[PATCH] mm: remove lock validation check for MADV_FREE

[Minchan Kim]

Curretnly, madvise_free_pte_range is called only madvise path
which already holds an mmap_sem so it's pointless to add the
lock validation check.

Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
 mm/madvise.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index dc024effa9bf..6fc9b8298da1 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -275,18 +275,9 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
 
 	next = pmd_addr_end(addr, end);
 	if (pmd_trans_huge(*pmd)) {
-		if (next - addr != HPAGE_PMD_SIZE) {
-#ifdef CONFIG_DEBUG_VM
-			if (!rwsem_is_locked(&mm->mmap_sem)) {
-				pr_err("%s: mmap_sem is unlocked! addr=0x%lx end=0x%lx vma->vm_start=0x%lx vma->vm_end=0x%lx\n",
-					__func__, addr, end,
-					vma->vm_start,
-					vma->vm_end);
-				BUG();
-			}
-#endif
+		if (next - addr != HPAGE_PMD_SIZE)
 			split_huge_page_pmd(vma, addr, pmd);
-		} else if (!madvise_free_huge_pmd(tlb, vma, pmd, addr))
+		else if (!madvise_free_huge_pmd(tlb, vma, pmd, addr))
 			goto next;
 		/* fall through */
 	}
-- 
2.0.0


-- 
Kind regards,
Minchan Kim
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