This series fixes sh and sparc that did not advertise their gigantic page
support and then were not able to allocate and free those pages at runtime.
It renames MEMORY_ISOLATION && COMPACTION || CMA condition into the more
accurate CONTIG_ALLOC, since it allows the definition of alloc_contig_range
function.
Finally, it then fixes the wrong definition of ARCH_HAS_GIGANTIC_PAGE config
that, without MEMORY_ISOLATION && COMPACTION || CMA defined, did not allow
architectures to free boottime allocated gigantic pages although unrelated.
Changes in v8:
This (hopefully last) version is rebased against v5.1-rc2 so that
it takes into account https://patchwork.ozlabs.org/patch/1047003/.
This version:
- factorizes gigantic_page_runtime_supported such as suggested
by Christophe.
- fix checkpath warning regarding the use of 'extern'
- fix s390 build that does not include asm-generic/hugetlb.h
And note that I did not add the reviewed-by and acked-by received in v6
since the patch differs a little.
Changes in v7:
I thought gigantic page support was settled at compile time, but Aneesh
and Michael have just come up with a patch proving me wrong for
powerpc: https://patchwork.ozlabs.org/patch/1047003/. So this version:
- reintroduces gigantic_page_supported renamed into
gigantic_page_runtime_supported
- reintroduces gigantic page page support corresponding checks (not
everywhere though: set_max_huge_pages check was redundant with
__nr_hugepages_store_common)
- introduces the possibility for arch to override this function
by using asm-generic/hugetlb.h current semantics although Aneesh
proposed something else.
Changes in v6:
- Remove unnecessary goto since the fallthrough path does the same and is
the 'normal' behaviour, as suggested by Dave Hensen
- Be more explicit in comment in set_max_huge_page: we return an error
if alloc_contig_range is not defined and the user tries to allocate a
gigantic page (we keep the same behaviour as before this patch), but we
now let her free boottime gigantic page, as suggested by Dave Hensen
- Add Acked-by, thanks.
Changes in v5:
- Fix bug in previous version thanks to Mike Kravetz
- Fix block comments that did not respect coding style thanks to Dave Hensen
- Define ARCH_HAS_GIGANTIC_PAGE only for sparc64 as advised by David Miller
- Factorize "def_bool" and "depends on" thanks to Vlastimil Babka
Changes in v4 as suggested by Dave Hensen:
- Split previous version into small patches
- Do not compile alloc_gigantic** functions for architectures that do not
support those pages
- Define correct ARCH_HAS_GIGANTIC_PAGE in all arch that support them to avoid
useless runtime check
- Add comment in set_max_huge_pages to explain that freeing is possible even
without CONTIG_ALLOC defined
- Remove gigantic_page_supported function across all archs
Changes in v3 as suggested by Vlastimil Babka and Dave Hansen:
- config definition was wrong and is now in mm/Kconfig
- COMPACTION_CORE was renamed in CONTIG_ALLOC
Changes in v2 as suggested by Vlastimil Babka:
- Get rid of ARCH_HAS_GIGANTIC_PAGE
- Get rid of architecture specific gigantic_page_supported
- Factorize CMA or (MEMORY_ISOLATION && COMPACTION) into COMPACTION_CORE
Alexandre Ghiti (4):
sh: Advertise gigantic page support
sparc: Advertise gigantic page support
mm: Simplify MEMORY_ISOLATION && COMPACTION || CMA into CONTIG_ALLOC
hugetlb: allow to free gigantic pages regardless of the configuration
arch/arm64/Kconfig | 2 +-
arch/arm64/include/asm/hugetlb.h | 4 --
arch/powerpc/include/asm/book3s/64/hugetlb.h | 5 +-
arch/powerpc/platforms/Kconfig.cputype | 2 +-
arch/s390/Kconfig | 2 +-
arch/s390/include/asm/hugetlb.h | 8 +--
arch/sh/Kconfig | 1 +
arch/sparc/Kconfig | 1 +
arch/x86/Kconfig | 2 +-
arch/x86/include/asm/hugetlb.h | 4 --
arch/x86/mm/hugetlbpage.c | 2 +-
include/asm-generic/hugetlb.h | 7 +++
include/linux/gfp.h | 4 +-
mm/Kconfig | 3 ++
mm/hugetlb.c | 54 ++++++++++++++------
mm/page_alloc.c | 7 ++-
16 files changed, 67 insertions(+), 41 deletions(-)
--
2.20.1
