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ring-buffer: Fix reader page read offset for remote buffers

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A page swapped in by __rb_get_reader_page_from_remote() retains its
stale read offset, causing subsequent reads to skip events or read
past valid data. Fix it.

Link: https://patch.msgid.link/20260729133609.4022734-1-vdonnefort@google.com
Fixes: fbd1743ecb ("ring-buffer: Add non-consuming read for ring-buffer remotes")
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Reviewed-by: Keir Fraser <keirf@google.com>
Tested-by: Keir Fraser <keirf@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Vincent Donnefort
2026-07-29 14:36:09 +01:00
committed by Steven Rostedt
parent c22c7b735f
commit 78cd56c2a9
1 changed files with 1 additions and 0 deletions
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1
kernel/trace/ring_buffer.c
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@@ -5783,6 +5783,7 @@ __rb_get_reader_page_from_remote(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->head_page = new_head;
cpu_buffer->reader_page = new_reader;
cpu_buffer->reader_page->read = 0;
cpu_buffer->pages = &new_head->list;
cpu_buffer->read_stamp = new_reader->page->time_stamp;
cpu_buffer->lost_events = cpu_buffer->meta_page->reader.lost_events;