lkml.org 
[lkml]   [2021]   [Jul]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator
Date
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

\
 
 \ /
  Last update: 2021-07-20 04:52    [W:0.109 / U:0.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site