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-rw-r--r--arch/x86/kernel/tsc.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 3d743da82..4b20bb75b 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -12,6 +12,7 @@
#include <linux/percpu.h>
#include <linux/timex.h>
#include <linux/static_key.h>
+#include <linux/mm.h>
#include <asm/hpet.h>
#include <asm/timer.h>
@@ -195,6 +196,10 @@ static void cyc2ns_init(int cpu)
c2n->head = c2n->data;
c2n->tail = c2n->data;
+
+ // Don't let TuxOnIce make data RO - a secondary CPU will cause a triple fault
+ // if it loads microcode, which then does a printk, which may end up invoking cycles_2_ns
+ SetPageTOI_Untracked(virt_to_page(c2n));
}
static inline unsigned long long cycles_2_ns(unsigned long long cyc)