From patchwork Fri Apr 2 15:18:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 12180963 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D5D02C001B6 for ; Fri, 2 Apr 2021 15:18:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B184060FD7 for ; Fri, 2 Apr 2021 15:18:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235990AbhDBPS0 (ORCPT ); Fri, 2 Apr 2021 11:18:26 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:21614 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235426AbhDBPSM (ORCPT ); Fri, 2 Apr 2021 11:18:12 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4FBkFq3PhZz9v2lx; Fri, 2 Apr 2021 17:18:07 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id 0PaqD_YmZwDc; Fri, 2 Apr 2021 17:18:07 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4FBkFq2Xz3z9v2ls; Fri, 2 Apr 2021 17:18:07 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 4C7DE8BB79; Fri, 2 Apr 2021 17:18:09 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id raQsvRwETSOo; Fri, 2 Apr 2021 17:18:09 +0200 (CEST) Received: from po16121vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id C09DE8BB7E; Fri, 2 Apr 2021 17:18:08 +0200 (CEST) Received: by po16121vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 9D16267989; Fri, 2 Apr 2021 15:18:08 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v4 07/20] powerpc: Convert to GENERIC_CMDLINE To: will@kernel.org, danielwa@cisco.com, robh@kernel.org, daniel@gimpelevich.san-francisco.ca.us, arnd@kernel.org, akpm@linux-foundation.org Cc: linux-arch@vger.kernel.org, devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, microblaze , linux-mips@vger.kernel.org, nios2 , openrisc@lists.librecores.org, linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-xtensa@linux-xtensa.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org Date: Fri, 2 Apr 2021 15:18:08 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org This updates the powerpc code to use the new cmdline building function. The cmdline_build() defines a temporary string in __initdata. powerpc uses __prombss instead at the moment, so we must call cmdline_build() with destination different from the source to allow GCC to optimise the temporary string out. Signed-off-by: Christophe Leroy --- v4: - Use cmdline_build() instead of __cmdline_build() - Add cmdline_strlcpy() define --- arch/powerpc/Kconfig | 37 +-------------------------------- arch/powerpc/kernel/prom_init.c | 21 +++++++++---------- 2 files changed, 11 insertions(+), 47 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c1344c05226c..6723f10ac246 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -168,6 +168,7 @@ config PPC select EDAC_SUPPORT select GENERIC_ATOMIC64 if PPC32 select GENERIC_CLOCKEVENTS_BROADCAST if SMP + select GENERIC_CMDLINE select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC @@ -888,42 +889,6 @@ config PPC_DENORMALISATION Add support for handling denormalisation of single precision values. Useful for bare metal only. If unsure say Y here. -config CMDLINE - string "Initial kernel command string" - default "" - help - On some platforms, there is currently no way for the boot loader to - pass arguments to the kernel. For these platforms, you can supply - some command-line options at build time by entering them here. In - most cases you will need to specify the root device here. - -choice - prompt "Kernel command line type" if CMDLINE != "" - default CMDLINE_FROM_BOOTLOADER - -config CMDLINE_FROM_BOOTLOADER - bool "Use bootloader kernel arguments if available" - help - Uses the command-line options passed by the boot loader. If - the boot loader doesn't provide any, the default kernel command - string provided in CMDLINE will be used. - -config CMDLINE_EXTEND - bool "Extend bootloader kernel arguments" - help - The command-line arguments provided by the boot loader will be - appended to the default kernel command string. - -config CMDLINE_FORCE - bool "Always use the default kernel command string" - help - Always use the default kernel command string, even if the boot - loader passes other arguments to the kernel. - This is useful if you cannot or don't want to change the - command-line options your boot loader passes to the kernel. - -endchoice - config EXTRA_TARGETS string "Additional default image types" help diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 33316ee55265..704afd028213 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -152,7 +152,7 @@ static struct prom_t __prombss prom; static unsigned long __prombss prom_entry; static char __prombss of_stdout_device[256]; -static char __prombss prom_scratch[256]; +static char __prombss prom_scratch[COMMAND_LINE_SIZE]; static unsigned long __prombss dt_header_start; static unsigned long __prombss dt_struct_start, dt_struct_end; @@ -770,24 +770,23 @@ static unsigned long prom_memparse(const char *ptr, const char **retptr) * Early parsing of the command line passed to the kernel, used for * "mem=x" and the options that affect the iommu */ +#define cmdline_strlcat prom_strlcat +#define cmdline_strlcpy prom_strlcpy +#include + static void __init early_cmdline_parse(void) { const char *opt; - - char *p; int l = 0; - - prom_cmd_line[0] = 0; - p = prom_cmd_line; + bool truncated; if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0) - l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1); + l = prom_getprop(prom.chosen, "bootargs", prom_scratch, + COMMAND_LINE_SIZE - 1); - if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0') - prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE, - sizeof(prom_cmd_line)); + truncated = !__cmdline_build(prom_cmd_line, l > 0 ? prom_scratch : NULL); - prom_printf("command line: %s\n", prom_cmd_line); + prom_printf("command line: %s %s\n", prom_cmd_line, truncated ? "[truncated]" : ""); #ifdef CONFIG_PPC64 opt = prom_strstr(prom_cmd_line, "iommu=");