[RFC PATCH] apic: drop useless apic_read

[Cao jin]

APIC ESR register reading doesn't clear its content.

Signed-off-by: Cao jin <caoj.fnst@xxxxxxxxxxxxxx>
---
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