[PATCH 01/18] hugetlb_vmemmap: Always flush TLB if needed upon PTE remapping

[James Houghton]

vmemmap_remap_range() can potentially leave the vmemmap in a partially
optimized state. In this case, a TLB flush should be done if the walk
caller asked for it, even if the optimization was not fully applied.

A follow-up patch will more completely deal with partially-optimized
folios.

Signed-off-by: James Houghton <jthoughton@xxxxxxxxxx>
---
 mm/hugetlb_vmemmap.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index 133b46dfb09f..da29954e9533 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -164,13 +164,11 @@ static int vmemmap_remap_range(unsigned long start, unsigned long end,
 	ret = walk_kernel_page_table_range(start, end, &vmemmap_remap_ops,
 				    NULL, walk);
 	mmap_read_unlock(&init_mm);
-	if (ret)
-		return ret;
 
 	if (walk->remap_pte && !(walk->flags & VMEMMAP_REMAP_NO_TLB_FLUSH))
 		flush_tlb_kernel_range(start, end);
 
-	return 0;
+	return ret;
 }
 
 /*
-- 
2.55.0.795.g602f6c329a-goog