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mm: sanity-check maximum folio size in folio_set_order()

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Let's sanity-check in folio_set_order() whether we would be trying to
create a folio with an order that would make it exceed MAX_FOLIO_ORDER.

This will enable the check whenever a folio/compound page is initialized
through prepare_compound_head() / prepare_compound_page() with
CONFIG_DEBUG_VM set.

Link: https://lkml.kernel.org/r/20250901150359.867252-11-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand
2025-09-01 17:03:31 +02:00
committed by Andrew Morton
parent 50765b46ab
commit 99132d24d7
1 changed files with 1 additions and 0 deletions
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mm/internal.h
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@@ -755,6 +755,7 @@ static inline void folio_set_order(struct folio *folio, unsigned int order)
{
if (WARN_ON_ONCE(!order || !folio_test_large(folio)))
return;
VM_WARN_ON_ONCE(order > MAX_FOLIO_ORDER);
folio->_flags_1 = (folio->_flags_1 & ~0xffUL) | order;
#ifdef NR_PAGES_IN_LARGE_FOLIO