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powerpc/iommu: Do not call PageTransHuge() on tail pages

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The CMA pages migration code does not support compound pages at
the moment so it performs few tests before proceeding to actual page
migration.

One of the tests - PageTransHuge() - has VM_BUG_ON_PAGE(PageTail()) as
it is designed to be called on head pages only. Since we also test for
PageCompound(), and it contains PageTail() and PageHead(), we can
simplify the check by leaving just PageCompound() and therefore avoid
possible VM_BUG_ON_PAGE.

Fixes: 2e5bbb5461 ("KVM: PPC: Book3S HV: Migrate pinned pages out of CMA")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy 2017-04-11 17:54:57 +10:00 committed by Michael Ellerman
parent 321f7d29e5
commit e889e96e98
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/mm/mmu_context_iommu.c
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@ -81,7 +81,7 @@ struct page *new_iommu_non_cma_page(struct page *page, unsigned long private,
gfp_t gfp_mask = GFP_USER;
struct page *new_page;
if (PageHuge(page) || PageTransHuge(page) || PageCompound(page))
if (PageCompound(page))
return NULL;
if (PageHighMem(page))
@ -100,7 +100,7 @@ static int mm_iommu_move_page_from_cma(struct page *page)
LIST_HEAD(cma_migrate_pages);
/* Ignore huge pages for now */
if (PageHuge(page) || PageTransHuge(page) || PageCompound(page))
if (PageCompound(page))
return -EBUSY;
lru_add_drain();