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Subject[PATCH 3.8-rc4-nohz3] kvm: Add missing include and EXPORT_SYMBOL_GPL
Date
When CONFIG_KVM=m my build with 3.8-rc4-nohz3 breaks like this:

ERROR: "guest_enter" [arch/x86/kvm/kvm.ko] undefined!
ERROR: "guest_exit" [arch/x86/kvm/kvm.ko] undefined!

Fix this by removing the CONFIG_KVM ifdefs and adding missing
EXPORT_SYMBOL_GPL for:
+ guest_enter() and guest_exit()
+ vtime_guest_enter() and vtime_guest_exit()

Also add a missing include:
+ Add <linux/export.h> to kernel/context_tracking.c

This issue was introduced with commit 8eebafe9be58 ("kvm: Prepare to
add generic guest entry/exit callbacks").

With some help of funny "i™"X86 hackerz!

Tested on a Ubuntu/precise AMD64 with 'CONFIG_KVM=m'.

[ vUNKNOWN: Without the magic "i" hack. -dileks ]
[ vUNKNOWN+1: Remove vtime.h from kvm_host.h. -dileks ]
[ vUNKNOWN+2: Re-add some removed empty lines. -dileks ]

Signed-off-by: Sedat Dilek <sedat.dilek@gmail.com>
---
kernel/context_tracking.c | 5 +++--
kernel/sched/cputime.c | 4 ++--
2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index bbb2c2c..dd38fde 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -19,6 +19,7 @@
#include <linux/rcupdate.h>
#include <linux/sched.h>
#include <linux/hardirq.h>
+#include <linux/export.h>


DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
@@ -103,7 +104,6 @@ void user_exit(void)
local_irq_restore(flags);
}

-#ifdef CONFIG_KVM
void guest_enter(void)
{
if (vtime_accounting_enabled())
@@ -111,6 +111,7 @@ void guest_enter(void)
else
__guest_enter();
}
+EXPORT_SYMBOL_GPL(guest_enter);

void guest_exit(void)
{
@@ -119,7 +120,7 @@ void guest_exit(void)
else
__guest_exit();
}
-#endif
+EXPORT_SYMBOL_GPL(guest_exit);


/**
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 5500a81..dc66cba 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -677,7 +677,6 @@ void vtime_user_enter(struct task_struct *tsk)
write_sequnlock(&tsk->vtime_seqlock);
}

-#ifdef CONFIG_KVM
void vtime_guest_enter(struct task_struct *tsk)
{
write_seqlock(&tsk->vtime_seqlock);
@@ -685,6 +684,7 @@ void vtime_guest_enter(struct task_struct *tsk)
current->flags |= PF_VCPU;
write_sequnlock(&tsk->vtime_seqlock);
}
+EXPORT_SYMBOL_GPL(vtime_guest_enter);

void vtime_guest_exit(struct task_struct *tsk)
{
@@ -693,7 +693,7 @@ void vtime_guest_exit(struct task_struct *tsk)
current->flags &= ~PF_VCPU;
write_sequnlock(&tsk->vtime_seqlock);
}
-#endif
+EXPORT_SYMBOL_GPL(vtime_guest_exit);

void vtime_account_idle(struct task_struct *tsk)
{
--
1.8.1.1
--
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