APIC ESR register reading doesn't clear its content.
Signed-off-by: Cao jin <caoj.f...@cn.fujitsu.com>
---
It is also a question represented by a patch: Intel developer manual
doesn't say reading will clear it content, so why read it here?
arch/x86/kernel/apic/apic.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 8ccb7ef..1742324 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1065,7 +1065,6 @@ void clear_local_APIC(void)
if (maxlvt > 3)
/* Clear ESR due to Pentium errata 3AP and 11AP */
apic_write(APIC_ESR, 0);
- apic_read(APIC_ESR);
}
}
--
2.1.0
