Re: [PATCH] tracing: move buffer in trace_seq to end of struct

[Steven Rostedt]

On Thu, 21 Aug 2025 11:32:17 -0700
Elijah <me@elijahs.space> wrote:

> can we maybe encode the overflow state in seq_buf? check if 
> seq_buf_has_overflowed and clamp len back to the used size 
> (seq_buf_used) in a helper?

I could add a bit to the size?

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index 52791e070506..ea4996851901 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -20,8 +20,9 @@
  */
 struct seq_buf {
        char                    *buffer;
-       size_t                  size;
-       size_t                  len;
+       unsigned int            size;
+       unsigned int            len:31;
+       unsigned int            full:1;
 };
 
 #define DECLARE_SEQ_BUF(NAME, SIZE)                    \


-- Steve