to by @p.
+ *
+ * Return: number of bytes to the location of @member.
+ */
+#define struct_offset(p, member) (offsetof(typeof(*(p)), member))
+
+/**
  * __DEFINE_FLEX() - helper macro for DEFINE_FLEX() family.
  * Enables caller macro to pass arbitrary trailing expressions
  *
diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index 52791e070506..9f2839e73f8a 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -149,6 +149,23 @@ static inline void seq_buf_commit(struct seq_buf *s, int num)
 	}
 }
 
+/**
+ * seq_buf_pop - pop off the last written character
+ * @s: the seq_buf handle
+ *
+ * Removes the last written character to the seq_buf @s.
+ *
+ * Returns the last character or -1 if it is empty.
+ */
+static inline int seq_buf_pop(struct seq_buf *s)
+{
+	if (!s->len)
+		return -1;
+
+	s->len--;
+	return (unsigned int)s->buffer[s->len];
+}
+
 extern __printf(2, 3)
 int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
 extern __printf(2, 0)
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
index 557780fe1c77..4a0b8c172d27 100644
--- a/include/linux/trace_seq.h
+++ b/include/linux/trace_seq.h
@@ -80,6 +80,19 @@ static inline bool trace_seq_has_overflowed(struct trace_seq *s)
 	return s->full || seq_buf_has_overflowed(&s->seq);
 }
 
+/**
+ * trace_seq_pop - pop off the last written character
+ * @s: trace sequence descriptor
+ *
+ * Removes the last written character to the trace_seq @s.
+ *
+ * Returns the last character or -1 if it is empty.
+ */
+static inline int trace_seq_pop(struct trace_seq *s)
+{
+	return seq_buf_pop(&s->seq);
+}
+
 /*
  * Currently only defined when tracing is enabled.
  */
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index 8e193f3a33b3..0dd7f2b33431 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -16,6 +16,9 @@
  * @name: name of the syscall
  * @syscall_nr: number of the syscall
  * @nb_args: number of parameters it takes
+ * @user_arg_is_str: set if the arg for @user_arg_size is a string
+ * @user_arg_size: holds @arg that has size of the user space to read
+ * @user_mask: mask of @args that will read user space
  * @types: list of types as strings
  * @args: list of args as strings (args[i] matches types[i])
  * @enter_fields: list of fields for syscall_enter trace event
@@ -25,7 +28,10 @@
 struct syscall_metadata {
 	const char	*name;
 	int		syscall_nr;
-	int		nb_args;
+	u8		nb_args:7;
+	u8		user_arg_is_str:1;
+	s8		user_arg_size;
+	short		user_mask;
 	const char	**types;
 	const char	**args;
 	struct list_head enter_fields;