On Tue, 2013-12-03 at 23:21 +0100, Andrea Arcangeli wrote:
> #ifdef CONFIG_PPC_FSL_BOOK3E
> hugepd_free(tlb, hugepte);
^^^^^^^^^^^^^^^^^^^^^^^^^^
This is the culprit
(Alex, you didn't specify this was embedded or did I miss it ?)
> #else
> pgtable_free_tlb(tlb, hugepte, pdshift - shift);
> #endif
> }
That function does:
batchp = &__get_cpu_var(hugepd_freelist_cur);
IE, it tries to use a per-CPU batch. Basically, it's duplicating the
logic in mm/memory.c for RCU freeing using a per-cpu freelist. I suppose
it assumes being called under something like the page table lock ?
This code also never "flushes" the batch, which is a concern...
Alex, this is Freescale stuff, can you followup with them ?
Cheers,
Ben.
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