From patchwork Thu Aug 9 20:15:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nadav Amit X-Patchwork-Id: 10561893 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7B131139A for ; Thu, 9 Aug 2018 20:17:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 688E02B8CF for ; Thu, 9 Aug 2018 20:17:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5C1C52B9B1; Thu, 9 Aug 2018 20:17:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 957482B8CF for ; Thu, 9 Aug 2018 20:17:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727242AbeHIWoG (ORCPT ); Thu, 9 Aug 2018 18:44:06 -0400 Received: from ex13-edg-ou-001.vmware.com ([208.91.0.189]:15158 "EHLO EX13-EDG-OU-001.vmware.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726894AbeHIWoF (ORCPT ); Thu, 9 Aug 2018 18:44:05 -0400 Received: from sc9-mailhost3.vmware.com (10.113.161.73) by EX13-EDG-OU-001.vmware.com (10.113.208.155) with Microsoft SMTP Server id 15.0.1156.6; Thu, 9 Aug 2018 13:17:20 -0700 Received: from sc2-haas01-esx0118.eng.vmware.com (sc2-haas01-esx0118.eng.vmware.com [10.172.44.118]) by sc9-mailhost3.vmware.com (Postfix) with ESMTP id 7FD61406F1; Thu, 9 Aug 2018 13:17:37 -0700 (PDT) From: Nadav Amit To: Ingo Molnar CC: , Peter Zijlstra , Thomas Gleixner , , Nadav Amit , Sam Ravnborg , Masahiro Yamada , Michal Marek , "H. Peter Anvin" , Subject: [PATCH v7 02/10] Makefile: Prepare for using macros for inline asm Date: Thu, 9 Aug 2018 13:15:45 -0700 Message-ID: <20180809201554.168804-3-namit@vmware.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180809201554.168804-1-namit@vmware.com> References: <20180809201554.168804-1-namit@vmware.com> MIME-Version: 1.0 Received-SPF: None (EX13-EDG-OU-001.vmware.com: namit@vmware.com does not designate permitted sender hosts) Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Using macros for inline assembly improves both readability and compilation decisions that are distorted by big assembly blocks that use alternative sections. Compile macros.S and use it to assemble all C files. Currently, only x86 will use it. Cc: Sam Ravnborg Cc: Masahiro Yamada Cc: Michal Marek Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: x86@kernel.org Cc: linux-kbuild@vger.kernel.org Acked-by: Peter Zijlstra (Intel) Signed-off-by: Nadav Amit Acked-by: Masahiro Yamada --- Makefile | 9 +++++++-- arch/x86/Makefile | 11 +++++++++-- arch/x86/kernel/macros.S | 7 +++++++ scripts/Kbuild.include | 4 +++- scripts/mod/Makefile | 2 ++ 5 files changed, 28 insertions(+), 5 deletions(-) create mode 100644 arch/x86/kernel/macros.S diff --git a/Makefile b/Makefile index 7a3c4548162b..39d790e74e0d 100644 --- a/Makefile +++ b/Makefile @@ -1051,7 +1051,7 @@ scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ # version.h and scripts_basic is processed / created. # Listed in dependency order -PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 +PHONY += prepare archprepare macroprepare prepare0 prepare1 prepare2 prepare3 # prepare3 is used to check if we are building in a separate output directory, # and if so do: @@ -1075,7 +1075,9 @@ prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ include/config/auto.conf $(cmd_crmodverdir) -archprepare: archheaders archscripts prepare1 scripts_basic +macroprepare: prepare1 archmacros + +archprepare: archheaders archscripts macroprepare scripts_basic prepare0: archprepare gcc-plugins $(Q)$(MAKE) $(build)=. @@ -1143,6 +1145,9 @@ archheaders: PHONY += archscripts archscripts: +PHONY += archmacros +archmacros: + PHONY += __headers __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts $(Q)$(MAKE) $(build)=scripts build_unifdef diff --git a/arch/x86/Makefile b/arch/x86/Makefile index a08e82856563..a4b90ac1629b 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -235,8 +235,8 @@ ifdef CONFIG_X86_64 LDFLAGS += $(call ld-option, -z max-page-size=0x200000) endif -# Speed up the build -KBUILD_CFLAGS += -pipe +# We cannot use -pipe flag since we give an additional .s file to the compiler +#KBUILD_CFLAGS += -pipe # Workaround for a gcc prelease that unfortunately was shipped in a suse release KBUILD_CFLAGS += -Wno-sign-compare # @@ -258,6 +258,13 @@ archscripts: scripts_basic archheaders: $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all +archmacros: + $(Q)$(MAKE) $(build)=arch/x86/kernel arch/x86/kernel/macros.s + +ASM_MACRO_FLAGS = -Wa,arch/x86/kernel/macros.s +export ASM_MACRO_FLAGS +KBUILD_CFLAGS += $(ASM_MACRO_FLAGS) + ### # Kernel objects diff --git a/arch/x86/kernel/macros.S b/arch/x86/kernel/macros.S new file mode 100644 index 000000000000..cfc1c7d1a6eb --- /dev/null +++ b/arch/x86/kernel/macros.S @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * This file includes headers whose assembly part includes macros which are + * commonly used. The macros are precompiled into assmebly file which is later + * assembled together with each compiled file. + */ diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 86321f06461e..d7b7aadb6cd8 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -115,7 +115,9 @@ __cc-option = $(call try-run,\ # Do not attempt to build with gcc plugins during cc-option tests. # (And this uses delayed resolution so the flags will be up to date.) -CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) +# In addition, do not include the asm macros which are built later. +CC_OPTION_FILTERED = $(GCC_PLUGINS_CFLAGS) $(ASM_MACRO_FLAGS) +CC_OPTION_CFLAGS = $(filter-out $(CC_OPTION_FILTERED),$(KBUILD_CFLAGS)) # cc-option # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile index 42c5d50f2bcc..a5b4af47987a 100644 --- a/scripts/mod/Makefile +++ b/scripts/mod/Makefile @@ -4,6 +4,8 @@ OBJECT_FILES_NON_STANDARD := y hostprogs-y := modpost mk_elfconfig always := $(hostprogs-y) empty.o +CFLAGS_REMOVE_empty.o := $(ASM_MACRO_FLAGS) + modpost-objs := modpost.o file2alias.o sumversion.o devicetable-offsets-file := devicetable-offsets.h