linux-toradex.git/include/linux/hugetlb.h, branch v4.12

mm: convert generic code to 5-level paging

2017-03-09T19:48:47+00:00

Convert all non-architecture-specific code to 5-level paging.

It's mostly mechanical adding handling one more page table level in
places where we deal with pud_t.

Signed-off-by: Kirill A. Shutemov 
Acked-by: Michal Hocko 
Signed-off-by: Linus Torvalds

userfaultfd: hugetlbfs: gup: support VM_FAULT_RETRY

2017-02-23T00:41:28+00:00

Add support for VM_FAULT_RETRY to follow_hugetlb_page() so that
get_user_pages_unlocked/locked and "nonblocking/FOLL_NOWAIT" features
will work on hugetlbfs.

This is required for fully functional userfaultfd non-present support on
hugetlbfs.

Link: http://lkml.kernel.org/r/20161216144821.5183-25-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli 
Reviewed-by: Mike Kravetz 
Cc: "Dr. David Alan Gilbert" 
Cc: Hillf Danton 
Cc: Michael Rapoport 
Cc: Mike Rapoport 
Cc: Pavel Emelyanov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

userfaultfd: hugetlbfs: add hugetlb_mcopy_atomic_pte for userfaultfd support

2017-02-23T00:41:28+00:00

hugetlb_mcopy_atomic_pte is the low level routine that implements the
userfaultfd UFFDIO_COPY command.  It is based on the existing
mcopy_atomic_pte routine with modifications for huge pages.

Link: http://lkml.kernel.org/r/20161216144821.5183-18-aarcange@redhat.com
Signed-off-by: Mike Kravetz 
Signed-off-by: Andrea Arcangeli 
Cc: "Dr. David Alan Gilbert" 
Cc: Hillf Danton 
Cc: Michael Rapoport 
Cc: Mike Rapoport 
Cc: Pavel Emelyanov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: remove unnecessary condition in remove_inode_hugepages

2016-10-08T01:46:29+00:00

When the huge page is added to the page cahce (huge_add_to_page_cache),
the page private flag will be cleared.  since this code
(remove_inode_hugepages) will only be called for pages in the page
cahce, PagePrivate(page) will always be false.

The patch remove the code without any functional change.

Link: http://lkml.kernel.org/r/1475113323-29368-1-git-send-email-zhongjiang@huawei.com
Signed-off-by: zhong jiang 
Reviewed-by: Naoya Horiguchi 
Reviewed-by: Mike Kravetz 
Tested-by: Mike Kravetz 
Acked-by: Michal Hocko 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/hugetlb: check for reserved hugepages during memory offline

2016-10-08T01:46:29+00:00

In dissolve_free_huge_pages(), free hugepages will be dissolved without
making sure that there are enough of them left to satisfy hugepage
reservations.

Fix this by adding a return value to dissolve_free_huge_pages() and
checking h->free_huge_pages vs.  h->resv_huge_pages.  Note that this may
lead to the situation where dissolve_free_huge_page() returns an error
and all free hugepages that were dissolved before that error are lost,
while the memory block still cannot be set offline.

Fixes: c8721bbb ("mm: memory-hotplug: enable memory hotplug to handle hugepage")
Link: http://lkml.kernel.org/r/20160926172811.94033-3-gerald.schaefer@de.ibm.com
Signed-off-by: Gerald Schaefer 
Acked-by: Michal Hocko 
Acked-by: Naoya Horiguchi 
Cc: "Kirill A . Shutemov" 
Cc: Vlastimil Babka 
Cc: Mike Kravetz 
Cc: "Aneesh Kumar K . V" 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Rui Teng 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

include/linux/hugetlb.h: use bool instead of int for hugepage_migration_supported()

2016-05-21T00:58:30+00:00

It is used as a pure bool function within kernel source wide.

Signed-off-by: Chen Gang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

include/linux/hugetlb*.h: clean up code

2016-05-21T00:58:30+00:00

Macro HUGETLBFS_SB is clear enough, so one statement is clearer than 3
lines statements.

Remove redundant return statements for non-return functions, which can
save lines, at least.

Signed-off-by: Chen Gang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/hugetlb: introduce hugetlb_bad_size()

2016-05-20T02:12:14+00:00

When any unsupported hugepage size is specified, 'hugepagesz=' and
'hugepages=' should be ignored during command line parsing until any
supported hugepage size is found.  But currently incorrect number of
hugepages are allocated when unsupported size is specified as it fails
to ignore the 'hugepages=' command.

Test case:

Note that this is specific to x86 architecture.

Boot the kernel with command line option 'hugepagesz=256M hugepages=X'.
After boot, dmesg output shows that X number of hugepages of the size 2M
is pre-allocated instead of 0.

So, to handle such command line options, introduce new routine
hugetlb_bad_size.  The routine hugetlb_bad_size sets the global variable
parsed_valid_hugepagesz.  We are using parsed_valid_hugepagesz to save
the state when unsupported hugepagesize is found so that we can ignore
the 'hugepages=' parameters after that and then reset the variable when
supported hugepage size is found.

The routine hugetlb_bad_size can be called while setting 'hugepagesz='
parameter in an architecture specific code.

Signed-off-by: Vaishali Thakkar 
Reviewed-by: Mike Kravetz 
Reviewed-by: Naoya Horiguchi 
Acked-by: Michal Hocko 
Cc: Hillf Danton 
Cc: Yaowei Bai 
Cc: Dominik Dingel 
Cc: Kirill A. Shutemov 
Cc: Paul Gortmaker 
Cc: Dave Hansen 
Cc: Benjamin Herrenschmidt 
Cc: James Hogan 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

hugetlb: fix compile error on tile

2016-01-16T01:56:32+00:00

Inlude asm/pgtable.h to get the definition for pud_t to fix:

  include/linux/hugetlb.h:203:29: error: unknown type name 'pud_t'

Signed-off-by: Dan Williams 
Cc: Liviu Dudau 
Cc: Sudeep Holla 
Cc: Lorenzo Pieralisi 
Cc: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

include/linux/hugetlb.h: is_file_hugepages() can be boolean

2016-01-15T00:00:49+00:00

Make is_file_hugepages() return bool to improve readability due to this
particular function only using either one or zero as its return value.

This patch also removed the if condition to make is_file_hugepages
return directly.

No functional change.

Signed-off-by: Yaowei Bai 
Acked-by: Michal Hocko 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds