Re: How to avoid kernel Oops 0x81F in function do_alignment() ?
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hi subin: Thanks,I have solved this issue, the Method looks the same as you mentioned. 在 2012-3-14，11:12，"subin gangadharan" <subingangadharan@xxxxxxxxx> 写道： > Hi, > > >> 2. how can i change the page permisson before write back instruction of >> user mode application? >> for example, find out the page tables of current application, find out >> the pte which represents >> the instruction that generate data abort, then modify pte, write back >> instruction, restore pte, done. >> how to do these? > > I think you can get the pgd of this process by current->mm->pgd and > pgd_offset macro to ge the pgd entry for that address. There are > macros available for accessing pmd and pte too. For example > pte_offset_map for pte and a locking version for the same is also > there. I don't have any hands on experience on this, so our kernel > experts can comment on this more. > > And one more thing, if you can look at the function handle_mm_fault > (mm/memory.c), there are plenty of refererces for accesing these page > table entries. > > With Regards, > Subin K G > > > >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > > > -- > With Regards > Subin Gangadharan > > I am not afraid and I am also not afraid of being afraid. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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