On 05/21/2013 06:59 PM, Russell King - ARM Linux wrote:
> On Tue, May 21, 2013 at 09:51:57AM +0800, Chen Gang wrote:
>> On 05/21/2013 12:31 AM, Russell King - ARM Linux wrote:
>>> On Mon, May 20, 2013 at 07:40:24AM -0700, Eric W. Biederman wrote:
>>>> Seriously? The correct fix it would seem is to give a useful default BUG
>>>> definition. Say *NULL.
>>>
>>> Absolutely.
>>>
>>> The real question is... how is this happening. I've seen it occasionally
>>> in the randconfig builds - though I don't have any logs to hand which
>>> show that in the build system at the moment. So, looking at the files:
>>>
>>
>> Maybe it is my fault for the incorrect configuration.
>>
>> My operation:
>> make EXTRA_CFLAGS=-W ARCH=arm randconfig
>> make EXTRA_CFLAGS=-W ARCH=arm menuconfig
>> set 'arm-linux-gnu-' as cross compiler prefix.
>> select "MMU-based Paged Memory" in "System Type".
>> select "Samsung S5PV210/S5PC110" in "ARM System type"
>> make EXTRA_CFLAGS=-W ARCH=arm
>> ...
>>
>> In menuconfig, I do not touch the "S5PV210 Machines" or "S5PC110
>> Machines" in "System Type", and no machines will be chosen as default.
>
> You know, telling us that you're using a random configuration to produce
> a problem and not providing the actual configuration file is utterly
> insane. How many iterations do you think it might take to generate a
> random configuration which shows the same problem you're seeing?
>
>
Oh, it is my fault for my original reply (it is another issue which
also need further discussed)
But for current issue, we can repeat it only in menuconfig, unset " >
General setup > Configure standard kernel features (expert users) >
BUG() Support ", it will report related warnings.
For arm architecture, allmodconfig
make ARCH=arm allmodconfig
make ARCH=arm menuconfig
set "arm-linux-gnu-" as cross compiler prefix.
unset " > General setup > Configure standard kernel features (expert users)
> BUG() Support "
make ARCH=arm
...
kernel/sched/core.c:2353:1: warning: control reaches end of non-void function
[-Wreturn-type]
mm/bootmem.c:386:1: warning: control reaches end of non-void function
[-Wreturn-type]
include/linux/posix_acl.h:108:1: warning: control reaches end of non-void
function [-Wreturn-type]
...
For x86 architecture, allmodconfig:
make allmodconfig
make menuconfig
unset " > General setup > Configure standard kernel features (expert users)
> BUG() Support "
make ARCH=arm
...
arch/x86/kvm/x86.c:4298:5: warning: ‘exchanged’ may be used uninitialized in
this function [-Wuninitialized]
kernel/sched/core.c:2353:1: warning: control reaches end of non-void function
[-Wreturn-type]
mm/mempolicy.c:1755:1: warning: control reaches end of non-void function
[-Wreturn-type]
include/linux/posix_acl.h:108:1: warning: control reaches end of non-void
function [-Wreturn-type]
...
So, we need fix the generic bug.h code, it is not arm specific.
Thanks.--
Chen Gang
Asianux Corporation
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