[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.le...@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