Messages in this thread Patch in this message | | | From | Cao jin <> | Subject | [RFC PATCH] apic: drop useless apic_read | Date | Wed, 19 Apr 2017 17:28:29 +0800 |
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APIC ESR register reading doesn't clear its content.
Signed-off-by: Cao jin <caoj.fnst@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
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