On Wed May 10, 2023 at 1:31 PM AEST, Rohan McLure wrote:

IPI message flags are observed and consequently consumed in the
smp_ipi_demux_relaxed function, which handles these message sources
until it observes none more arriving. Mark the checked loop guard with
READ_ONCE, to signal to KCSAN that the read is known to be volatile, and
that non-determinism is expected. Mark write for message source in
smp_muxed_ipi_set_message().

Signed-off-by: Rohan McLure <redacted>

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>