mm/hugetlb: add mmap() encodings for 32MB and 512MB page sizes

2018-10-05T23:32:04Z

ARM64 architecture also supports 32MB and 512MB HugeTLB page sizes. This just adds mmap() system call argument encoding for them. Link: http://lkml.kernel.org/r/1537841300-6979-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Acked-by: Punit Agrawal Acked-by: Mike Kravetz Cc: Michal Hocko Cc: Will Deacon Cc: Catalin Marinas Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman

mm: hugetlb: define system call hugetlb size encodings in single file

2017-09-07T00:27:28Z

Patch series "Consolidate system call hugetlb page size encodings". These patches are the result of discussions in https://lkml.org/lkml/2017/3/8/548. The following changes are made in the patch set: 1) Put all the log2 encoded huge page size definitions in a common header file. The idea is have a set of definitions that can be use as the basis for system call specific definitions such as MAP_HUGE_* and SHM_HUGE_*. 2) Remove MAP_HUGE_* definitions in arch specific files. All these definitions are the same. Consolidate all definitions in the primary user header file (uapi/linux/mman.h). 3) Remove SHM_HUGE_* definitions intended for user space from kernel header file, and add to user (uapi/linux/shm.h) header file. Add definitions for all known huge page size encodings as in mmap. This patch (of 3): If hugetlb pages are requested in mmap or shmget system calls, a huge page size other than default can be requested. This is accomplished by encoding the log2 of the huge page size in the upper bits of the flag argument. asm-generic and arch specific headers all define the same values for these encodings. Put common definitions in a single header file. The primary uapi header files for mmap and shm will use these definitions as a basis for definitions specific to those system calls. Link: http://lkml.kernel.org/r/1501527386-10736-2-git-send-email-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz Acked-by: Michal Hocko Cc: Matthew Wilcox Cc: Andi Kleen Cc: Michael Kerrisk Cc: Davidlohr Bueso Cc: Anshuman Khandual Cc: Aneesh Kumar K.V Cc: Andrea Arcangeli Cc: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

linux/include/uapi/asm-generic/hugetlb_encode.h, branch v4.20

mm/hugetlb: add mmap() encodings for 32MB and 512MB page sizes

mm: hugetlb: define system call hugetlb size encodings in single file