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mm/hugetlb: align cma on allocation order, not demotion order

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Align the CMA area for hugetlb gigantic pages to their size, not the size
that they can be demoted to.  Otherwise there might be misaligned sections
at the start and end of the CMA area that will never be used for hugetlb
page allocations.

Link: https://lkml.kernel.org/r/20240430161437.2100295-1-fvdl@google.com
Fixes: a01f43901c ("hugetlb: be sure to free demoted CMA pages to CMA")
Signed-off-by: Frank van der Linden <fvdl@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Frank van der Linden 2024-04-30 16:14:37 +00:00 committed by Andrew Morton
parent 2acf04532d
commit cc48be374b
1 changed files with 1 additions and 1 deletions
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mm/hugetlb.c
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@ -7800,7 +7800,7 @@ void __init hugetlb_cma_reserve(int order)
* huge page demotion.
*/
res = cma_declare_contiguous_nid(0, size, 0,
PAGE_SIZE << HUGETLB_PAGE_ORDER,
PAGE_SIZE << order,
HUGETLB_PAGE_ORDER, false, name,
&hugetlb_cma[nid], nid);
if (res) {