tjh.dev / kernel
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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>

authored by

Masami Hiramatsu (Google) and committed by
Steven Rostedt (Google) f35dbac6 07183aac

+1 -1
+1 -1
kernel/trace/ring_buffer.c
··· 2053 2053 2054 2054 entries += ret; 2055 2055 entry_bytes += local_read(&head_page->page->commit); 2056 - local_set(&cpu_buffer->head_page->entries, ret); 2056 + local_set(&head_page->entries, ret); 2057 2057 2058 2058 if (head_page == cpu_buffer->commit_page) 2059 2059 break;