linux-kernel - [PATCH] x86/build: Build VSMP support only if selected

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Date:   Thu, 1 Nov 2018 10:36:51 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Randy Dunlap <rdunlap@...radead.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>, broonie@...nel.org,
        mhocko@...e.cz, Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-next@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        mm-commits@...r.kernel.org,
        Ravikiran Thirumalai <kiran@...lemp.com>,
        Shai Fultheim <shai@...lemp.com>, X86 ML <x86@...nel.org>
Subject: [PATCH] x86/build: Build VSMP support only if selected

VSMP support is built even if CONFIG_X86_VSMP is not set. This leads to a build
breakage when CONFIG_PCI is disabled as well.

Build VSMP code only when selected.

Reported-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index ae13bc974416..b6b911c4c7f3 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -33,7 +33,7 @@
 extern u64 relocated_ramdisk;
 
 /* Interrupt control for vSMPowered x86_64 systems */
-#ifdef CONFIG_X86_64
+#if defined(CONFIG_X86_64) && defined(CONFIG_X86_VSMP)
 void vsmp_init(void);
 #else
 static inline void vsmp_init(void) { }
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 8824d01c0c35..647ce52b17d5 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -148,5 +148,5 @@ ifeq ($(CONFIG_X86_64),y)
 	obj-$(CONFIG_CALGARY_IOMMU)	+= pci-calgary_64.o tce_64.o
 
 	obj-$(CONFIG_MMCONF_FAM10H)	+= mmconf-fam10h_64.o
-	obj-y				+= vsmp_64.o
+	obj-$(CONFIG_X86_VSMP)		+= vsmp_64.o
 endif