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=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 48666C32753 for ; Tue, 13 Aug 2019 12:19:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1CBFC20874 for ; Tue, 13 Aug 2019 12:19:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="A0rCIzO1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728090AbfHMMTd (ORCPT ); Tue, 13 Aug 2019 08:19:33 -0400 Received: from mail-yb1-f201.google.com ([209.85.219.201]:38403 "EHLO mail-yb1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728066AbfHMMTc (ORCPT ); Tue, 13 Aug 2019 08:19:32 -0400 Received: by mail-yb1-f201.google.com with SMTP id i70so81312557ybg.5 for ; Tue, 13 Aug 2019 05:19:31 -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=5NgEEOsuafidZLfBQW1+8uAN6YPDpjefZYyipohUb1w=; b=A0rCIzO1HrKULIk+ltl79te8oL+yJKIRwx4UrVJHdwUX5yyp9GYs4dLvAbOJIpGdfe HueqdJXhyRVPVVL2FD7vw9o8IFPjz8RV5MJFgd4D4QgTtlsXaiGnmkj+j5db4+GhrCeH mGslTVn5M6Kcv88zBxM1Kts/OutRv5gJuzAhbPJMte99LBE2JnN3XcGXe+j+Odn7ZszO MWmVH4oRFy2Iwj9q2XAHxuPIRFJcOw6YPazijDX0o/Xbxdkhjm3BS7GAUFGbobJbhgI5 uTLHjYkcDb/X4XeFDIsymMzyAmVcjMLbxWMLaOZrRKOBEl3e77UIqo9lAs2K+xAJ4PCq UspA== 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=5NgEEOsuafidZLfBQW1+8uAN6YPDpjefZYyipohUb1w=; b=T2ImlMcCHUB5D78xW6okBJezIwlwdrpinRtDo/3LmnR86VHxk2Vqdaud3FaVTswzQM Uax4bALNJbDpW/RaGHneRY0hjBiCD/FqanbrmK6gMLiLWuS/MozrQj/fCy100CGYH7nR EBveHAVDCnxfjQayPy4Y03NI6sDbJ1kjRKWSpaOOGPn3cy9Ym4aB7XZpskBCEfwarha0 JPJdu520r+jcrrQpz9Ryg4qCbwOf3SvfXTYGMo1n/Gvt6So9fk8RDUdzLotGWpLM6XW1 Wl736uH05jsPUdmzegPphBIpU517pgZvXMe2psGcd9jmhPmlwOTBikAkCGxeslQklwz6 MMaQ== X-Gm-Message-State: APjAAAXzmSXGXMz6AOrB7tofjKit5IyivIBR0dCvEATPeh6G5y9UN+qj YyAAgNns0/sWVr+MOuuG9s9IKIVeoekz0w== X-Google-Smtp-Source: APXvYqzofTNz2fbZb+Pu/dK4amOg+sOn20B/5a6YQykBvqxFwzTuJhcNhOKlhNTjO07MWW5j+Mv9I/hAS9Au7A== X-Received: by 2002:a81:1d84:: with SMTP id d126mr25341335ywd.199.1565698770861; Tue, 13 Aug 2019 05:19:30 -0700 (PDT) Date: Tue, 13 Aug 2019 13:17:03 +0100 In-Reply-To: <20190813121733.52480-1-maennich@google.com> Message-Id: <20190813121733.52480-7-maennich@google.com> Mime-Version: 1.0 References: <20180716122125.175792-1-maco@android.com> <20190813121733.52480-1-maennich@google.com> X-Mailer: git-send-email 2.23.0.rc1.153.gdeed80330f-goog Subject: [PATCH v2 06/10] export: allow definition default namespaces in Makefiles or sources From: Matthias Maennich To: linux-kernel@vger.kernel.org, maco@android.com Cc: kernel-team@android.com, maennich@google.com, arnd@arndb.de, geert@linux-m68k.org, gregkh@linuxfoundation.org, hpa@zytor.com, jeyu@kernel.org, joel@joelfernandes.org, kstewart@linuxfoundation.org, linux-arch@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-modules@vger.kernel.org, linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org, lucas.de.marchi@gmail.com, maco@google.com, michal.lkml@markovi.net, mingo@redhat.com, oneukum@suse.com, pombredanne@nexb.com, sam@ravnborg.org, sboyd@codeaurora.org, sspatil@google.com, stern@rowland.harvard.edu, tglx@linutronix.de, usb-storage@lists.one-eyed-alien.net, x86@kernel.org, yamada.masahiro@socionext.com, Ard Biesheuvel , Michael Ellerman Content-Type: text/plain; charset="UTF-8" Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org To avoid excessive usage of EXPORT_SYMBOL_NS(sym, MY_NAMESPACE), where MY_NAMESPACE will always be the namespace we are exporting to, allow exporting all definitions of EXPORT_SYMBOL() and friends by defining DEFAULT_SYMBOL_NAMESPACE. For example, to export all symbols defined in usb-common into the namespace USB_COMMON, add a line like this to drivers/usb/common/Makefile: ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=USB_COMMON That is equivalent to changing all EXPORT_SYMBOL(sym) definitions to EXPORT_SYMBOL_NS(sym, USB_COMMON). Subsequently all symbol namespaces functionality will apply. Another way of making use of this feature is to define the namespace within source or header files similar to how TRACE_SYSTEM defines are used: #undef DEFAULT_SYMBOL_NAMESPACE #define DEFAULT_SYMBOL_NAMESPACE USB_COMMON Please note that, as opposed to TRACE_SYSTEM, DEFAULT_SYMBOL_NAMESPACE has to be defined before including include/linux/export.h. If DEFAULT_SYMBOL_NAMESPACE is defined, a symbol can still be exported to another namespace by using EXPORT_SYMBOL_NS() and friends with explicitly specifying the namespace. Suggested-by: Arnd Bergmann Reviewed-by: Martijn Coenen Signed-off-by: Matthias Maennich --- include/linux/export.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/export.h b/include/linux/export.h index 8e12e05444d1..1fb243abdbc4 100644 --- a/include/linux/export.h +++ b/include/linux/export.h @@ -166,6 +166,12 @@ struct kernel_symbol { #define __EXPORT_SYMBOL ___EXPORT_SYMBOL #endif +#ifdef DEFAULT_SYMBOL_NAMESPACE +#undef __EXPORT_SYMBOL +#define __EXPORT_SYMBOL(sym, sec) \ + __EXPORT_SYMBOL_NS(sym, sec, DEFAULT_SYMBOL_NAMESPACE) +#endif + #define EXPORT_SYMBOL(sym) __EXPORT_SYMBOL(sym, "") #define EXPORT_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_gpl") #define EXPORT_SYMBOL_GPL_FUTURE(sym) __EXPORT_SYMBOL(sym, "_gpl_future") -- 2.23.0.rc1.153.gdeed80330f-goog