linux-kernel - [PATCH 5/6] x86/msr: write_rdtscp_aux() to use wrmsr

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Date:   Mon,  4 Jun 2018 12:24:28 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Markus T Metzger <markus.t.metzger@...el.com>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        "Chang S . Bae" <chang.seok.bae@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/6] x86/msr: write_rdtscp_aux() to use wrmsr_safe()

Using wrmsr_safe() can make code a bit simpler by removing
some condition check

Suggested-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/msr.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 04addd6..09bec62 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -317,7 +317,7 @@ static inline int wrmsrl_safe(u32 msr, u64 val)
 
 #define write_tsc(low, high) wrmsr(MSR_IA32_TSC, (low), (high))
 
-#define write_rdtscp_aux(val) wrmsr(MSR_TSC_AUX, (val), 0)
+#define write_rdtscp_aux(val) wrmsr_safe(MSR_TSC_AUX, (val), 0)
 
 struct msr *msrs_alloc(void);
 void msrs_free(struct msr *msrs);
-- 
2.7.4