> I think that there is a SMP race in the put_pio_request() and
> get_pio_request() in mm/filemap.c. The PIO list may get corrupted if
> several processors access it at once.
>
> May be someone might like to add a spinlock there (or tell me that there
> is no race because of <some smart explanation here>).
it's protected by the kernel lock [just watch how kpiod does an initial
lock_kernel()] ... or can you see any code path which uses
get_pio_request() without acquiring the kernel lock?
-- mingo
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