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[PULL,kvm-unit-tests,05/10] arm64: timer: Make irq_received volatile

Message ID 20200206162434.14624-6-drjones@redhat.com (mailing list archive)
State New, archived
Headers show
Series [PULL,kvm-unit-tests,01/10] Makefile: Use no-stack-protector compiler options | expand

Commit Message

Andrew Jones Feb. 6, 2020, 4:24 p.m. UTC 
From: Alexandru Elisei <alexandru.elisei@arm.com>

The irq_received field is modified by the interrupt handler. Make it
volatile so that the compiler doesn't reorder accesses with regard to
the instruction that will be causing the interrupt.

Suggested-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 arm/timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arm/timer.c b/arm/timer.c
index e758e84855c3..82f891147b35 100644
--- a/arm/timer.c
+++ b/arm/timer.c
@@ -109,7 +109,7 @@  static void write_ptimer_ctl(u64 val)
 struct timer_info {
 	u32 irq;
 	u32 irq_flags;
-	bool irq_received;
+	volatile bool irq_received;
 	u64 (*read_counter)(void);
 	u64 (*read_cval)(void);
 	void (*write_cval)(u64);