linux-kernel - [PATCH 3.8-rc4-nohz3] kvm: Add missing include and EXPORT_SYMBOL

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Wed, 23 Jan 2013 17:00:41 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Cc:	Sedat Dilek <sedat.dilek@...il.com>
Subject: [PATCH 3.8-rc4-nohz3] kvm: Add missing include and EXPORT_SYMBOL_GPL

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 missing includes:
+ Add <linux/export.h> to kernel/context_tracking.c
+ Add <linux/vtime.h> to include/linux/kvm_host.h

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

With some help of funny X86 hackerz!

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

[ vUNKNOWN: Without the magic "i" hack. -dileks ]

Signed-off-by: Sedat Dilek <sedat.dilek@...il.com>
---
 include/linux/kvm_host.h  | 1 +
 kernel/context_tracking.c | 7 +++----
 kernel/sched/cputime.c    | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b7996a7..3dd0be7 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -23,6 +23,7 @@
 #include <linux/ratelimit.h>
 #include <linux/err.h>
 #include <linux/irqflags.h>
+#include <linux/vtime.h>
 #include <asm/signal.h>
 
 #include <linux/kvm.h>
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index bbb2c2c..8802a66 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -19,7 +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) = {
 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
@@ -103,7 +103,6 @@ void user_exit(void)
 	local_irq_restore(flags);
 }
 
-#ifdef CONFIG_KVM
 void guest_enter(void)
 {
 	if (vtime_accounting_enabled())
@@ -111,6 +110,7 @@ void guest_enter(void)
 	else
 		__guest_enter();
 }
+EXPORT_SYMBOL_GPL(guest_enter);
 
 void guest_exit(void)
 {
@@ -119,8 +119,7 @@ void guest_exit(void)
 	else
 		__guest_exit();
 }
-#endif
-
+EXPORT_SYMBOL_GPL(guest_exit);
 
 /**
  * context_tracking_task_switch - context switch the syscall callbacks
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/