linux-kernel - [PATCH 1/2] kvm: x86: add likely to sched_info

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Date:   Thu, 4 Jul 2019 19:46:14 +0800
From:   Yi Wang <wang.yi59@....com.cn>
To:     pbonzini@...hat.com
Cc:     rkrcmar@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        xue.zhihong@....com.cn, wang.yi59@....com.cn, up2wing@...il.com,
        wang.liang82@....com.cn
Subject: [PATCH 1/2] kvm: x86: add likely to sched_info_on()

The condition to test is likely() to be true when make defconfig.
Add the hint.

Signed-off-by: Yi Wang <wang.yi59@....com.cn>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 4992e7c..64fff41 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -642,7 +642,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 			     (1 << KVM_FEATURE_ASYNC_PF_VMEXIT) |
 			     (1 << KVM_FEATURE_PV_SEND_IPI);
 
-		if (sched_info_on())
+		if (likely(sched_info_on()))
 			entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
 
 		entry->ebx = 0;
-- 
1.8.3.1