1 files changed, 16 insertions, 3 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 19261fdd2455..d72b9a63b247 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -137,7 +137,7 @@ int trace_seq_putc(struct trace_seq *s, unsigned char c)
         return 1;
 }
 
-int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
+int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 {
         if (len > ((PAGE_SIZE - 1) - s->len))
                 return 0;
@@ -148,10 +148,10 @@ int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
         return len;
 }
 
-int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
+int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 {
         unsigned char hex[HEX_CHARS];
-        unsigned char *data = mem;
+        const unsigned char *data = mem;
         int i, j;
 
 #ifdef __BIG_ENDIAN
@@ -167,6 +167,19 @@ int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
         return trace_seq_putmem(s, hex, j);
 }
 
+void *trace_seq_reserve(struct trace_seq *s, size_t len)
+{
+        void *ret;
+
+        if (len > ((PAGE_SIZE - 1) - s->len))
+                return NULL;
+
+        ret = s->buffer + s->len;
+        s->len += len;
+
+        return ret;
+}
+
 int trace_seq_path(struct trace_seq *s, struct path *path)
 {
         unsigned char *p;