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 6B8ECC433DB for ; Fri, 26 Feb 2021 01:22:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E634D64F14 for ; Fri, 26 Feb 2021 01:22:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E634D64F14 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 750346B010D; Thu, 25 Feb 2021 20:22:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6FFF28D0006; Thu, 25 Feb 2021 20:22:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6160F8D0005; Thu, 25 Feb 2021 20:22:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0247.hostedemail.com [216.40.44.247]) by kanga.kvack.org (Postfix) with ESMTP id 4B42A6B010D for ; Thu, 25 Feb 2021 20:22:25 -0500 (EST) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1D5C318451401 for ; Fri, 26 Feb 2021 01:22:25 +0000 (UTC) X-FDA: 77858668650.29.D12C9CF Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf10.hostedemail.com (Postfix) with ESMTP id 1E393407F8EB for ; Fri, 26 Feb 2021 01:22:19 +0000 (UTC) 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 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 1E393407F8EB X-Stat-Signature: x6mkb73ptmcx9p9uz74btjgtigjaekpb Received-SPF: none (linux-foundation.org>: No applicable sender policy available) receiver=imf10; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614302539-97128 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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); _