[PATCH 4.19 211/346] seq_buf: Avoid type mismatch for seq_buf_init

[Greg Kroah-Hartman]

From: Arnd Bergmann <arnd@xxxxxxxx>

[ Upstream commit d9a9280a0d0ae51dc1d4142138b99242b7ec8ac6 ]

Building with W=2 prints a number of warnings for one function that
has a pointer type mismatch:

linux/seq_buf.h: In function 'seq_buf_init':
linux/seq_buf.h:35:12: warning: pointer targets in assignment from 'unsigned char *' to 'char *' differ in signedness [-Wpointer-sign]

Change the type in the function prototype according to the type in
the structure.

Link: https://lkml.kernel.org/r/20201026161108.3707783-1-arnd@xxxxxxxxxx

Fixes: 9a7777935c34 ("tracing: Convert seq_buf fields to be like seq_file fields")
Reviewed-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 include/linux/seq_buf.h   | 2 +-
 include/linux/trace_seq.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index aa5deb041c25d..7cc952282e8be 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -30,7 +30,7 @@ static inline void seq_buf_clear(struct seq_buf *s)
 }
 
 static inline void
-seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size)
+seq_buf_init(struct seq_buf *s, char *buf, unsigned int size)
 {
 	s->buffer = buf;
 	s->size = size;
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
index 6609b39a72326..6db257466af68 100644
--- a/include/linux/trace_seq.h
+++ b/include/linux/trace_seq.h
@@ -12,7 +12,7 @@
  */
 
 struct trace_seq {
-	unsigned char		buffer[PAGE_SIZE];
+	char			buffer[PAGE_SIZE];
 	struct seq_buf		seq;
 	int			full;
 };
@@ -51,7 +51,7 @@ static inline int trace_seq_used(struct trace_seq *s)
  * that is about to be written to and then return the result
  * of that write.
  */
-static inline unsigned char *
+static inline char *
 trace_seq_buffer_ptr(struct trace_seq *s)
 {
 	return s->buffer + seq_buf_used(&s->seq);
-- 
2.27.0