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From: Shreenidhi Shedi <yesshedi@gmail.com>
To: srivatsa@csail.mit.edu, amakhalov@vmware.com, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
	hpa@zytor.com
Cc: virtualization@lists.linux-foundation.org, pv-drivers@vmware.com,
	x86@kernel.org, linux-kernel@vger.kernel.org, yesshedi@gmail.com,
	stable@vger.kernel.org, Shreenidhi Shedi <sshedi@vmware.com>
Subject: [PATCH v3] x86/vmware: use unsigned integer for shifting
Date: Fri, 27 May 2022 23:27:37 +0530	[thread overview]
Message-ID: <20220527175737.915284-1-sshedi@vmware.com> (raw)

From: Shreenidhi Shedi <sshedi@vmware.com>

Shifting signed 32-bit value by 31 bits is implementation-defined
behaviour. Using unsigned is better option for this.

Fixes: 4cca6ea04d31 ("x86/apic: Allow x2apic without IR on VMware platform")
Cc: stable@vger.kernel.org
Signed-off-by: Shreenidhi Shedi <sshedi@vmware.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


             reply	other threads:[~2022-05-27 17:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-27 17:57 Shreenidhi Shedi [this message]
2022-05-28 13:52 ` Peter Zijlstra
2022-05-31 12:51   ` Srivatsa S. Bhat

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