linux-kernel - Re: [PATCH 3.8-rc4-nohz3] kvm: Add missing EXPORT_SYMBOL when CONFIG

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Date:	Wed, 23 Jan 2013 16:03:29 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	sedat.dilek@...il.com
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"devendra.aaru" <devendra.aaru@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3.8-rc4-nohz3] kvm: Add missing EXPORT_SYMBOL when CONFIG_KVM=m

2013/1/23 Sedat Dilek <sedat.dilek@...il.com>:
> On Wed, Jan 23, 2013 at 3:02 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
>> 2013/1/23 Steven Rostedt <rostedt@...dmis.org>:
>>> On Wed, 2013-01-23 at 14:46 +0100, Frederic Weisbecker wrote:
>>>
>>>> > Hmmm, yes, but why, clueless, CONFIG_KVM=y as a workaround!
>>>>
>>>> I believe he pointed out the "{i" to you. Typing mistake?
>>>
>>> In which case the CONFIG_KVM=y is a work around if that {i is within a
>>> #ifndef CONFIG_KVM ;-)
>>
>> No it's in #ifdef CONFIG_KVM so the right fix is:
>>
>> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
>> index bbb2c2c..a13b8a3 100644
>> --- a/kernel/context_tracking.c
>> +++ b/kernel/context_tracking.c
>> @@ -111,14 +111,19 @@ void guest_enter(void)
>>         else
>>                 __guest_enter();
>>  }
>> +EXPORT_SYMBOL_GPL(guest_enter);
>>
>>  void guest_exit(void)
>>  {
>> +#ifndef CONFIG_KVM
>> +i
>> +#endif
>>         if (vtime_accounting_enabled())
>>                 vtime_guest_exit(current);
>>         else
>>                 __guest_exit();
>>  }
>> +EXPORT_SYMBOL_GPL(guest_exit);
>>  #endif
>
> So, what's the real fix for this issue?

So CONFIG_SOMETHING doesn't work when it's a module. Hence we need to
remove the ifdef CONFIG_KVM around guest_enter(), guest_exit(),
vtime_guest_enter() and vtime_guest_exit(). Also it seems we need
<linux/export.h> in context_tracking.c
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