linux-kernel - [PATCH v7 08/13] arch/x86: Add vendor check for MBA software controller

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Message-ID: <20181109205153.14811-9-babu.moger@amd.com>
Date:   Fri, 9 Nov 2018 20:52:39 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
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Subject: [PATCH v7 08/13] arch/x86: Add vendor check for MBA software
 controller

MBA software controller support is available only on Intel.

Suggested-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl_rdtgroup.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl_rdtgroup.c b/arch/x86/kernel/cpu/resctrl_rdtgroup.c
index 8b6b4a8bb7ca..022a56096024 100644
--- a/arch/x86/kernel/cpu/resctrl_rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl_rdtgroup.c
@@ -1878,7 +1878,10 @@ static int parse_rdtgroupfs_options(char *data)
 			if (ret)
 				goto out;
 		} else if (!strcmp(token, "mba_MBps")) {
-			ret = set_mba_sc(true);
+			if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+				ret = set_mba_sc(true);
+			else
+				ret = -EINVAL;
 			if (ret)
 				goto out;
 		} else {
-- 
2.17.1