linux-kernel - [tip: x86/entry] xen: Move xen_setup_callback_vector() definition to include/xen/hvm.h

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Message-ID: <159067336218.17951.8587192036769603306.tip-bot2@tip-bot2>
Date:   Thu, 28 May 2020 13:42:42 -0000
From:   "tip-bot2 for Vitaly Kuznetsov" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     kbuild test robot <lkp@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juergen Gross <jgross@...e.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/entry] xen: Move xen_setup_callback_vector() definition to
 include/xen/hvm.h

The following commit has been merged into the x86/entry branch of tip:

Commit-ID:     28447ea4154239025044381144f849ff749ee9ef
Gitweb:        https://git.kernel.org/tip/28447ea4154239025044381144f849ff749ee9ef
Author:        Vitaly Kuznetsov <vkuznets@...hat.com>
AuthorDate:    Wed, 20 May 2020 18:16:00 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 28 May 2020 15:39:18 +02:00

xen: Move xen_setup_callback_vector() definition to include/xen/hvm.h

Kbuild test robot reports the following problem on ARM:

  for 'xen_setup_callback_vector' [-Wmissing-prototypes]
1664 | void xen_setup_callback_vector(void) {}
|      ^~~~~~~~~~~~~~~~~~~~~~~~~

The problem is that xen_setup_callback_vector is a x86 only thing, its
definition is present in arch/x86/xen/xen-ops.h but not on ARM. In
events_base.c there is a stub for !CONFIG_XEN_PVHVM but it is not declared
as 'static'.

On x86 the situation is hardly better: drivers/xen/events/events_base.c
doesn't include 'xen-ops.h' from arch/x86/xen/, it includes its namesake
from include/xen/ which also results in a 'no previous prototype' warning.

Currently, xen_setup_callback_vector() has two call sites: one in
drivers/xen/events_base.c and another in arch/x86/xen/suspend_hvm.c. The
former is placed under #ifdef CONFIG_X86 and the later is only compiled
in when CONFIG_XEN_PVHVM.

Resolve the issue by moving xen_setup_callback_vector() declaration to
arch neutral 'include/xen/hvm.h' as the implementation lives in arch
neutral drivers/xen/events/events_base.c.

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Juergen Gross <jgross@...e.com>
Link: https://lkml.kernel.org/r/20200520161600.361895-1-vkuznets@redhat.com

---
 arch/x86/xen/suspend_hvm.c | 1 +
 arch/x86/xen/xen-ops.h     | 1 -
 include/xen/hvm.h          | 2 ++
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/suspend_hvm.c b/arch/x86/xen/suspend_hvm.c
index 5152afe..9d548b0 100644
--- a/arch/x86/xen/suspend_hvm.c
+++ b/arch/x86/xen/suspend_hvm.c
@@ -2,6 +2,7 @@
 #include <linux/types.h>
 
 #include <xen/xen.h>
+#include <xen/hvm.h>
 #include <xen/features.h>
 #include <xen/interface/features.h>
 
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index ad05d05..53b224f 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -54,7 +54,6 @@ void xen_enable_sysenter(void);
 void xen_enable_syscall(void);
 void xen_vcpu_restore(void);
 
-void xen_setup_callback_vector(void);
 void xen_hvm_init_shared_info(void);
 void xen_unplug_emulated_devices(void);
 
diff --git a/include/xen/hvm.h b/include/xen/hvm.h
index 0b15f8c..b7fd7fc 100644
--- a/include/xen/hvm.h
+++ b/include/xen/hvm.h
@@ -58,4 +58,6 @@ static inline int hvm_get_parameter(int idx, uint64_t *value)
 #define HVM_CALLBACK_VECTOR(x) (((uint64_t)HVM_CALLBACK_VIA_TYPE_VECTOR)<<\
 		HVM_CALLBACK_VIA_TYPE_SHIFT | (x))
 
+void xen_setup_callback_vector(void);
+
 #endif /* XEN_HVM_H__ */