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01abdfeac8
Make TASK_SIZE from const to dynamic detect TIF_32BIT flag function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for efi-stub. Limit 32-bit compatible process in 0-2GB virtual address range (which is enough for real scenarios), because it could avoid address sign extend problem when 32-bit enter 64-bit and ease software design. The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and compared to a compatible 32-bit, it increases 476MB for the application's virtual address. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Heiko Stuebner <heiko@sntech.de> Link: https://lore.kernel.org/r/20220405071314.3225832-11-guoren@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.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.