I've again a problem with the page fault handler I'm hijacking.
The error returned is:
Unable to handle kernel NULL pointer dereference at virtual address 00000000.
...............
<0>kernel panic: Aiee, killing interrupt handler
In interrupt handler - not syncing
I do the following operation.
I've a page fault handler function that calls a function to scan a list (of
type list_head) created by me.
There's another function that adds page addresses to the list.
When I call this function to fill the list, I've the problem with NULL
pointer.
I try to implement some spin_lock_irq.
The functions are like the following:
new_page_fault_handler(
{
......
scanlist();
.......
}
scanlist()
{
spin_lock_irqsave(...);
list_for_each(..)
.....
spin_unlock_irqrestore();
}
fill_list()
{
spin_lock_irqsave(...);
for all searched pages do{
make pages as not writable;
list_add(...);
}
spin_unlock_irqrestore();
}
I've to do some important statements.
1) I'm sure the hijacked page fault function works well. I've tested in other
situations.
2) Also the fill_list function works well.
So, I think there's a serious problem with the lock strategy I've implemented.
Can anyone tell me a different strategy? Is this really a locking problem?
Thanks.
Vincenzo Mallozzi.
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