From 030e347430957f6f7f29db9099368f8b86c0bf76 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Sat, 1 Feb 2020 08:04:31 +0000 Subject: [PATCH] powerpc/32s: Don't flush all TLBs when flushing one page When flushing any memory range, the flushing function flushes all TLBs. When (start) and (end - 1) are in the same memory page, flush that page instead. Signed-off-by: Christophe Leroy Reviewed-by: Segher Boessenkool Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b30b2eae6960502eaf0d9e36c60820b839693c33.1580542939.git.christophe.leroy@c-s.fr --- arch/powerpc/mm/book3s32/tlb.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c index 2fcd321040ff..724c0490fb17 100644 --- a/arch/powerpc/mm/book3s32/tlb.c +++ b/arch/powerpc/mm/book3s32/tlb.c @@ -79,11 +79,14 @@ static void flush_range(struct mm_struct *mm, unsigned long start, int count; unsigned int ctx = mm->context.id; + start &= 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;