From patchwork Fri Oct 18 09:31:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Maennich X-Patchwork-Id: 11197883 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 410FF913 for ; Fri, 18 Oct 2019 09:32:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 201EB21852 for ; Fri, 18 Oct 2019 09:32:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Ua0IlvQY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409757AbfJRJcE (ORCPT ); Fri, 18 Oct 2019 05:32:04 -0400 Received: from mail-wr1-f74.google.com ([209.85.221.74]:54706 "EHLO mail-wr1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409753AbfJRJcD (ORCPT ); Fri, 18 Oct 2019 05:32:03 -0400 Received: by mail-wr1-f74.google.com with SMTP id e14so2312516wrm.21 for ; Fri, 18 Oct 2019 02:32:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=VWGgVtR20by6j5rWakK1xLjIPHuT7TbYDPbUDce3jrs=; b=Ua0IlvQYhxOOW8wlwRn+1w0mDAE59j1sHlig/IMGI74mwajHhYIjQ9GKXDeOOyTgSZ ZGl7isYwxCBZtNDYo1vf+29g/OCYPgiD98wV9UE0KnFfyXsQoX6Zbt8Ak9nnFy+/X4AH CPZMiK3s2JYPYvDDU5WrDeu0S0G2hho5YKlZC9/vN9X50jfxqM+EmkZ9Erfzz1GjuVWg 59KXAHzuI2yp1hSPgTO6MZGoZjfN2N48kYPenYgZr1Thv0lsOfs372ZBQKuLTpc9NyDl wajPxgxdjn1brnWwhIHvTcQyQxzG6fYrKMqKr7i0VfHVi3NfZXaxG8Xi3IFY+uG3O6Qn ADIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=VWGgVtR20by6j5rWakK1xLjIPHuT7TbYDPbUDce3jrs=; b=Zn8HcZ3RUeW7bX56o4s27tDWOE5tX1fm/ynVham9GY2Tkh3su3gLe9IK7iOZKPlaxs rB5ZP+LjNfMybLU6lCSEcLSXMbSfTEOmAHOlz18EMsQEPciY+ks0XPaUYcHC3zQ+Xpzf GBkF+doky/fYxQ6R96K/MRlINUbNLakUUz/6surwqG6xR/NW1AsIJ0siGj0h5jrr8GBL 4ZXPA6MR7lZ/5ZRPQvU0j1j7Dtm3SoxEi91XIjayLYUNqTBpeRawjOu7bBbtfXC6tBGQ OLLcFsxSckwEYDZczVtTf2p7O3T5Tj68ofds/mRwhIhuUOmPOOZ6w13HdSykV1iD+ALt 0fog== X-Gm-Message-State: APjAAAWN7jVMfE/B6MLdujmRrwYXabFCkBKlMQD5FAVsXurfsKauMUQa qZL6qRYeeLOEWlQyxMHN7qZ426AT+dXZ8w== X-Google-Smtp-Source: APXvYqys3kM1GQPDID5IamEIJmq2t+9rGBLKuJ1Nxz6Q9/oGyOyyywzsfxCxcMrStAkX4m3Nn3FWNdhhUwceLA== X-Received: by 2002:adf:e2cc:: with SMTP id d12mr7076584wrj.345.1571391119582; Fri, 18 Oct 2019 02:31:59 -0700 (PDT) Date: Fri, 18 Oct 2019 10:31:40 +0100 In-Reply-To: <20191018093143.15997-1-maennich@google.com> Message-Id: <20191018093143.15997-2-maennich@google.com> Mime-Version: 1.0 References: <20191010151443.7399-1-maennich@google.com> <20191018093143.15997-1-maennich@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH v2 1/4] modpost: delegate updating namespaces to separate function From: Matthias Maennich To: linux-kernel@vger.kernel.org Cc: kernel-team@android.com, maennich@google.com, Jessica Yu , Masahiro Yamada , Martijn Coenen , Lucas De Marchi , Shaun Ruffell , Greg Kroah-Hartman , Will Deacon , linux-kbuild@vger.kernel.org, linux-modules@vger.kernel.org Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Let the function 'sym_update_namespace' take care of updating the namespace for a symbol. While this currently only replaces one single location where namespaces are updated, in a following patch, this function will get more call sites. The function signature is intentionally close to sym_update_crc and taking the name by char* seems like unnecessary work as the symbol has to be looked up again. In a later patch of this series, this concern will be addressed. This function ensures that symbol::namespace is either NULL or has a valid non-empty value. Previously, the empty string was considered 'no namespace' as well and this lead to confusion. Acked-by: Will Deacon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Masahiro Yamada Signed-off-by: Matthias Maennich --- scripts/mod/modpost.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 4d2cdb4d71e3..dbfa3997136b 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -362,6 +362,25 @@ static char *sym_extract_namespace(const char **symname) return namespace; } +static void sym_update_namespace(const char *symname, const char *namespace) +{ + struct symbol *s = find_symbol(symname); + + /* + * That symbol should have been created earlier and thus this is + * actually an assertion. + */ + if (!s) { + merror("Could not update namespace(%s) for symbol %s\n", + namespace, symname); + return; + } + + free(s->namespace); + s->namespace = + namespace && namespace[0] ? NOFAIL(strdup(namespace)) : NULL; +} + /** * Add an exported symbol - it may have already been added without a * CRC, in this case just update the CRC @@ -383,8 +402,7 @@ static struct symbol *sym_add_exported(const char *name, const char *namespace, s->module = mod; } } - free(s->namespace); - s->namespace = namespace ? strdup(namespace) : NULL; + sym_update_namespace(name, namespace); s->preloaded = 0; s->vmlinux = is_vmlinux(mod->name); s->kernel = 0; @@ -2196,7 +2214,7 @@ static int check_exports(struct module *mod) else basename = mod->name; - if (exp->namespace && exp->namespace[0]) { + if (exp->namespace) { add_namespace(&mod->required_namespaces, exp->namespace);