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SubjectRe: [PATCH v4 0/3] arm64: support page mapping percpu first chunk allocator
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Hi Greg and Andrew, as Catalin saids,the series touches drivers/ and mm/ 
but missing

acks from both of you,could you take a look of this patchset(patch1
change mm/vmalloc.c

and patch2 changes drivers/base/arch_numa.c).

And Catalin, is there any other comments? I hope this could be merged
into next version,

Many thanks all of you.

On 2021/9/10 13:33, Kefeng Wang wrote:
> 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@google.com> to patch v3
>
> 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 | 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(-)
>

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