The function that is invoking the segmentation fault
is
pte_offset_map(my_pmd, page). It is strange because
this works for kernel 2.6.1 but it does not work for
2.6.9.
Could anyone help me?
Mauricio Lin.
--- Mauricio Lin <mauriciolin2000@xxxxxxxxxxxx>
escreveu:
> I figured out where is the problem.
>
> It is a function I implemented for kernel 2.6.1, but
> does not work for 2.6.9. The function below throws
> the
> segmentation fault.
>
> Here is the function:
>
> void resident_mem_size(struct mm_struct *mm,
> unsigned
> long start_address, unsigned long end_address,
> unsigned long *size) {
> pgd_t *my_pgd;
> pmd_t *my_pmd;
> pte_t *my_pte;
> unsigned long page;
>
> for (page = start_address; page < end_address; page
> += PAGE_SIZE) {
> my_pgd = pgd_offset(mm, page);
> if (pgd_none(*my_pgd) || pgd_bad(*my_pgd))
> continue;
> my_pmd = pmd_offset(my_pgd, page);
> if (pmd_none(*my_pmd) || pmd_bad(*my_pmd))
> continue;
> my_pte = pte_offset_map(my_pmd, page);
> if (pte_present(*my_pte)) {
> *size += PAGE_SIZE;
> }
> }
> }
>
> Does anyone know what is going on?
>
> Mauricio Lin.
>
> --- Mauricio Lin <mauriciolin2000@xxxxxxxxxxxx>
> escreveu:
> > Hi All,
> >
> > I have implemented a new entry in proc directory
> in
> > kernel 2.6.1. It is something similar to
> > /proc/pid/maps. The new entry is /proc/pid/smaps
> > where
> > pid is the process id. It is working well on
> kernel
> > 2.6.1.
> >
> > I decided to upgrade it to kernel 2.6.9, but
> > something
> > is going wrong when I type de cat command.
> >
> > $ cat /proc/3477/smaps
> >
> > b68ed000-b68ee000 rw-p
> /usr/lib/kde3/kded_kinetd.so
> > VmRss: 4 kB
> > VmData: 0 KB
> > VmStk: 0 kB
> > VmExe: 0 kB
> > VmLib: 0 kB
> > Shared: 0 kB
> > Private: 4 kB
> > Shareable: 0 kB
> > b68ee000-b68ff000 r--p
> >
>
/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf
> > VmRss: 68 kB
> > VmData: 0 KB
> > VmStk: 0 kB
> > VmExe: 0 kB
> > VmLib: 0 kB
> > Shared: 0 kB
> > Private: 68 kB
> > Shareable: 0 kB
> >
> > ....
> >
> > b7fea000-b8000000 r-xp /lib/ld-2.3.2.so
> > VmRss: 80 kB
> > VmData: 0 KB
> > VmStk: 0 kB
> > VmExe: Segmentation fault
> >
> > As you can see, the segmentation fault is
> displayed
> > at
> > the end of the output. This problem does not have
> > for
> > kernel 2.6.1.
> >
> > The files I changed are fs/proc/base.c and
> > fs/proc/task_mmu.c on kernel 2.6.1. AFAIK this
> files
> > were not changed since 2.6.1. So what is going on
> > with
> > kernel 2.6.9?
> >
> > BR,
> >
> > Mauricio Lin.
> >
> > =====
> > ************************************************
> > Conhecimento vem do seu instrutor;
> > Sabedoria vem do seu interior.
> > (Bruce Lee)
> > ************************************************
> >
> >
> >
> >
> >
> >
>
_______________________________________________________
> >
> > Yahoo! Acesso Grátis - Internet rápida e grátis.
> > Instale o discador agora!
> > http://br.acesso.yahoo.com/
> >
> > --
> > Kernelnewbies: Help each other learn about the
> Linux
> > kernel.
> > Archive:
> > http://mail.nl.linux.org/kernelnewbies/
> > FAQ: http://kernelnewbies.org/faq/
> >
> >
>
> =====
> ************************************************
> Conhecimento vem do seu instrutor;
> Sabedoria vem do seu interior.
> (Bruce Lee)
> ************************************************
>
>
>
>
>
>
_______________________________________________________
>
> Yahoo! Acesso Grátis - Internet rápida e grátis.
> Instale o discador agora!
> http://br.acesso.yahoo.com/
>
> --
> Kernelnewbies: Help each other learn about the Linux
> kernel.
> Archive:
> http://mail.nl.linux.org/kernelnewbies/
> FAQ: http://kernelnewbies.org/faq/
>
>
=====
************************************************
Conhecimento vem do seu instrutor;
Sabedoria vem do seu interior.
(Bruce Lee)
************************************************
_______________________________________________________
Yahoo! Acesso Grátis - Internet rápida e grátis. Instale o discador agora! http://br.acesso.yahoo.com/
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
