[xen staging] x86/HPET: move legacy tick IRQ count adjustment

[patchbot@xxxxxxx]

commit bb34713d9a8916963561e6358843a9602c74ab1d
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Jan 22 14:11:10 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jan 22 16:06:22 2026 +0100

    x86/HPET: move legacy tick IRQ count adjustment
    
    If already we play with the IRQ count, we should do so only if we actually
    "consume" the interrupt; normal timer IRQs should not have any adjustment
    done.
    
    Fixes: 353533232730 ("cpuidle: fix the menu governor to enhance IO 
performance")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/hpet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hpet.c b/xen/arch/x86/hpet.c
index f34863e0df..a096547fe8 100644
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -808,13 +808,13 @@ int hpet_broadcast_is_available(void)
 
 int hpet_legacy_irq_tick(void)
 {
-    this_cpu(irq_count)--;
-
     if ( !hpet_events ||
          (hpet_events->flags & (HPET_EVT_DISABLE|HPET_EVT_LEGACY)) !=
          HPET_EVT_LEGACY )
         return 0;
 
+    this_cpu(irq_count)--;
+
     handle_hpet_broadcast(hpet_events);
 
     return 1;
--
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