linux-kernel - [PATCH v4] x86/vmware: use BIT() macro for shifting

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Message-Id: <20220601101820.535031-1-sshedi@vmware.com>
Date:   Wed,  1 Jun 2022 15:48:20 +0530
From:   Shreenidhi Shedi <yesshedi@...il.com>
To:     srivatsa@...il.mit.edu, amakhalov@...are.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com
Cc:     yesshedi@...il.com, pv-drivers@...are.com, x86@...nel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Shreenidhi Shedi <sshedi@...are.com>
Subject: [PATCH v4] x86/vmware: use BIT() macro for shifting

From: Shreenidhi Shedi <sshedi@...are.com>

Using BIT() macro improves readability & it uses unsigned long for
shifting which is an added advantage.

Kernel builds with -fno-strict-overflow CFLAG hence shifting a signed
integer by 31 bits is not an issue in this case.

Signed-off-by: Shreenidhi Shedi <sshedi@...are.com>
---
 arch/x86/kernel/cpu/vmware.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index c04b933f4..02039ec35 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -476,8 +476,8 @@ static bool __init vmware_legacy_x2apic_available(void)
 {
 	uint32_t eax, ebx, ecx, edx;
 	VMWARE_CMD(GETVCPU_INFO, eax, ebx, ecx, edx);
-	return (eax & (1 << VMWARE_CMD_VCPU_RESERVED)) == 0 &&
-	       (eax & (1 << VMWARE_CMD_LEGACY_X2APIC)) != 0;
+	return !(eax & BIT(VMWARE_CMD_VCPU_RESERVED)) &&
+		(eax & BIT(VMWARE_CMD_LEGACY_X2APIC));
 }

 #ifdef CONFIG_AMD_MEM_ENCRYPT
--
2.36.1