[PATCH] powerpc/32s: Don't flush all TLBs when flushing one page

[Christophe Leroy]

When flushing a range, the flushing function flushes all TLBs.

When the range is a single page, do a page flush instead.

Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
---
 arch/powerpc/mm/book3s32/tlb.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c
index 2fcd321040ff..8e0089065a7e 100644
--- a/arch/powerpc/mm/book3s32/tlb.c
+++ b/arch/powerpc/mm/book3s32/tlb.c
@@ -79,14 +79,17 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
 	int count;
 	unsigned int ctx = mm->context.id;
 
+	start &= PAGE_MASK;
+	end = (end - 1) | ~PAGE_MASK;
 	if (!Hash) {
-		_tlbia();
+		if (end - start == PAGE_SIZE)
+			_tlbie(start);
+		else
+			_tlbia();
 		return;
 	}
-	start &= PAGE_MASK;
 	if (start >= end)
 		return;
-	end = (end - 1) | ~PAGE_MASK;
 	pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
 	for (;;) {
 		pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
-- 
2.25.0