[PATCH 12/13] mm: cleanup the hmm_vma_walk_hugetlb_entry stub

From: Christoph Hellwig <hch@lst.de>
To: "Jérôme Glisse" <jglisse@redhat.com>,
	"Jason Gunthorpe" <jgg@mellanox.com>,
	"Ben Skeggs" <bskeggs@redhat.com>,
	"Felix Kuehling" <Felix.Kuehling@amd.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>,
	linux-mm@kvack.org, nouveau@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 12/13] mm: cleanup the hmm_vma_walk_hugetlb_entry stub
Date: Tue, 30 Jul 2019 08:52:02 +0300	[thread overview]
Message-ID: <20190730055203.28467-13-hch@lst.de> (raw)
In-Reply-To: <20190730055203.28467-1-hch@lst.de>

Stub out the whole function and assign NULL to the .hugetlb_entry method
if CONFIG_HUGETLB_PAGE is not set, as the method won't ever be called in
that case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 mm/hmm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index f4e90ea5779f..2b56a4af1001 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -769,11 +769,11 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
 #define hmm_vma_walk_pud	NULL
 #endif
 
+#ifdef CONFIG_HUGETLB_PAGE
 static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
 				      unsigned long start, unsigned long end,
 				      struct mm_walk *walk)
 {
-#ifdef CONFIG_HUGETLB_PAGE
 	unsigned long addr = start, i, pfn;
 	struct hmm_vma_walk *hmm_vma_walk = walk->private;
 	struct hmm_range *range = hmm_vma_walk->range;
@@ -812,10 +812,10 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
 		return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
 
 	return ret;
-#else /* CONFIG_HUGETLB_PAGE */
-	return -EINVAL;
-#endif
 }
+#else
+#define hmm_vma_walk_hugetlb_entry NULL
+#endif /* CONFIG_HUGETLB_PAGE */
 
 static void hmm_pfns_clear(struct hmm_range *range,
 			   uint64_t *pfns,
-- 
2.20.1

