[PATCH v13 7/7] arm64: smp: Mark IPI globals as __ro_after_init

[Douglas Anderson <dianders@chromium.org>]

Mark the three IPI-related globals in smp.c as "__ro_after_init" since
they are only ever set in set_smp_ipi_range(), which is marked
"__init". This is a better and more secure marking than the old
"__read_mostly".

Suggested-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
This patch is almost completely unrelated to the rest of the series
other than the fact that it would cause a merge conflict with the
series if sent separately. I tacked it on to this series in response
to Stephen's feedback on v11 of this series [1]. If someone hates it
(not sure why they would), it could be dropped. If someone loves it,
it could be promoted to the start of the series and/or land on its own
(resolving merge conflicts).

[1] https://lore.kernel.org/r/CAE-0n52iVDgZa8XT8KTMj12c_ESSJt7f7A0fuZ_oAMMqpGcSzA@mail.gmail.com

(no changes since v12)

Changes in v12:
- ("arm64: smp: Mark IPI globals as __ro_after_init") new for v12.

 arch/arm64/kernel/smp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 1a53e57c81d0..814d9aa93b21 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -84,9 +84,9 @@ enum ipi_msg_type {
 	MAX_IPI
 };
 
-static int ipi_irq_base __read_mostly;
-static int nr_ipi __read_mostly = NR_IPI;
-static struct irq_desc *ipi_desc[MAX_IPI] __read_mostly;
+static int ipi_irq_base __ro_after_init;
+static int nr_ipi __ro_after_init = NR_IPI;
+static struct irq_desc *ipi_desc[MAX_IPI] __ro_after_init;
 
 static void ipi_setup(int cpu);
 
-- 
2.42.0.283.g2d96d420d3-goog