linux-kernel - [tip:x86/platform] x86/hyper-v: Include hyperv/ only when CONFIG

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Message-ID: <tip-79cadff2d92bb8b1448f6dba6861d15adc3dc4cb@git.kernel.org>
Date:   Thu, 10 Aug 2017 09:37:11 -0700
From:   tip-bot for Vitaly Kuznetsov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     kys@...rosoft.com, vkuznets@...hat.com, sthemmin@...rosoft.com,
        hpa@...or.com, sixiao@...rosoft.com, torvalds@...ux-foundation.org,
        andy.shevchenko@...il.com, luto@...nel.org, mingo@...nel.org,
        Jork.Loeser@...rosoft.com, linux-kernel@...r.kernel.org,
        haiyangz@...rosoft.com, rostedt@...dmis.org, peterz@...radead.org,
        tglx@...utronix.de
Subject: [tip:x86/platform] x86/hyper-v: Include hyperv/ only when
 CONFIG_HYPERV is set

Commit-ID:  79cadff2d92bb8b1448f6dba6861d15adc3dc4cb
Gitweb:     http://git.kernel.org/tip/79cadff2d92bb8b1448f6dba6861d15adc3dc4cb
Author:     Vitaly Kuznetsov <vkuznets@...hat.com>
AuthorDate: Wed, 2 Aug 2017 18:09:13 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 10 Aug 2017 16:50:22 +0200

x86/hyper-v: Include hyperv/ only when CONFIG_HYPERV is set

Code is arch/x86/hyperv/ is only needed when CONFIG_HYPERV is set, the
'basic' support and detection lives in arch/x86/kernel/cpu/mshyperv.c
which is included when CONFIG_HYPERVISOR_GUEST is set.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Stephen Hemminger <sthemmin@...rosoft.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: Jork Loeser <Jork.Loeser@...rosoft.com>
Cc: K. Y. Srinivasan <kys@...rosoft.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Simon Xiao <sixiao@...rosoft.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: devel@...uxdriverproject.org
Link: http://lkml.kernel.org/r/20170802160921.21791-2-vkuznets@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/Kbuild                 | 2 +-
 arch/x86/include/asm/mshyperv.h | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
index 586b786..3e6f640 100644
--- a/arch/x86/Kbuild
+++ b/arch/x86/Kbuild
@@ -8,7 +8,7 @@ obj-$(CONFIG_KVM) += kvm/
 obj-$(CONFIG_XEN) += xen/
 
 # Hyper-V paravirtualization support
-obj-$(CONFIG_HYPERVISOR_GUEST) += hyperv/
+obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/
 
 # lguest paravirtualization support
 obj-$(CONFIG_LGUEST_GUEST) += lguest/
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 2b58c8c..baea267 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -173,7 +173,12 @@ void hyperv_init(void);
 void hyperv_report_panic(struct pt_regs *regs);
 bool hv_is_hypercall_page_setup(void);
 void hyperv_cleanup(void);
-#endif
+#else /* CONFIG_HYPERV */
+static inline void hyperv_init(void) {}
+static inline bool hv_is_hypercall_page_setup(void) { return false; }
+static inline void hyperv_cleanup(void) {}
+#endif /* CONFIG_HYPERV */
+
 #ifdef CONFIG_HYPERV_TSCPAGE
 struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
 static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)