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

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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: 5f3b6e839f ("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>
This commit is contained in:
Masami Hiramatsu (Google) 2026-03-19 18:12:19 +09:00 committed by Steven Rostedt (Google)
parent 07183aac4a
commit f35dbac694
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/ring_buffer.c
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@ -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;