linux-kernel - [PATCH 1/1] x86/hyper-v: Fix 'set but not used' warnings

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Date:   Sat, 22 Dec 2018 00:06:58 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "sashal@...nel.org" <sashal@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        vkuznets <vkuznets@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>
CC:     Michael Kelley <mikelley@...rosoft.com>
Subject: [PATCH 1/1] x86/hyper-v: Fix 'set but not used' warnings

In these two cases, a value returned by rdmsr() or rdmsrl()
is ignored. Indicate that ignoring the value is intentional, so
that with the W=1 compilation option no warning is generated.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/hyperv/hv_apic.c     | 2 +-
 arch/x86/hyperv/hv_spinlock.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index 8eb6fbee..66a0f53 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -55,7 +55,7 @@ static void hv_apic_icr_write(u32 low, u32 id)
 
 static u32 hv_apic_read(u32 reg)
 {
-	u32 reg_val, hi;
+	u32 reg_val, __maybe_unused hi;
 
 	switch (reg) {
 	case APIC_EOI:
diff --git a/arch/x86/hyperv/hv_spinlock.c b/arch/x86/hyperv/hv_spinlock.c
index a861b04..e18c63d5 100644
--- a/arch/x86/hyperv/hv_spinlock.c
+++ b/arch/x86/hyperv/hv_spinlock.c
@@ -25,7 +25,7 @@ static void hv_qlock_kick(int cpu)
 
 static void hv_qlock_wait(u8 *byte, u8 val)
 {
-	unsigned long msr_val;
+	unsigned long __maybe_unused msr_val;
 	unsigned long flags;
 
 	if (in_nmi())
-- 
1.8.3.1