From patchwork Mon Sep 25 22:42:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 13398527 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A15DCE79A7 for ; Mon, 25 Sep 2023 22:42:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232611AbjIYWmo (ORCPT ); Mon, 25 Sep 2023 18:42:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229481AbjIYWmn (ORCPT ); Mon, 25 Sep 2023 18:42:43 -0400 Received: from bg4.exmail.qq.com (bg4.exmail.qq.com [43.155.65.254]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42DCD11C; Mon, 25 Sep 2023 15:42:36 -0700 (PDT) X-QQ-mid: bizesmtp62t1695681747tvn9b2gn Received: from linux-lab-host.localdomain ( [116.30.124.152]) by bizesmtp.qq.com (ESMTP) with id ; Tue, 26 Sep 2023 06:42:25 +0800 (CST) X-QQ-SSF: 01200000002000E0Y000B00A0000000 X-QQ-FEAT: QityeSR92A0MQJVv5nuCC9DWB6NqRLzb0Nt00+7+ZdZFXtQd+tI7WSyL9WNOC fnkFG8BxSL4z+x4KtcNrcR8seOIuPOURUulAxrpJmjQqP1LnskZEYIQeAh7TqLbJQrlD4li 3VuACOa9fnkngcsF3KIGbIynUc0D2IWpUdjKYODzIYUXgIz+zmPiduG6OYqUjSeaFRhNVQi R0HbuNW/24Z5vZZir3noOwSkUHoulzJ2+O4FYOOXwupxn1hyjRia4sJ2NT5RJM4nXc0e8Iv 7hAGFtYtbhAxrGb58x8hDMLmYTvcInpLmnftQdn3m6DI7DS6SGVCJU/ULhGp1PpyhutLM3N Q/G4gGWqnZP9rqGdHPsdsDiBO/RURWwjE7Drreilih2jBFRvf5O1ZdfOFTpH5AMIwzf0aLr X-QQ-GoodBg: 0 X-BIZMAIL-ID: 2348411404682298682 From: Zhangjin Wu To: linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, Arnd Bergmann Cc: falcon@tinylab.org, palmer@rivosinc.com, paul.walmsley@sifive.com, paulburton@kernel.org, paulmck@kernel.org, tsbogend@alpha.franken.de, w@1wt.eu, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= , Tim Bird Subject: [PATCH v1 6/7] DCE/DSE: riscv: add HAVE_TRIM_UNUSED_SYSCALLS support Date: Tue, 26 Sep 2023 06:42:23 +0800 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtp:tinylab.org:qybglogicsvrgz:qybglogicsvrgz5a-1 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org For HAVE_TRIM_UNUSED_SYSCALLS, the syscall tables are hacked with the inputing unused_syscalls. Firstly, the intermediate preprocessed .i files are generated from the original C version of syscall tables respectively, and named with a 'used' suffix: syscall_table_used.i, compat_syscall_table_used.i. Secondly, all of the unused syscalls are commented. At last, two new objective files sufixed with 'used' are generated from the hacked .i files and they are linked into the eventual kernel image. Signed-off-by: Zhangjin Wu --- arch/riscv/Kconfig | 1 + arch/riscv/kernel/syscalls/Makefile | 37 +++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d607ab0f7c6d..b5e726b49a6f 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -140,6 +140,7 @@ config RISCV select HAVE_RSEQ select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS + select HAVE_TRIM_UNUSED_SYSCALLS if HAVE_LD_DEAD_CODE_DATA_ELIMINATION select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU select IRQ_DOMAIN select IRQ_FORCED_THREADING diff --git a/arch/riscv/kernel/syscalls/Makefile b/arch/riscv/kernel/syscalls/Makefile index 65abd0871ee5..3b5969aaa9e8 100644 --- a/arch/riscv/kernel/syscalls/Makefile +++ b/arch/riscv/kernel/syscalls/Makefile @@ -3,8 +3,45 @@ # Makefile for the RISC-V syscall tables # +ifndef CONFIG_TRIM_UNUSED_SYSCALLS + CFLAGS_syscall_table.o += $(call cc-option,-Wno-override-init,) CFLAGS_compat_syscall_table.o += $(call cc-option,-Wno-override-init,) obj-y += syscall_table.o obj-$(CONFIG_COMPAT) += compat_syscall_table.o +else # CONFIG_TRIM_UNUSED_SYSCALLS + +include $(srctree)/scripts/Makefile.syscalls + +CFLAGS_syscall_table_used.o += $(call cc-option,-Wno-override-init,) +CFLAGS_compat_syscall_table_used.o += $(call cc-option,-Wno-override-init,) + +obj-y += syscall_table_used.o +obj-$(CONFIG_COMPAT) += compat_syscall_table_used.o + +# comment the unused syscalls +quiet_cmd_used = USED $@ + cmd_used = sed -E -e '/^\[([0-9]+|\([0-9]+ \+ [0-9]+\))\] = /{/= *__riscv_(__sys_|sys_|compat_)*($(used_syscalls)),/!{s%^%/* %g;s%$$% */%g}}' -i $@; + +$(obj)/syscall_table_used.c: $(src)/syscall_table.c + $(Q)cp $< $@ + +$(obj)/syscall_table_used.i: $(src)/syscall_table_used.c $(used_syscalls_deps) FORCE + $(call if_changed_dep,cpp_i_c) + $(call cmd,used) + +$(obj)/syscall_table_used.o: $(obj)/syscall_table_used.i FORCE + $(call if_changed,cc_o_c) + +$(obj)/compat_syscall_table_used.c: $(src)/compat_syscall_table.c + $(Q)cp $< $@ + +$(obj)/compat_syscall_table_used.i: $(src)/compat_syscall_table_used.c $(used_syscalls_deps) FORCE + $(call if_changed_dep,cpp_i_c) + $(call cmd,used) + +$(obj)/compat_syscall_table_used.o: $(obj)/compat_syscall_table_used.i FORCE + $(call if_changed,cc_o_c) + +endif # CONFIG_TRIM_UNUSED_SYSCALLS