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We are going to introduce <asm-generic/pgtable-nop4d.h> to provide abstraction for properly (in opposite to 5level-fixup.h hack) folded p4d level. The new header will be included from pgtable-nopud.h. If an architecture uses <asm-generic/nop*d.h>, we cannot use 5level-fixup.h directly to quickly convert the architecture to 5-level paging as it would conflict with pgtable-nop4d.h. With this patch an architecture can define __ARCH_USE_5LEVEL_HACK before inclusion <asm-genenric/nop*d.h> to use 5level-fixup.h. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.