[PATCH] xen/irq: Delete the pirq_cleanup_check() macro

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

MISRA Rule 5.5 objects to a macro aliasing a function, which is what
pirq_cleanup_check() does.  The macro is an overly-complicated way of writing:

    if ( !pirq->evtchn )
        pirq_cleanup_check(pirq, d);

There are only a handful of users, so expand it inline to be plain regular C.

Doing this shows one path now needing braces, and one path in
evtchn_bind_pirq() where the expanded form simplies back to no delta, as it
follows an unconditional clear of info->evtchn.

No functional change; The compiled hypervisors are the same.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Anthony PERARD <anthony.perard@xxxxxxxxxx>
CC: Michal Orzel <michal.orzel@xxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Julien Grall <julien@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
CC: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>

Clearly the compiler had already found the simplification in
evtchn_bind_pirq().

Yes, I know I could integrate the !info->evtchn into the outer if() condition,
but that's an even bigger mess.
---
 xen/arch/x86/irq.c                | 11 +++++++----
 xen/common/event_channel.c        |  5 ++++-
 xen/drivers/passthrough/x86/hvm.c |  9 ++++++---
 xen/include/xen/irq.h             |  3 ---
 4 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 556134f85aa0..1ed85c0c114e 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -1325,7 +1325,8 @@ static void clear_domain_irq_pirq(struct domain *d, int 
irq, struct pirq *pirq)
 static void cleanup_domain_irq_pirq(struct domain *d, int irq,
                                     struct pirq *pirq)
 {
-    pirq_cleanup_check(pirq, d);
+    if ( !pirq->evtchn )
+        pirq_cleanup_check(pirq, d);
     radix_tree_delete(&d->arch.irq_pirq, irq);
 }
 
@@ -1383,7 +1384,7 @@ struct pirq *alloc_pirq_struct(struct domain *d)
     return pirq;
 }
 
-void (pirq_cleanup_check)(struct pirq *pirq, struct domain *d)
+void pirq_cleanup_check(struct pirq *pirq, struct domain *d)
 {
     /*
      * Check whether all fields have their default values, and delete
@@ -2823,7 +2824,8 @@ int map_domain_emuirq_pirq(struct domain *d, int pirq, 
int emuirq)
                 radix_tree_int_to_ptr(pirq));
             break;
         default:
-            pirq_cleanup_check(info, d);
+            if ( !info->evtchn )
+                pirq_cleanup_check(info, d);
             return err;
         }
     }
@@ -2858,7 +2860,8 @@ int unmap_domain_pirq_emuirq(struct domain *d, int pirq)
     if ( info )
     {
         info->arch.hvm.emuirq = IRQ_UNBOUND;
-        pirq_cleanup_check(info, d);
+        if ( !info->evtchn )
+            pirq_cleanup_check(info, d);
     }
     if ( emuirq != IRQ_PT )
         radix_tree_delete(&d->arch.hvm.emuirq_pirq, emuirq);
diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index c8c1bfa615df..ed48fbb55d67 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -741,11 +741,14 @@ int evtchn_close(struct domain *d1, int port1, bool guest)
             if ( !is_hvm_domain(d1) ||
                  domain_pirq_to_irq(d1, pirq->pirq) <= 0 ||
                  unmap_domain_pirq_emuirq(d1, pirq->pirq) < 0 )
+            {
                 /*
                  * The successful path of unmap_domain_pirq_emuirq() will have
                  * called pirq_cleanup_check() already.
                  */
-                pirq_cleanup_check(pirq, d1);
+                if ( !pirq->evtchn )
+                    pirq_cleanup_check(pirq, d1);
+            }
         }
         unlink_pirq_port(chn1, d1->vcpu[chn1->notify_vcpu_id]);
         break;
diff --git a/xen/drivers/passthrough/x86/hvm.c 
b/xen/drivers/passthrough/x86/hvm.c
index a2ca7e0e570c..b73bb550554d 100644
--- a/xen/drivers/passthrough/x86/hvm.c
+++ b/xen/drivers/passthrough/x86/hvm.c
@@ -329,7 +329,8 @@ int pt_irq_create_bind(
                 pirq_dpci->gmsi.gvec = 0;
                 pirq_dpci->dom = NULL;
                 pirq_dpci->flags = 0;
-                pirq_cleanup_check(info, d);
+                if ( !info->evtchn )
+                    pirq_cleanup_check(info, d);
                 write_unlock(&d->event_lock);
                 return rc;
             }
@@ -536,7 +537,8 @@ int pt_irq_create_bind(
                     hvm_irq_dpci->link_cnt[link]--;
                 }
                 pirq_dpci->flags = 0;
-                pirq_cleanup_check(info, d);
+                if ( !info->evtchn )
+                    pirq_cleanup_check(info, d);
                 write_unlock(&d->event_lock);
                 xfree(girq);
                 xfree(digl);
@@ -693,7 +695,8 @@ int pt_irq_destroy_bind(
          */
         pt_pirq_softirq_reset(pirq_dpci);
 
-        pirq_cleanup_check(pirq, d);
+        if ( !pirq->evtchn )
+            pirq_cleanup_check(pirq, d);
     }
 
     write_unlock(&d->event_lock);
diff --git a/xen/include/xen/irq.h b/xen/include/xen/irq.h
index 95034c0d6bb5..6071b00f621e 100644
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -185,9 +185,6 @@ extern struct pirq *pirq_get_info(struct domain *d, int 
pirq);
 
 void pirq_cleanup_check(struct pirq *pirq, struct domain *d);
 
-#define pirq_cleanup_check(pirq, d) \
-    (!(pirq)->evtchn ? pirq_cleanup_check(pirq, d) : (void)0)
-
 extern void pirq_guest_eoi(struct pirq *pirq);
 extern void desc_guest_eoi(struct irq_desc *desc, struct pirq *pirq);
 extern int pirq_guest_unmask(struct domain *d);

base-commit: b5070a959667d60e627017d44fc5b5b1c5e98777
-- 
2.39.5