Add a generic VMA lock-based page fault handler in mm core, and convert architectures to use it, which eliminate architectures's duplicated codes. With it, we can avoid multiple changes in architectures's code if we add new feature or bugfix, in the end, enable this feature on ARM32 and Loongarch. This is based on next-20230817, only built test. v2: - convert "int arch_vma_check_access()" to "bool arch_vma_access_error()" still use __weak function for arch_vma_access_error(), which avoid to declare access_error() in architecture's(x86/powerpc/riscv/loongarch) headfile. - re-use struct vm_fault instead of adding new struct vm_locked_fault, per Matthew Wilcox, add necessary pt_regs/fault error code/vm flags into vm_fault since they could be used in arch_vma_access_error() - add special VM_FAULT_NONE and make try_vma_locked_page_fault() to return vm_fault_t Kefeng Wang (10): mm: add a generic VMA lock-based page fault handler arm64: mm: use try_vma_locked_page_fault() x86: mm: use try_vma_locked_page_fault() s390: mm: use try_vma_locked_page_fault() powerpc: mm: use try_vma_locked_page_fault() riscv: mm: use try_vma_locked_page_fault() ARM: mm: try VMA lock-based page fault handling first loongarch: mm: cleanup __do_page_fault() loongarch: mm: add access_error() helper loongarch: mm: try VMA lock-based page fault handling first arch/arm/Kconfig | 1 + arch/arm/mm/fault.c | 35 ++++++++---- arch/arm64/mm/fault.c | 60 ++++++++------------- arch/loongarch/Kconfig | 1 + arch/loongarch/mm/fault.c | 111 ++++++++++++++++++++++---------------- arch/powerpc/mm/fault.c | 66 +++++++++++------------ arch/riscv/mm/fault.c | 58 +++++++++----------- arch/s390/mm/fault.c | 66 ++++++++++------------- arch/x86/mm/fault.c | 55 ++++++++----------- include/linux/mm.h | 17 ++++++ include/linux/mm_types.h | 2 + mm/memory.c | 39 ++++++++++++++ 12 files changed, 278 insertions(+), 233 deletions(-) -- 2.27.0
