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When reading the arm64's PER_VMA_LOCK support code, I found a bit difference between arm64 and other arch when calling handle_mm_fault() during VMA lock-based page fault handling: the fault address is masked before passing to handle_mm_fault(). This is also different from the usage in mmap_lock-based handling. I think we need to pass the original fault address to handle_mm_fault() as we did in commit84c5e23ede("arm64: mm: Pass original fault address to handle_mm_fault()"). If we go through the code path further, we can find that the "masked" fault address can cause mismatched fault address between perf sw major/minor page fault sw event and perf page fault sw event: do_page_fault perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, ..., addr) // orig addr handle_mm_fault mm_account_fault perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, ...) // masked addr Fixes:cd7f176aea("arm64/mm: try VMA lock-based page fault handling first") Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20230524131305.2808-1-jszhang@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.