tracing: Remove trace_seq_reserve()

trace_seq_reserve() has no users in the kernel, it just wastes space.
Remove it.

Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

include/linux/trace_seq.h

@@ -43,7 +43,6 @@ extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len);
 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
 				unsigned int len);
-extern void *trace_seq_reserve(struct trace_seq *s, unsigned int len);
 extern int trace_seq_path(struct trace_seq *s, const struct path *path);
 
 extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
@@ -94,10 +93,6 @@ static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
 {
 	return 0;
 }
-static inline void *trace_seq_reserve(struct trace_seq *s, unsigned int len)
-{
-	return NULL;
-}
 static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
 {
 	return 0;

kernel/trace/trace_seq.c

@@ -341,36 +341,6 @@ int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
 }
 EXPORT_SYMBOL_GPL(trace_seq_putmem_hex);
 
-/**
- * trace_seq_reserve - reserve space on the sequence buffer
- * @s: trace sequence descriptor
- * @len: The amount to reserver.
- *
- * If for some reason there is a need to save some space on the
- * buffer to fill in later, this function is used for that purpose.
- * The given length will be reserved and the pointer to that
- * location on the buffer is returned, unless there is not enough
- * buffer left to hold the given length then NULL is returned.
- */
-void *trace_seq_reserve(struct trace_seq *s, unsigned int len)
-{
-	void *ret;
-
-	if (s->full)
-		return NULL;
-
-	if (len > TRACE_SEQ_BUF_LEFT(s)) {
-		s->full = 1;
-		return NULL;
-	}
-
-	ret = s->buffer + s->len;
-	s->len += len;
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(trace_seq_reserve);
-
 /**
  * trace_seq_path - copy a path into the sequence buffer
  * @s: trace sequence descriptor