trace: make argument 'mem' of trace_seq_putmem() const

Impact: fix build warning

I passed a const value to trace_seq_putmem(), and I got compile warning.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 3 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 6595074cbac5..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