[PATCH] arm64: irq: include <linux/cpumask.h>

[Tudor Ambarus]

Sorting include files in alphabetic order in
drivers/tty/serial/samsung.c revealed the following error:

In file included from drivers/tty/serial/samsung_tty.c:24:
./arch/arm64/include/asm/irq.h:9:43: error: unknown type name ‘cpumask_t’
    9 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu);
      |                                           ^~~~~~~~~

Include cpumask.h to avod unknown type errors for parents of irq.h that
don't include cpumask.h.

Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
---
 arch/arm64/include/asm/irq.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
index 50ce8b697ff3..d5612bc770da 100644
--- a/arch/arm64/include/asm/irq.h
+++ b/arch/arm64/include/asm/irq.h
@@ -5,6 +5,7 @@
 #ifndef __ASSEMBLER__
 
 #include <asm-generic/irq.h>
+#include <linux/cpumask.h>
 
 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu);
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
-- 
2.43.0.472.g3155946c3a-goog