From ca7b8ae031d9ce12139d96caedc5d1bd369feeca Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Wed, 15 Feb 2023 10:59:42 +0100
Subject: smp: Fix more busy loops

We need to avoid the kernel optimizing away the reads from
memory. Use a standard relaxing instruction for that.
---
 kern/eventcount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kern/eventcount.c')

diff --git a/kern/eventcount.c b/kern/eventcount.c
index a9d7bd41..3a96b4fb 100644
--- a/kern/eventcount.c
+++ b/kern/eventcount.c
@@ -244,7 +244,7 @@ evc_signal(evc_t ev)
 #if (NCPUS > 1)
       retry:
 	while((thread->state & TH_RUN) || thread->lock.lock_data)
-		;
+		cpu_pause();
 #endif
 	thread_lock(thread);
 
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