From patchwork Tue Mar 6 19:23:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 10262865 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3EA64602C8 for ; Tue, 6 Mar 2018 19:48:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2EA642916B for ; Tue, 6 Mar 2018 19:48:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 22FDF2916D; Tue, 6 Mar 2018 19:48:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A9EEE2916B for ; Tue, 6 Mar 2018 19:48:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754209AbeCFTsV (ORCPT ); Tue, 6 Mar 2018 14:48:21 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:48700 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753821AbeCFTYS (ORCPT ); Tue, 6 Mar 2018 14:24:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=8IO0rnKL1zknuNXws7LiWNSdEUpJKHZeYfIMYABSFKs=; b=ivDmVZNr+BwoYU9QcNLpxLGpf 37g8Tid4KtA8TyArmZzktJnwlkRuP3qHNP9+kz/FD362sCX25Qm74dTdSAt650jSW3PnjJKsU3JSL C23fb31cNgx6mOGsAT0xWbjjCkZPyJc+z38gUojExMqPZUjSwNx80Hb1o/f1erQBKkxfe8F5mI70X Ih+eRixwacN1x3H9HQ6lMaS7wTDYpxflmN5e3nabO2k6Jkf8Sxg/NFADbSngPb/oju+TUOCGXHMZD eUvO3qK7ctXtYqMdcxfwDCO631jR7DdJD6jKdPboABcpZ/yy65gIjWCMl1qiYsC+IPEhDxZnTqZS8 J0XI+UgdQ==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1etIC9-0001SV-MT; Tue, 06 Mar 2018 19:24:17 +0000 From: Matthew Wilcox To: Andrew Morton Cc: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Ryusuke Konishi , linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH v8 03/63] arm64: Turn flush_dcache_mmap_lock into a no-op Date: Tue, 6 Mar 2018 11:23:13 -0800 Message-Id: <20180306192413.5499-4-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180306192413.5499-1-willy@infradead.org> References: <20180306192413.5499-1-willy@infradead.org> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 bef9f418f089..550b0abea953 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -137,10 +137,8 @@ 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