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,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 07E25C433DB for ; Fri, 26 Feb 2021 01:23:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC27B64EE4 for ; Fri, 26 Feb 2021 01:23:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229460AbhBZBXi (ORCPT ); Thu, 25 Feb 2021 20:23:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:52886 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230090AbhBZBWw (ORCPT ); Thu, 25 Feb 2021 20:22:52 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id DC9E664EE1; Fri, 26 Feb 2021 01:22:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1614302543; bh=ffuApzQHIWKWY/j/xFPHkObXjodTFLYr7HMtdtFeOx4=; h=Date:From:To:Subject:In-Reply-To:From; b=yeWRxltJn9xB3WaJtaGvDhFYCxSS8JJNCFJFGFrhqRfq50TpXExmlE0GZ7pxHAqH+ g2IYy3yS8BGqjAz0LLH3xdsB44MPA/YsMB0bkvaSuJwjSj8Opg5Kf51ffWDr89gw4z +6KVvevMBr0r3j+qsvvfj0nlIq2g89ydqqKg5VIs= Date: Thu, 25 Feb 2021 17:22:22 -0800 From: Andrew Morton To: akpm@linux-foundation.org, ira.weiny@intel.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk Subject: [patch 111/118] fs/coredump: use kmap_local_page() Message-ID: <20210226012222.PVvo5D3vN%akpm@linux-foundation.org> In-Reply-To: <20210225171452.713967e96554bb6a53e44a19@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Ira Weiny Subject: fs/coredump: use kmap_local_page() In dump_user_range() there is no reason for the mapping to be global. Use kmap_local_page() rather than kmap. Link: https://lkml.kernel.org/r/20210203223328.558945-1-ira.weiny@intel.com Signed-off-by: Ira Weiny Cc: Alexander Viro Signed-off-by: Andrew Morton --- fs/coredump.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/coredump.c~fs-coredump-use-kmap_local_page +++ a/fs/coredump.c @@ -897,10 +897,10 @@ int dump_user_range(struct coredump_para */ page = get_dump_page(addr); if (page) { - void *kaddr = kmap(page); + void *kaddr = kmap_local_page(page); stop = !dump_emit(cprm, kaddr, PAGE_SIZE); - kunmap(page); + kunmap_local(kaddr); put_page(page); } else { stop = !dump_skip(cprm, PAGE_SIZE); _