[PATCH v2] ring-buffer: report header_page overwrite as char

Cao Ruichuang
2026-04-06T16:54:09Z

The header_page tracefs metadata currently reports overwrite as an
int field with size 1. That makes parsers warn about a type and
size mismatch even though the field is only used as a one-byte flag
within commit.

Keep the shared offset with commit as-is, but report overwrite as
char so the declared type matches the hardcoded size. The signedness
is already carried separately by the emitted signed field.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216999
Signed-off-by: Cao Ruichuang <create0818@163.com>
---
kernel/trace/ring_buffer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 170170bd8..6811dfffa 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -627,11 +627,11 @@ int ring_buffer_print_page_header(struct trace_buffer *buffer, struct trace_seq
(unsigned int)sizeof(field.commit),
(unsigned int)is_signed_type(long));

- trace_seq_printf(s, "\tfield: int overwrite;\t"
+ trace_seq_printf(s, "\tfield: char overwrite;\t"
"offset:%u;\tsize:%u;\tsigned:%u;\n",
(unsigned int)offsetof(typeof(field), commit),
1,
- (unsigned int)is_signed_type(long));
+ (unsigned int)is_signed_type(char));

trace_seq_printf(s, "\tfield: char data;\t"
"offset:%u;\tsize:%u;\tsigned:%u;\n",
--
2.39.5 (Apple Git-154)