x86/mce/intel: Use MCG_BANKCNT_MASK instead of 0xff

JIRA: https://issues.redhat.com/browse/RHEL-113399

commit 754269c
Author: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Date:   Fri Oct 25 10:45:54 2024 +0800

    x86/mce/intel: Use MCG_BANKCNT_MASK instead of 0xff

    Use the predefined MCG_BANKCNT_MASK macro instead of the hardcoded
    0xff to mask the bank number bits.

    No functional changes intended.

    Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
    Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
    Reviewed-by: Tony Luck <tony.luck@intel.com>
    Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
    Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
    Link: https://lore.kernel.org/r/20241025024602.24318-3-qiuxu.zhuo@intel.com

Signed-off-by: Steve Best <sbest@redhat.com>

Author: sfbest

arch/x86/kernel/cpu/mce/intel.c

@@ -94,7 +94,7 @@ static int cmci_supported(int *banks)
 	if (!boot_cpu_has(X86_FEATURE_APIC) || lapic_get_maxlvt() < 6)
 		return 0;
 	rdmsrl(MSR_IA32_MCG_CAP, cap);
-	*banks = min_t(unsigned, MAX_NR_BANKS, cap & 0xff);
+	*banks = min_t(unsigned, MAX_NR_BANKS, cap & MCG_BANKCNT_MASK);
 	return !!(cap & MCG_CMCI_P);
 }