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ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer()

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In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0.
This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if
when freed: free_buffer_page() relies on this value. Align the value
with the actual allocation size (buffer::subbuf_order).

Cc: stable@vger.kernel.org
Fixes: f9b94daa54 ("ring-buffer: Set new size of the ring buffer sub page")
Link: https://patch.msgid.link/20260806211306.3704194-4-vdonnefort@google.com
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Vincent Donnefort
2026-08-06 22:13:03 +01:00
committed by Steven Rostedt
parent bf98d7b0d5
commit 6d014e44b6
1 changed files with 1 additions and 0 deletions
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1
kernel/trace/ring_buffer.c
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@@ -2510,6 +2510,7 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, long nr_pages, int cpu)
bpage = alloc_cpu_page(cpu);
if (!bpage)
return NULL;
bpage->order = cpu_buffer->buffer->subbuf_order;
rb_check_bpage(cpu_buffer, bpage);