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[PATCH v3 8/9] x86/HPET: drop "long timeout" handling from reprogram_hpet_evt_channel()
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 23 Oct 2025 17:52:53 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 23 Oct 2025 15:57:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Neither caller passes STIME_MAX, so (bogusly) handling the case isn't
necessary.
"Bogusly" because with 32-bit counters, writing 0 means on average half
the wrapping period until an interrupt would be raised, while of course
in extreme cases an interrupt would be raised almost right away.
Amends: aa42fc0e9cd9 ("cpuidle: remove hpet access in hpet_broadcast_exit")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v3: Drop the code instead of adjusting it.
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -162,13 +162,6 @@ static int reprogram_hpet_evt_channel(
ch->next_event = expire;
- if ( expire == STIME_MAX )
- {
- /* We assume it will take a long time for the timer to wrap. */
- hpet_write32(0, HPET_Tn_CMP(ch->idx));
- return 0;
- }
-
delta = min_t(int64_t, delta, MAX_DELTA_NS);
delta = max_t(int64_t, delta, MIN_DELTA_NS);
delta = ns2ticks(delta, ch->shift, ch->mult);
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