Re: patching kdb to Centos kernel : error

On 8/18/08, jidong xiao <[email protected]> wrote:
> On Mon, Aug 18, 2008 at 3:24 AM, Satish Eerpini <[email protected]> wrote:
>> hi everyone , i was trying to patch kdb with CentOS 5.0 kernel
>> (2.6.18-8) , and had a few rejects ( which i am still trying to
>> resolve) ,.... but apart from the rejects during the kernel
>> compilation i got the following error which does not seem to have
>> anything to do with the rejects ............
>> i have got an error in a kdb module, which has nothing to do with the
>> rejected patches ( or so i guess ) :
>>
>>            kdb/modules/kdbm_pg.c: In function 'kdbm_show_page':
>>            kdb/modules/kdbm_pg.c:349: error: implicit declaration
>> of function 'PageChecked'
>>            kdb/modules/kdbm_pg.c: In function 'kdbm_inode':
>>            kdb/modules/kdbm_pg.c:507: error: 'struct inode' has no
>> member named 'u'
>>
>>  the code(in kdb/modules/kdbm_pg.c) which is causing the second error
>> is something like this :
>>
>>           iaddr += offsetof(struct inode, u);
>>
>> what i am not able to understand is that if 'u' is not a correct
>> member of the inode , .. then what did they( whoever wrote this piece
>> code) intend by 'u' ? , .....
>>
>> ....
>> and for the first error , ... i just checked out the code ....
>> according to the line no shown in the error .....the code is :
>>
>>           kdb_page_flags(page, Checked);
>>
>> and i don't see any function PageChecked ....! so what can the error
>> actually mean ??
>>
>> Thanks in advance
>> Satish
>>
>> --
> Well I think people usually don't use KDB modules, so you can simply
> disable KDB modules by setting CONFIG_KDB_MODULES=n. This can avoid
> the two errors you mentioned.
>
> Regarding your second error, you can replace "u" with "i_private".
>
>  iaddr += offsetof(struct inode, i_private);
>
> As to the first error, you can refer to the definition of
> kdb_page_flags, which explains your question.
>
> #define kdb_page_flags(page, type) if (Page ## type(page))
> kdb_printf(" " #type);
>
>
> Regards
> Jason
>

hi jason ,

i have fixed those errors , .... i changed the u to i_private in the
second error and then completely commented out the following line from
the kdbm_pg.c file :
	kdb_page_flags(page, Checked); // on line 349
this solved the first error about the implicit function declaration ,
... after this the compilation went on fine , .... but at the stage
where the vmlinux file is linked i have some gcc specific errors ( or
so it seems from what i have got on google searches ) , ........ here
is a short part of the errors :

  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  CHK     include/linux/compile.h
  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
kernel/built-in.o: In function `timespec_add_ns':
/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i386/include/linux/time.h:175:
undefined reference to `__umoddi3'
kernel/built-in.o: In function `do_gettimeofday':
/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i386/kernel/timer.c:865:
undefined reference to `__udivdi3'
/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i386/kernel/timer.c:866:
undefined reference to `__umoddi3'
kernel/built-in.o: In function `timespec_add_ns':
/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i386/include/linux/time.h:170:
undefined reference to `__udivdi3'
/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i386/include/linux/time.h:175:
undefined reference to `__umoddi3'
^Cmake: *** Deleting file `.tmp_vmlinux1'
make: *** [.tmp_vmlinux1] Interrupt

can u make anything out of it ? , ... i checked both time.h and
timer.c , something appears to be fussy in struct timesoec , but i am
not proficient enough to see what it is ?

Thanks
Satish

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