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 8hHYRX57 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based on that. > > Signed-off-by: David Hildenbrand > --- > include/linux/mm.h | 6 ++++-- > mm/page_alloc.c | 5 ++++- > 2 files changed, 8 insertions(+), 3 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 00c8a54127d37..77737cbf2216a 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -2055,11 +2055,13 @@ static inline long folio_nr_pages(const struct folio *folio) > > /* Only hugetlbfs can allocate folios larger than MAX_ORDER */ > #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE > -#define MAX_FOLIO_NR_PAGES (1UL << PUD_ORDER) > +#define MAX_FOLIO_ORDER PUD_ORDER Do we need to check for CONTIG_ALLOC as well with CONFIG_ARCH_HAS_GIGANTIC_PAGE? > #else > -#define MAX_FOLIO_NR_PAGES MAX_ORDER_NR_PAGES > +#define MAX_FOLIO_ORDER MAX_PAGE_ORDER > #endif > > +#define MAX_FOLIO_NR_PAGES (1UL << MAX_FOLIO_ORDER) > + > /* > * compound_nr() returns the number of pages in this potentially compound > * page. compound_nr() can be called on a tail page, and is defined to > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index ca9e6b9633f79..1e6ae4c395b30 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -6833,6 +6833,7 @@ static int __alloc_contig_verify_gfp_mask(gfp_t gfp_mask, gfp_t *gfp_cc_mask) > int alloc_contig_range_noprof(unsigned long start, unsigned long end, > acr_flags_t alloc_flags, gfp_t gfp_mask) > { > + const unsigned int order = ilog2(end - start); Do we need a VM_WARN_ON(end < start)? > unsigned long outer_start, outer_end; > int ret = 0; > > @@ -6850,6 +6851,9 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end, > PB_ISOLATE_MODE_CMA_ALLOC : > PB_ISOLATE_MODE_OTHER; > > + if (WARN_ON_ONCE((gfp_mask & __GFP_COMP) && order > MAX_FOLIO_ORDER)) > + return -EINVAL; > + > gfp_mask = current_gfp_context(gfp_mask); > if (__alloc_contig_verify_gfp_mask(gfp_mask, (gfp_t *)&cc.gfp_mask)) > return -EINVAL; > @@ -6947,7 +6951,6 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end, > free_contig_range(end, outer_end - end); > } else if (start == outer_start && end == outer_end && is_power_of_2(end - start)) { > struct page *head = pfn_to_page(start); > - int order = ilog2(end - start); > > check_new_pages(head, order); > prep_new_page(head, order, gfp_mask, 0); Acked-by: Balbir Singh Balbir