From: "Oliver O'Halloran" <oohall@xxxxxxxxx>
Subject: mm/gup: make __gup_device_* require THP
These functions are the only bits of generic code that use {pud,pmd}_pfn()
without checking for CONFIG_TRANSPARENT_HUGEPAGE. This works fine on x86,
the only arch with devmap support, since the *_pfn() functions are always
defined there, but this isn't true for every architecture.
Link: http://lkml.kernel.org/r/20170626063833.11094-1-oohall@xxxxxxxxx
Signed-off-by: Oliver O'Halloran <oohall@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/gup.c~mm-gup-make-__gup_device_-require-thp mm/gup.c
--- a/mm/gup.c~mm-gup-make-__gup_device_-require-thp
+++ a/mm/gup.c
@@ -1352,7 +1352,7 @@ static int gup_pte_range(pmd_t pmd, unsi
}
#endif /* __HAVE_ARCH_PTE_SPECIAL */
-#ifdef __HAVE_ARCH_PTE_DEVMAP
+#if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
static int __gup_device_huge(unsigned long pfn, unsigned long addr,
unsigned long end, struct page **pages, int *nr)
{
_
--
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