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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=no 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 A2351C433E0 for ; Mon, 8 Jun 2020 04:42:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 652092081A for ; Mon, 8 Jun 2020 04:42:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="uyWmLIsO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 652092081A 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 0D57E6B00C3; Mon, 8 Jun 2020 00:42:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 061416B00C5; Mon, 8 Jun 2020 00:42:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E6CFB6B00C6; Mon, 8 Jun 2020 00:42:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0209.hostedemail.com [216.40.44.209]) by kanga.kvack.org (Postfix) with ESMTP id C39586B00C3 for ; Mon, 8 Jun 2020 00:42:42 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 892E818197AB6 for ; Mon, 8 Jun 2020 04:42:42 +0000 (UTC) X-FDA: 76904798964.10.hands64_1d0879f26db7 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin10.hostedemail.com (Postfix) with ESMTP id 5F3503CC8C for ; Mon, 8 Jun 2020 04:42:42 +0000 (UTC) X-HE-Tag: hands64_1d0879f26db7 X-Filterd-Recvd-Size: 2391 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf16.hostedemail.com (Postfix) with ESMTP for ; Mon, 8 Jun 2020 04:42:41 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1616420885; Mon, 8 Jun 2020 04:42:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591591361; bh=J+M4Pufp9BorJqu8zW5HngFuYyMl6bwZ9NRqSXOP1cI=; h=Date:From:To:Subject:In-Reply-To:From; b=uyWmLIsOnukTD+rno36vL/yw4IfqsY7feMYUSetpJGxaguNr0HfGOjfY3a2gsmZEb F9Gw9sELGSJRaP9i9WbKPdJpKu3NND8Q5u8F/nIS5WOTuoPEumhggP03DxJhduogAG iin6T2WhQRjVuB7UITIsohYA2PMnH4cTEd3yKBEg= Date: Sun, 07 Jun 2020 21:42:40 -0700 From: Andrew Morton To: akpm@linux-foundation.org, hch@lst.de, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk Subject: [patch 49/54] exec: only build read_code when needed Message-ID: <20200608044240.ldWDPSJ67%akpm@linux-foundation.org> In-Reply-To: <20200607212615.b050e41fac139a1e16fe00bd@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 5F3503CC8C X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 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: Christoph Hellwig Subject: exec: only build read_code when needed Only build read_code when binary formats that use it are built into the kernel. Link: http://lkml.kernel.org/r/20200515143646.3857579-26-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Alexander Viro Signed-off-by: Andrew Morton --- fs/exec.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/exec.c~exec-only-build-read_code-when-needed +++ a/fs/exec.c @@ -1053,6 +1053,8 @@ out: } EXPORT_SYMBOL_GPL(kernel_read_file_from_fd); +#if defined(CONFIG_HAVE_AOUT) || defined(CONFIG_BINFMT_FLAT) || \ + defined(CONFIG_BINFMT_ELF_FDPIC) ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len) { ssize_t res = vfs_read(file, (void __user *)addr, len, &pos); @@ -1061,6 +1063,7 @@ ssize_t read_code(struct file *file, uns return res; } EXPORT_SYMBOL(read_code); +#endif /* * Maps the mm_struct mm into the current task struct. _