powerpc/mm: Fix kernel crash on page table free

[Michael Ellerman]

On Wed, 2018-05-30 at 12:32:25 UTC, "Aneesh Kumar K.V" wrote:
> Fix the below crash on BookE 64. pgtable_page_dtor expects struct page *arg.
> 
> Also call the destructor on non book3s platforms correctly. This free up the
> split ptl locks correctly if we had allocated them before.
> 
> Call Trace:
> [c0000000f30c7520] [c00000000021eeec] .kmem_cache_free+0x9c/0x44c (unreliable)
> [c0000000f30c75c0] [c0000000001ee07c] .ptlock_free+0x1c/0x30
> [c0000000f30c7630] [c0000000001ee260] .tlb_remove_table+0xdc/0x224
> [c0000000f30c76c0] [c0000000001ee640] .free_pgd_range+0x298/0x500
> [c0000000f30c77d0] [c000000000232afc] .shift_arg_pages+0x10c/0x1e0
> [c0000000f30c7910] [c000000000232dd0] .setup_arg_pages+0x200/0x25c
> [c0000000f30c79c0] [c0000000002ad4fc] .load_elf_binary+0x450/0x16c8
> [c0000000f30c7b10] [c000000000234914] .search_binary_handler.part.11+0x9c/0x248
> [c0000000f30c7bb0] [c00000000023595c] .do_execveat_common.isra.13+0x868/0xc18
> [c0000000f30c7cb0] [c00000000000184c] .run_init_process+0x34/0x4c
> [c0000000f30c7d30] [c000000000001880] .try_to_run_init_process+0x1c/0x68
> [c0000000f30c7db0] [c000000000002bd8] .kernel_init+0xdc/0x130
> [c0000000f30c7e30] [c0000000000009dc] .ret_from_kernel_thread+0x58/0x7c
> 
> Fixes: 702346768 ("powerpc/mm/nohash: Remove pte fragment dependency from nohash")
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/667416f38554eef94485496f3a27b9

cheers