Commit f35dbac69421 for kernel

commit f35dbac6942171dc4ce9398d1d216a59224590a9
Author: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Date:   Thu Mar 19 18:12:19 2026 +0900

    ring-buffer: Fix to update per-subbuf entries of persistent ring buffer

    Since the validation loop in rb_meta_validate_events() updates the same
    cpu_buffer->head_page->entries, the other subbuf entries are not updated.
    Fix to use head_page to update the entries field, since it is the cursor
    in this loop.

    Cc: stable@vger.kernel.org
    Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Cc: Ian Rogers <irogers@google.com>
    Fixes: 5f3b6e839f3c ("ring-buffer: Validate boot range memory events")
    Link: https://patch.msgid.link/177391153882.193994.17158784065013676533.stgit@mhiramat.tok.corp.google.com
    Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 17d0ea0cc3e6..170170bd83bd 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2053,7 +2053,7 @@ static void rb_meta_validate_events(struct ring_buffer_per_cpu *cpu_buffer)

 		entries += ret;
 		entry_bytes += local_read(&head_page->page->commit);
-		local_set(&cpu_buffer->head_page->entries, ret);
+		local_set(&head_page->entries, ret);

 		if (head_page == cpu_buffer->commit_page)
 			break;