From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932216AbcHQT15 (ORCPT ); Wed, 17 Aug 2016 15:27:57 -0400 Received: from mail-wm0-f65.google.com ([74.125.82.65]:35404 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932171AbcHQT1y (ORCPT ); Wed, 17 Aug 2016 15:27:54 -0400 From: Cristina Moraru To: linux-kernel@vger.kernel.org Cc: mcgrof@kernel.org, teg@jklm.no, kay@vrfy.org, rusty@rustcorp.com.au, akpm@linux-foundation.org, Cristina Moraru Subject: [RFC PATCH 2/5] Add CONFIG symbol to module as compilation parameter Date: Wed, 17 Aug 2016 21:27:00 +0200 Message-Id: <1471462023-119645-3-git-send-email-cristina.moraru09@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1471462023-119645-1-git-send-email-cristina.moraru09@gmail.com> References: <1471462023-119645-1-git-send-email-cristina.moraru09@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add CONFIG symbol to kernel modules as a define via -D compilation parameter. The CONFIG_FOO symbol for each module is determined by the module name, using the associations from Module.ksymb. This file is loaded using the 'include' directive, thus run like a regular makefile. The format of the content of the file is the following: foo_KCONF=CONFIG_FOO creating a set of Makefile variables foo_KCONF with the CONFIG_FOO as values. The Makefile then adds this value in the compilation command with -DKBUILD_KCONF='"CONFIG_FOO"'. This patch is part of a research project within Google Summer of Code of porting 'make localmodconfig' for backported drivers. The goal is to enable each module to expose in /sys its corresponding CONFIG_* option. The value of this attribute will be dynamically pegged by modpost without requiring extra work from the driver developers. Further, this information will be used by a hardware interogation tool to extract build information about the existing devices. Signed-off-by: Cristina Moraru --- scripts/Makefile.lib | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index e7df0f5..8ae9b7f 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -89,6 +89,10 @@ multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) +# Include Module.ksymb which contains the associations of modules' names +# and corresponding CONFIG_* options +include Module.ksymb + # These flags are needed for modversions and compiling, so we define them here # already # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will @@ -100,6 +104,9 @@ name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote) basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) modname_flags = $(if $(filter 1,$(words $(modname))),\ -DKBUILD_MODNAME=$(call name-fix,$(modname))) +ksym-fix = $(squote)$(quote)$($(subst $(comma),_,$(subst -,_,$1))_KCONF)$(quote)$(squote) +ksymb_flags = $(if $(filter 1,$(words $(modname))),\ + -DKBUILD_KSYMB=$(call ksym-fix, $(modname))) orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ $(ccflags-y) $(CFLAGS_$(basetarget).o) @@ -162,7 +169,7 @@ endif c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(__c_flags) $(modkern_cflags) \ - $(basename_flags) $(modname_flags) + $(basename_flags) $(modname_flags) $(ksymb_flags) a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(__a_flags) $(modkern_aflags) -- 2.7.4