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* [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator
@ 2021-07-20  2:51 ` Kefeng Wang
  0 siblings, 0 replies; 26+ messages in thread
From: Kefeng Wang @ 2021-07-20  2:51 UTC (permalink / raw)
  To: Catalin Marinas, Will Deacon, Andrey Ryabinin, Andrey Konovalov,
	Dmitry Vyukov
  Cc: linux-arm-kernel, linux-kernel, kasan-dev, linux-mm, 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-rc2.

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

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 | 17 ++++++++
 drivers/base/arch_numa.c   | 82 +++++++++++++++++++++++++++++++++-----
 include/linux/kasan.h      |  6 +++
 mm/kasan/init.c            |  5 +++
 mm/vmalloc.c               |  9 +++--
 6 files changed, 110 insertions(+), 13 deletions(-)

-- 
2.26.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

end of thread, other threads:[~2021-08-05 12:48 UTC | newest]

Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-20  2:51 [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang
2021-07-20  2:51 ` Kefeng Wang
2021-07-20  2:51 ` [PATCH v2 1/3] vmalloc: Choose a better start address in vm_area_register_early() Kefeng Wang
2021-07-20  2:51   ` Kefeng Wang
2021-08-01 15:23   ` Catalin Marinas
2021-08-01 15:23     ` Catalin Marinas
2021-08-02  2:39     ` Kefeng Wang
2021-08-02  2:39       ` Kefeng Wang
2021-08-04 11:14       ` Catalin Marinas
2021-08-04 11:14         ` Catalin Marinas
2021-08-05 12:46         ` Kefeng Wang
2021-08-05 12:46           ` Kefeng Wang
2021-07-20  2:51 ` [PATCH v2 2/3] arm64: Support page mapping percpu first chunk allocator Kefeng Wang
2021-07-20  2:51   ` Kefeng Wang
2021-08-01 15:53   ` Catalin Marinas
2021-08-01 15:53     ` Catalin Marinas
2021-08-02  2:47     ` Kefeng Wang
2021-08-02  2:47       ` Kefeng Wang
2021-07-20  2:51 ` [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC Kefeng Wang
2021-07-20  2:51   ` Kefeng Wang
2021-07-22 11:00   ` Marco Elver
2021-07-22 11:00     ` Marco Elver
2021-07-22 12:14     ` Kefeng Wang
2021-07-22 12:14       ` Kefeng Wang
2021-07-26  1:19 ` [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang
2021-07-26  1:19   ` Kefeng Wang

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