tracing: Non-consuming read for trace remotes with an offline CPU

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When a trace_buffer is created while a CPU is offline, this CPU is
cleared from the trace_buffer CPU mask, preventing the creation of a
non-consuming iterator (ring_buffer_iter). For trace remotes, it means
the iterator fails to be allocated (-ENOMEM) even though there are
available ring buffers in the trace_buffer.

For non-consuming reads of trace remotes, skip missing ring_buffer_iter
to allow reading the available ring buffers.

Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://patch.msgid.link/20260401045100.3394299-2-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Vincent Donnefort 2026-04-01 05:50:59 +01:00 • committed by Marc Zyngier

parent 58b4bd1839

commit ce47b798ed

1 changed files with 19 additions and 3 deletions

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kernel/trace/trace_remote.c

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