[PATCH v2 0/2] mm: unify the allocation of pglist_data instances

[Miles Chen]

This patches is created to fix the __pa() warning messages when
CONFIG_DEBUG_VIRTUAL=y by unifying the allocation of pglist_data
instances.

In current implementation of node_data, if CONFIG_NEED_MULTIPLE_NODES=y,
pglist_data is allocated by a memblock API. If CONFIG_NEED_MULTIPLE_NODES=n,
we use a global variable named "contig_page_data".

If CONFIG_DEBUG_VIRTUAL is not enabled. __pa() can handle both
allocation and symbol cases. But if CONFIG_DEBUG_VIRTUAL is set,
we will have the "virt_to_phys used for non-linear address" warning
when booting.

To fix the warning, always allocate pglist_data by memblock APIs and
remove the usage of contig_page_data.

Warning message:
[    0.000000] ------------[ cut here ]------------
[    0.000000] virt_to_phys used for non-linear address: (____ptrval____) (contig_page_data+0x0/0x1c00)
[    0.000000] WARNING: CPU: 0 PID: 0 at arch/arm64/mm/physaddr.c:15 __virt_to_phys+0x58/0x68
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Tainted: G        W         5.13.0-rc1-00074-g1140ab592e2e #3
[    0.000000] Hardware name: linux,dummy-virt (DT)
[    0.000000] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO BTYPE=--)
[    0.000000] pc : __virt_to_phys+0x58/0x68
[    0.000000] lr : __virt_to_phys+0x54/0x68
[    0.000000] sp : ffff800011833e70
[    0.000000] x29: ffff800011833e70 x28: 00000000418a0018 x27: 0000000000000000
[    0.000000] x26: 000000000000000a x25: ffff800011b70000 x24: ffff800011b70000
[    0.000000] x23: fffffc0001c00000 x22: ffff800011b70000 x21: 0000000047ffffb0
[    0.000000] x20: 0000000000000008 x19: ffff800011b082c0 x18: ffffffffffffffff
[    0.000000] x17: 0000000000000000 x16: ffff800011833bf9 x15: 0000000000000004
[    0.000000] x14: 0000000000000fff x13: ffff80001186a548 x12: 0000000000000000
[    0.000000] x11: 0000000000000000 x10: 00000000ffffffff x9 : 0000000000000000
[    0.000000] x8 : ffff8000115c9000 x7 : 737520737968705f x6 : ffff800011b62ef8
[    0.000000] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
[    0.000000] x2 : 0000000000000000 x1 : ffff80001159585e x0 : 0000000000000058
[    0.000000] Call trace:
[    0.000000]  __virt_to_phys+0x58/0x68
[    0.000000]  check_usemap_section_nr+0x50/0xfc
[    0.000000]  sparse_init_nid+0x1ac/0x28c
[    0.000000]  sparse_init+0x1c4/0x1e0
[    0.000000]  bootmem_init+0x60/0x90
[    0.000000]  setup_arch+0x184/0x1f0
[    0.000000]  start_kernel+0x78/0x488
[    0.000000] ---[ end trace f68728a0d3053b60 ]---

[1] https://lore.kernel.org/patchwork/patch/1425110/

Change since v1:
- use memblock_alloc() to create pglist_data when CONFIG_NUMA=n

Miles Chen (2):
  mm: introduce prepare_node_data
  mm: replace contig_page_data with node_data

 Documentation/admin-guide/kdump/vmcoreinfo.rst | 13 -------------
 arch/powerpc/kexec/core.c                      |  5 -----
 include/linux/gfp.h                            |  3 ---
 include/linux/mm.h                             |  2 ++
 include/linux/mmzone.h                         |  4 ++--
 kernel/crash_core.c                            |  1 -
 mm/memblock.c                                  |  3 +--
 mm/page_alloc.c                                | 16 ++++++++++++++++
 mm/sparse.c                                    |  2 ++
 9 files changed, 23 insertions(+), 26 deletions(-)


base-commit: 8ac91e6c6033ebc12c5c1e4aa171b81a662bd70f
-- 
2.18.0