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

Kefeng Wang
2021-07-05T11:07:33Z

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",
the system can't 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 next-20210630.

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 | 18 +++++++++
drivers/base/arch_numa.c | 82 +++++++++++++++++++++++++++++++++-----
include/linux/kasan.h | 2 +
mm/kasan/init.c | 5 +++
mm/vmalloc.c | 9 +++--
6 files changed, 107 insertions(+), 13 deletions(-)

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2.26.2