[PATCH 3/3] common/softirq: address violation of MISRA C Rule 13.6

[Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>]

In the file common/softirq macro set_bit is called with argument
smp_processor_id.
Once expanded this set_bit's argument is used in sizeof operations
and thus 'smp_processor_id', being a macro that expands to a
function call with potential side effects, generates a violation.

To address this violation the value of smp_processor_id is therefore
stored in a variable called 'cpu' before passing it to macro set_bit.

No functional change.

Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>
---
 xen/common/softirq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/common/softirq.c b/xen/common/softirq.c
index bee4a82009..c5f3870534 100644
--- a/xen/common/softirq.c
+++ b/xen/common/softirq.c
@@ -139,7 +139,8 @@ void cpu_raise_softirq_batch_finish(void)
 
 void raise_softirq(unsigned int nr)
 {
-    set_bit(nr, &softirq_pending(smp_processor_id()));
+    unsigned int cpu = smp_processor_id();
+    set_bit(nr, &softirq_pending(cpu));
 }
 
 /*
-- 
2.34.1