openwrt/target/linux/ramips/patches-5.4/110-mt7621-perfctr-fix.patch

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--- a/arch/mips/ralink/irq-gic.c
+++ b/arch/mips/ralink/irq-gic.c
@@ -15,6 +15,12 @@
int get_c0_perfcount_int(void)
{
+ /*
+ * Performance counter events are routed through GIC.
+ * Prevent them from firing on CPU IRQ7 as well
+ */
+ clear_c0_status(IE_SW0 << 7);
+
return gic_get_c0_perfcount_int();
}
EXPORT_SYMBOL_GPL(get_c0_perfcount_int);