From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0B64C433E0 for ; Mon, 8 Mar 2021 13:02:09 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7CD9564FB3 for ; Mon, 8 Mar 2021 13:02:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7CD9564FB3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5EWzAj9MjLcoTyLN9bmOLoFW/j9iabM1eNNMg6HU4x8=; b=oPDp98hWPsGchmBOZHX6YnTRW 4neyMgZzyn2w9n+QXNlKplxvXJHf7AFpO4d0gpvG/UA4q12thw2meuKMpCGaE/TwlJ86faVfqiW/N vQAPnFFkS+iwh1K2D+X8iH2+utpEJLp5knlQ+0CkAWHguuVZaIGMugacgOBCwrIfx+roUS+5KFpfi fNHtMvGt/Bx3bSAo6QQSmKj+K7F1BE6Hzf2j1rZGr5jnH+v9y1RMXESaRi1T14HiWghb0zucfjyj0 sG6NFB3ec7oRUi6nABSeALzWv3lKy8r5YTCEDAt+v/TCJfbq6jl6rfrqogNcUlytKFgco2+vBqtpt Jv5JPZBZg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lJFUX-00HILa-Ek; Mon, 08 Mar 2021 13:00:09 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lJFUH-00HIEJ-FY for linux-arm-kernel@lists.infradead.org; Mon, 08 Mar 2021 12:59:55 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id A40A364FB3; Mon, 8 Mar 2021 12:59:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615208391; bh=wxbL/Pa2LuwpiP3JjTmeepdQiCQNIv7MrwRtEg7zXKs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Axro0NZGoslIDIELA+vcrcmqfYkqa2Kispoq8GG1PhQ+GbLbBiVjYT8i8jgLKG4+t 0fv43dyqgy73NVWZvlxfP7NEXWO08+h2cNMWE5stsP7Xn2lITSc9qLMVnWFStmBVXE vs1r1s8hmLch1KCzGcG4ydisTj2Ge23kJtK8xl42cLMN2A8UiDNErKDw5DcZHIFbD6 9K8aQt38rkcpeItasZYjaZvhNVeGX18YxVC/VGGk2v8hRYu0rhxACMwLvrBvkRVoeZ F7aueLZ/eZ9SROhzZ4ZBToOl9R3Tct1GI87ov0yEXcXIT5M1xYVSUtTNMog3TwlzFj rbibwoRAigyVA== Date: Mon, 8 Mar 2021 12:59:46 +0000 From: Will Deacon To: Barry Song Cc: corbet@lwn.net, linux-doc@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxarm@openeuler.org, Mel Gorman , Andy Lutomirski , Catalin Marinas Subject: Re: [PATCH] Documentation/features: mark BATCHED_UNMAP_TLB_FLUSH doesn't apply to ARM64 Message-ID: <20210308125946.GA26015@willie-the-truck> References: <20210223003230.11976-1-song.bao.hua@hisilicon.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210223003230.11976-1-song.bao.hua@hisilicon.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210308_125953_729560_96D4F11E X-CRM114-Status: GOOD ( 20.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Feb 23, 2021 at 01:32:30PM +1300, Barry Song wrote: > BATCHED_UNMAP_TLB_FLUSH is used on x86 to do batched tlb shootdown by > sending one IPI to TLB flush all entries after unmapping pages rather > than sending an IPI to flush each individual entry. > On arm64, tlb shootdown is done by hardware. Flush instructions are > innershareable. The local flushes are limited to the boot (1 per CPU) > and when a task is getting a new ASID. > So marking this feature as "TODO" is not proper. ".." isn't good as > well. So this patch adds a "N/A" for this kind of features which are > not needed on some architectures. > > Cc: Mel Gorman > Cc: Andy Lutomirski > Cc: Catalin Marinas > Cc: Will Deacon > Signed-off-by: Barry Song > --- > Documentation/features/arch-support.txt | 1 + > Documentation/features/vm/TLB/arch-support.txt | 2 +- > 2 files changed, 2 insertions(+), 1 deletion(-) > > diff --git a/Documentation/features/arch-support.txt b/Documentation/features/arch-support.txt > index d22a1095e661..118ae031840b 100644 > --- a/Documentation/features/arch-support.txt > +++ b/Documentation/features/arch-support.txt > @@ -8,4 +8,5 @@ The meaning of entries in the tables is: > | ok | # feature supported by the architecture > |TODO| # feature not yet supported by the architecture > | .. | # feature cannot be supported by the hardware > + | N/A| # feature doesn't apply to the architecture > > diff --git a/Documentation/features/vm/TLB/arch-support.txt b/Documentation/features/vm/TLB/arch-support.txt > index 30f75a79ce01..0d070f9f98d8 100644 > --- a/Documentation/features/vm/TLB/arch-support.txt > +++ b/Documentation/features/vm/TLB/arch-support.txt > @@ -9,7 +9,7 @@ > | alpha: | TODO | > | arc: | TODO | > | arm: | TODO | > - | arm64: | TODO | > + | arm64: | N/A | > | c6x: | .. | > | csky: | TODO | > | h8300: | .. | Acked-by: Will Deacon Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel