[PATCH v2 07/11] powerpc: Annotate accesses to ipi message flags

[Rohan McLure]

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 at linux.ibm.com>
---
v2: Add missing WRITE_ONCE() in smp_muxed_ipi_set_message().
---
 arch/powerpc/kernel/smp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 6b90f10a6c81..fb35a147b4fa 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -289,7 +289,7 @@ void smp_muxed_ipi_set_message(int cpu, int msg)
 	 * Order previous accesses before accesses in the IPI handler.
 	 */
 	smp_mb();
-	message[msg] = 1;
+	WRITE_ONCE(message[msg], 1);
 }
 
 void smp_muxed_ipi_message_pass(int cpu, int msg)
@@ -348,7 +348,7 @@ irqreturn_t smp_ipi_demux_relaxed(void)
 		if (all & IPI_MESSAGE(PPC_MSG_NMI_IPI))
 			nmi_ipi_action(0, NULL);
 #endif
-	} while (info->messages);
+	} while (READ_ONCE(info->messages));
 
 	return IRQ_HANDLED;
 }
-- 
2.37.2