[PATCH v3] powerpc/mm: Remove DEBUG_VM_PGTABLE support on powerpc

[Michael Ellerman]

On Wed, 2 Sep 2020 09:31:22 +0530, Aneesh Kumar K.V wrote:
> The test is broken w.r.t page table update rules and results in kernel
> crash as below. Disable the support until we get the tests updated.
> 
> [   21.083519] kernel BUG at arch/powerpc/mm/pgtable.c:304!
> cpu 0x0: Vector: 700 (Program Check) at [c000000c6d1e76c0]
>     pc: c00000000009a5ec: assert_pte_locked+0x14c/0x380
>     lr: c0000000005eeeec: pte_update+0x11c/0x190
>     sp: c000000c6d1e7950
>    msr: 8000000002029033
>   current = 0xc000000c6d172c80
>   paca    = 0xc000000003ba0000   irqmask: 0x03   irq_happened: 0x01
>     pid   = 1, comm = swapper/0
> kernel BUG at arch/powerpc/mm/pgtable.c:304!
> [link register   ] c0000000005eeeec pte_update+0x11c/0x190
> [c000000c6d1e7950] 0000000000000001 (unreliable)
> [c000000c6d1e79b0] c0000000005eee14 pte_update+0x44/0x190
> [c000000c6d1e7a10] c000000001a2ca9c pte_advanced_tests+0x160/0x3d8
> [c000000c6d1e7ab0] c000000001a2d4fc debug_vm_pgtable+0x7e8/0x1338
> [c000000c6d1e7ba0] c0000000000116ec do_one_initcall+0xac/0x5f0
> [c000000c6d1e7c80] c0000000019e4fac kernel_init_freeable+0x4dc/0x5a4
> [c000000c6d1e7db0] c000000000012474 kernel_init+0x24/0x160
> [c000000c6d1e7e20] c00000000000cbd0 ret_from_kernel_thread+0x5c/0x6c
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/mm: Remove DEBUG_VM_PGTABLE support on powerpc
      https://git.kernel.org/powerpc/c/675bceb097e6fb9769309093ec6f3d33a2fed9cc

cheers