[PATCH v11 04/10] arm64/hugetlb: drop the init_mm special case in clear_flush()

[Wen Jiang]

From: Wen Jiang <jiangwen6@xxxxxxxxxx>

clear_flush() calls flush_tlb_kernel_range() when mm is &init_mm. This
was added by commit 06fc959fcff7 ("arm64/mm: Support huge pte-mapped
pages in vmap") because vmap called set_huge_pte_at(&init_mm, ...).

Now that vmap uses vmap_pte_set_huge()/vmap_pte_clear_huge(),
mm/vmalloc.c is no longer a caller of set_huge_pte_at() on arm64. The
only remaining callers passing &init_mm are in arch/powerpc, which uses
its own implementation. Remove the dead branch.

No functional change.

Signed-off-by: Wen Jiang <jiangwen6@xxxxxxxxxx>
Reviewed-by: Barry Song <baohua@xxxxxxxxxx>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Reviewed-by: Dev Jain <dev.jain@xxxxxxx>
---
 arch/arm64/mm/hugetlbpage.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 8e799c1fe0aa..ce247b06fe03 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -206,10 +206,7 @@ static void clear_flush(struct mm_struct *mm,
 	for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
 		__ptep_get_and_clear_anysz(mm, addr, ptep, pgsize);
 
-	if (mm == &init_mm)
-		flush_tlb_kernel_range(saddr, addr);
-	else
-		__flush_hugetlb_tlb_range(&vma, saddr, addr, pgsize, TLBF_NOWALKCACHE);
+	__flush_hugetlb_tlb_range(&vma, saddr, addr, pgsize, TLBF_NOWALKCACHE);
 }
 
 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
-- 
2.34.1