From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v9 03/61] arm64: Turn flush_dcache_mmap_lock into a no-op Date: Tue, 13 Mar 2018 06:25:41 -0700 Message-ID: <20180313132639.17387-4-willy@infradead.org> References: <20180313132639.17387-1-willy@infradead.org> Return-path: 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=lRwqAg9yO1KXEjTm9Y3lyHOwtX2RN7vMIDvC03R853w=; b=IqbEQKR42pZu+6lqDPgMMc4/A ORS1bEqvia1v44eRDt/z/gXgGJkM8lbLBe/BCakzYBtLP1AueZBlojrBRnShc5eVtC/mTItqC/RRv KG7xN8QhLYsFMeYEfMLQHa0Iax8SPyGQEAB7EkdNuOQnmxMbwjpSwJ787VWMIvWf/rTpJ5Agpv7QP pTr/DvVkTuMqqxThI2M7v8qEX3leoNdmx/Y/P74pl24owxYPGMp/vi9kKlMmMqKtnKBbXq5xlHtje yETkXTV4vfvqKbEmpGuHObMm8qiwuR7sh0EU1eJ+Mds1ghEGaZJMJqy1GeMimjM8gEoI/quekLHry In-Reply-To: <20180313132639.17387-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 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 7dfcec4700fe..0094c6653b06 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -140,10 +140,8 @@ 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 -- 2.16.1