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commit9b31cf493f("arm64: mm: Introduce MAX_USER_VA_BITS definition") introduced the MAX_USER_VA_BITS definition, which was used to support the arm64 mm use-cases where the user-space could use 52-bit virtual addresses whereas the kernel-space would still could a maximum of 48-bit virtual addressing. But, now with commitb6d00d47e8("arm64: mm: Introduce 52-bit Kernel VAs"), we removed the 52-bit user/48-bit kernel kconfig option and hence there is no longer any scenario where user VA != kernel VA size (even with CONFIG_ARM64_FORCE_52BIT enabled, the same is true). Hence we can do away with the MAX_USER_VA_BITS macro as it is equal to VA_BITS (maximum VA space size) in all possible use-cases. Note that even though the 'vabits_actual' value would be 48 for arm64 hardware which don't support LVA-8.2 extension (even when CONFIG_ARM64_VA_BITS_52 is enabled), VA_BITS would still be set to a value 52. Hence this change would be safe in all possible VA address space combinations. Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Steve Capper <steve.capper@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: linux-kernel@vger.kernel.org Cc: kexec@lists.infradead.org Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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.