[PATCH v4 0/3] arm64: support page mapping percpu first chunk allocator

[Kefeng Wang]

Percpu embedded first chunk allocator is the firstly option, but it
could fails on ARM64, eg,
  "percpu: max_distance=0x5fcfdc640000 too large for vmalloc space 0x781fefff0000"
  "percpu: max_distance=0x600000540000 too large for vmalloc space 0x7dffb7ff0000"
  "percpu: max_distance=0x5fff9adb0000 too large for vmalloc space 0x5dffb7ff0000"

then we could meet "WARNING: CPU: 15 PID: 461 at vmalloc.c:3087 pcpu_get_vm_areas+0x488/0x838",
even the system could not boot successfully.

Let's implement page mapping percpu first chunk allocator as a fallback
to the embedding allocator to increase the robustness of the system.

Also fix a crash when both NEED_PER_CPU_PAGE_FIRST_CHUNK and KASAN_VMALLOC enabled.

Tested on ARM64 qemu with cmdline "percpu_alloc=page" based on v5.14.

V4:
- add ACK/RB
- address comments about patch1 from Catalin
- add Greg and Andrew into list suggested by Catalin

v3:
- search for a range that fits instead of always picking the end from
  vmalloc area suggested by Catalin.
- use NUMA_NO_NODE to avoid "virt_to_phys used for non-linear address:"
  issue in arm64 kasan_populate_early_vm_area_shadow().
- add Acked-by: Marco Elver <elver@xxxxxxxxxx> to patch v3

V2:
- fix build error when CONFIG_KASAN disabled, found by lkp@xxxxxxxxx
- drop wrong __weak comment from kasan_populate_early_vm_area_shadow(),
  found by Marco Elver <elver@xxxxxxxxxx>

Kefeng Wang (3):
  vmalloc: Choose a better start address in vm_area_register_early()
  arm64: Support page mapping percpu first chunk allocator
  kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC

 arch/arm64/Kconfig         |  4 ++
 arch/arm64/mm/kasan_init.c | 16 ++++++++
 drivers/base/arch_numa.c   | 82 +++++++++++++++++++++++++++++++++-----
 include/linux/kasan.h      |  6 +++
 mm/kasan/init.c            |  5 +++
 mm/vmalloc.c               | 19 ++++++---
 6 files changed, 116 insertions(+), 16 deletions(-)

-- 
2.26.2