Solved:: Help:get_user_pages_remote - succeed on QEMU, Oops on Android 9 board

[Lev Olshvang <levonshe@xxxxxxxxxx>]

 

The problem was how I convert received page address to kernel address. I need to do it with kmap()

Now all works again

 

 

16.04.2019, 17:17, "Lev Olshvang" <levonshe@xxxxxxxxxx>:

Hello all,

 

I need to remap 1 page from user space to kernel and I use get_user_pages_remote for this purpose

 

ret = get_user_pages_remote(tsk, tsk->mm, offset, 1,

                                    0,

                                    &pinned_page, NULL);

 

Kernel is 4.9.88

I compiled module for Arm Vertex board  and run it under  QEMU  with no problem

But on Android 9  with this exactly kernel I got Oops:

Unable to handle kernel paging request at virtual address fe002000

pgd = d8c14000

[fe002000] *pgd=00000000

Internal error: Oops: 5 [#1] PREEMPT SMP ARM

 

I checked config files  and did not find any difference( almost except balloon ) in memory related configs.  

 

Does anybody have a clue what is a problem here?

 

Regards,

Lev

 

 

 

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