powerpc: Annotate accesses to ipi message flags

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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 <rmclure@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230510033117.1395895-8-rmclure@linux.ibm.com

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Rohan McLure 2023-05-10 13:31:13 +10:00 • committed by Michael Ellerman

parent b0c5b4f1ee

commit 8608f14b49

1 changed files with 2 additions and 2 deletions

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arch/powerpc/kernel/smp.c

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