From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751934AbdKVVIV (ORCPT ); Wed, 22 Nov 2017 16:08:21 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:36823 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751459AbdKVVIQ (ORCPT ); Wed, 22 Nov 2017 16:08:16 -0500 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Matthew Wilcox , com@infradead.org Subject: [PATCH 09/62] arm64: Turn flush_dcache_mmap_lock into a no-op Date: Wed, 22 Nov 2017 13:06:46 -0800 Message-Id: <20171122210739.29916-10-willy@infradead.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20171122210739.29916-1-willy@infradead.org> References: <20171122210739.29916-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matthew Wilcox ARM64 doesn't walk the VMA tree in its flush_dcache_page() implementation, so has no need to take the tree_lock. Signed-off-by: Matthew Wilcox Reviewed-by: Will Deacon --- arch/arm64/include/asm/cacheflush.h | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index 76d1cc85d5b1..568f83533f12 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -130,10 +130,8 @@ static inline void __flush_icache_all(void) dsb(ish); } -#define flush_dcache_mmap_lock(mapping) \ - spin_lock_irq(&(mapping)->tree_lock) -#define flush_dcache_mmap_unlock(mapping) \ - spin_unlock_irq(&(mapping)->tree_lock) +#define flush_dcache_mmap_lock(mapping) do { } while (0) +#define flush_dcache_mmap_unlock(mapping) do { } while (0) /* * We don't appear to need to do anything here. In fact, if we did, we'd -- 2.15.0