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Howlett" To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan Subject: Re: [PATCH v1 08/36] mm/hugetlb: check for unreasonable folio sizes when registering hstate Message-ID: <3cw5er2nr2pnht456e6fh5lassb6y5z64xk3g7ffrao2glkmx7@os7byqmcuddp> Mail-Followup-To: "Liam R. 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If we were to succeed registering, we > could later try allocating an unsupported gigantic folio size. > > Further, let's add a BUILD_BUG_ON() for checking that HUGETLB_PAGE_ORDER > is sane at build time. As HUGETLB_PAGE_ORDER is dynamic on powerpc, we have > to use a BUILD_BUG_ON_INVALID() to make it compile. > > No existing kernel configuration should be able to trigger this check: > either SPARSEMEM without SPARSEMEM_VMEMMAP cannot be configured or > gigantic folios will not exceed a memory section (the case on sparse). > > Signed-off-by: David Hildenbrand Reviewed-by: Liam R. Howlett > --- > mm/hugetlb.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 572b6f7772841..4a97e4f14c0dc 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -4657,6 +4657,7 @@ static int __init hugetlb_init(void) > > BUILD_BUG_ON(sizeof_field(struct page, private) * BITS_PER_BYTE < > __NR_HPAGEFLAGS); > + BUILD_BUG_ON_INVALID(HUGETLB_PAGE_ORDER > MAX_FOLIO_ORDER); > > if (!hugepages_supported()) { > if (hugetlb_max_hstate || default_hstate_max_huge_pages) > @@ -4740,6 +4741,7 @@ void __init hugetlb_add_hstate(unsigned int order) > } > BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); > BUG_ON(order < order_base_2(__NR_USED_SUBPAGE)); > + WARN_ON(order > MAX_FOLIO_ORDER); > h = &hstates[hugetlb_max_hstate++]; > __mutex_init(&h->resize_lock, "resize mutex", &h->resize_key); > h->order = order; > -- > 2.50.1 > >