From patchwork Wed Aug 21 11:49:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Maennich X-Patchwork-Id: 11106471 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 0F3FE13B1 for ; Wed, 21 Aug 2019 11:54:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E1DAF2339F for ; Wed, 21 Aug 2019 11:54:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="sL78SFBJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727959AbfHULyc (ORCPT ); Wed, 21 Aug 2019 07:54:32 -0400 Received: from mail-vs1-f74.google.com ([209.85.217.74]:42561 "EHLO mail-vs1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727929AbfHULyc (ORCPT ); Wed, 21 Aug 2019 07:54:32 -0400 Received: by mail-vs1-f74.google.com with SMTP id g1so628258vso.9 for ; Wed, 21 Aug 2019 04:54:31 -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=rT0KSU6kg1U7KAakAlt0j+Yalj1dCKE373XdhjaHS/Y=; b=sL78SFBJ7FLQgHM0KvFFBQfHGyZBRIG9AKMMPahPrreho6GZ7q/hi1HXcChLC7EStO Ojrr18OFXwtTmjjJGN2mirgUwSuhnghkVNaYnBO9OFrTnLuS2GdPAaYBmv4cqljzY8Jl EbcPdMJPRYjW4xTocUDZ0DUWLHN7qa3uA82NvUxR8jbI+KfBdv4C/qi0yrz6m1JKUJV3 APKYs3B0H/xC+dXi9Or4SKjhuHehlV48wcTBTXAIe4N3IU/1KA+PGO9xSwfC//sr9iTR 13qg8sPQBD24vebJsBEVWuh2b3IIdnKFAhy7luPXgP+dREwvWqQStxe9jGj+9mGONgEh OHkg== 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=rT0KSU6kg1U7KAakAlt0j+Yalj1dCKE373XdhjaHS/Y=; b=hLVte621QxA7F1i6OAAtHgDr118gSO0OHHEnYRk9OyYMwrfNyi4eTJa0pZTycHk4Jo 0Go8NOeIeE8tvK5rc0fdQC5eHo17vnEwkWcN+XWRT7W2eHXystxW9+I8wFYw4LqYtuf3 7L+exZmwl4eHmEJITIsIVH2QDibH58gN5eV2lcye050NtmdAk3XxzcdCUy3uF/QlNliE ApgVTKzsRfFV1mDEAKx1D6fqO/ajnyXrlcShhfSSeKUBZTgPW6DgcxcFAZ/uLSWt1g6s J+swEdqDurRTMvbkP4rU/967IgukxIpugS/4SBIkEt4MC+xXr7DfkVcRBT7lZdlrNebm Rmgw== X-Gm-Message-State: APjAAAUVeN5zQfP94lCi2IBZXZRJdjBQKt0mWHYj01tvAaCETmNnQYSl 2a4DmkuDZ+LKjlIvLX18mx4TjWQRt3/MOQ== X-Google-Smtp-Source: APXvYqwJa5MMHL1L/Kpr0qJVI9N7n4kQrm4ogFR+PTqANm6lE14ye/6fboCOGimHuOIQftsP5yUiGv+IVJhNKw== X-Received: by 2002:ab0:5fd4:: with SMTP id g20mr2062332uaj.111.1566388470706; Wed, 21 Aug 2019 04:54:30 -0700 (PDT) Date: Wed, 21 Aug 2019 12:49:21 +0100 In-Reply-To: <20190821114955.12788-1-maennich@google.com> Message-Id: <20190821114955.12788-7-maennich@google.com> Mime-Version: 1.0 References: <20190813121733.52480-1-maennich@google.com> <20190821114955.12788-1-maennich@google.com> X-Mailer: git-send-email 2.23.0.rc1.153.gdeed80330f-goog Subject: [PATCH v3 06/11] export: allow definition default namespaces in Makefiles or sources From: Matthias Maennich To: linux-kernel@vger.kernel.org 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@android.com, maco@google.com, michal.lkml@markovi.net, mingo@redhat.com, oneukum@suse.com, pombredanne@nexb.com, sam@ravnborg.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, Michael Ellerman , Ingo Molnar , Ard Biesheuvel Sender: owner-linux-modules@vger.kernel.org Precedence: bulk List-ID: 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 Reviewed-by: Greg Kroah-Hartman 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")