[PATCH v2 hmm 5/9] mm/hmm: remove the CONFIG_TRANSPARENT_HUGEPAGE #ifdef

[Jason Gunthorpe]

From: Jason Gunthorpe <jgg at mellanox.com>

This code can be compiled when CONFIG_TRANSPARENT_HUGEPAGE is off, so
remove the ifdef.

The function is only ever called under

   if (pmd_devmap(pmd) || pmd_trans_huge(pmd))

Which is statically false if !CONFIG_TRANSPARENT_HUGEPAGE, so the compiler
reliably eliminates all of this code.

Reviewed-by: Ralph Campbell <rcampbell at nvidia.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Tested-by: Ralph Campbell <rcampbell at nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg at mellanox.com>
---
 mm/hmm.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 8dbd9e1d0308b4..3a71ec72b0a42f 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -193,7 +193,6 @@ static inline uint64_t pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd)
 				range->flags[HMM_PFN_VALID];
 }
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
 		unsigned long end, uint64_t *pfns, pmd_t pmd)
 {
@@ -216,11 +215,6 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
 	hmm_vma_walk->last = end;
 	return 0;
 }
-#else /* CONFIG_TRANSPARENT_HUGEPAGE */
-/* stub to allow the code below to compile */
-int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
-		unsigned long end, uint64_t *pfns, pmd_t pmd);
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 static inline bool hmm_is_device_private_entry(struct hmm_range *range,
 		swp_entry_t entry)
-- 
2.25.2