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[23.128.96.18]) by mx.google.com with ESMTP id c11si8888524edv.591.2021.03.09.00.00.05; Tue, 09 Mar 2021 00:00:28 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229607AbhCIH47 (ORCPT + 99 others); Tue, 9 Mar 2021 02:56:59 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:21195 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229681AbhCIH4v (ORCPT ); Tue, 9 Mar 2021 02:56:51 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4Dvnbh1xgVz9txlX; Tue, 9 Mar 2021 08:56:48 +0100 (CET) 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 w6xYnDel4M2J; Tue, 9 Mar 2021 08:56:48 +0100 (CET) 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 4Dvnbh0qTtz9txlW; Tue, 9 Mar 2021 08:56:48 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 2035B8B7CE; Tue, 9 Mar 2021 08:56:49 +0100 (CET) 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 ebcmzNe1X4b6; Tue, 9 Mar 2021 08:56:49 +0100 (CET) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 340548B773; Tue, 9 Mar 2021 08:56:48 +0100 (CET) Subject: Re: [PATCH v2 4/7] CMDLINE: powerpc: convert to generic builtin command line To: Daniel Walker , Will Deacon , Rob Herring , Daniel Gimpelevich , Andrew Morton , x86@kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, xe-linux-external@cisco.com, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras Cc: Ruslan Ruslichenko , Ruslan Bilovol , linux-kernel@vger.kernel.org References: <20210309000247.2989531-5-danielwa@cisco.com> From: Christophe Leroy Message-ID: Date: Tue, 9 Mar 2021 08:56:47 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210309000247.2989531-5-danielwa@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 09/03/2021 à 01:02, Daniel Walker a écrit : > This updates the powerpc code to use the CONFIG_GENERIC_CMDLINE > option. > > Cc: xe-linux-external@cisco.com > Signed-off-by: Ruslan Ruslichenko > Signed-off-by: Ruslan Bilovol > Signed-off-by: Daniel Walker > --- > arch/powerpc/Kconfig | 37 +-------------------------------- > arch/powerpc/kernel/prom.c | 1 + > arch/powerpc/kernel/prom_init.c | 35 ++++++++++++++++++------------- > 3 files changed, 23 insertions(+), 50 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 107bb4319e0e..276b06d5c961 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -167,6 +167,7 @@ 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 > @@ -906,42 +907,6 @@ 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.c b/arch/powerpc/kernel/prom.c > index ae3c41730367..96d0a01be1b4 100644 > --- a/arch/powerpc/kernel/prom.c > +++ b/arch/powerpc/kernel/prom.c > @@ -27,6 +27,7 @@ > #include > #include > #include > +#include Why is this needed in prom.c ? > #include > #include > #include > diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c > index e9d4eb6144e1..657241534d69 100644 > --- a/arch/powerpc/kernel/prom_init.c > +++ b/arch/powerpc/kernel/prom_init.c > @@ -27,6 +27,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -242,15 +243,6 @@ static int __init prom_strcmp(const char *cs, const char *ct) > return 0; > } > > -static char __init *prom_strcpy(char *dest, const char *src) > -{ > - char *tmp = dest; > - > - while ((*dest++ = *src++) != '\0') > - /* nothing */; > - return tmp; > -} > - This game with prom_strcpy() should go a separate preceeding patch. Also, it looks like checkpatch.pl recommends to use strscpy() instead of strlcpy(). > static int __init prom_strncmp(const char *cs, const char *ct, size_t count) > { > unsigned char c1, c2; > @@ -276,6 +268,20 @@ static size_t __init prom_strlen(const char *s) > return sc - s; > } > > +static size_t __init prom_strlcpy(char *dest, const char *src, size_t size) > +{ > + size_t ret = prom_strlen(src); > + > + if (size) { > + size_t len = (ret >= size) ? size - 1 : ret; > + > + memcpy(dest, src, len); > + dest[len] = '\0'; > + } > + return ret; > +} > + > + > static int __init prom_memcmp(const void *cs, const void *ct, size_t count) > { > const unsigned char *su1, *su2; > @@ -304,6 +310,7 @@ static char __init *prom_strstr(const char *s1, const char *s2) > return NULL; > } > > +#ifdef GENERIC_CMDLINE_NEED_STRLCAT > static size_t __init prom_strlcat(char *dest, const char *src, size_t count) > { > size_t dsize = prom_strlen(dest); > @@ -323,6 +330,7 @@ static size_t __init prom_strlcat(char *dest, const char *src, size_t count) > return res; > > } > +#endif > > #ifdef CONFIG_PPC_PSERIES > static int __init prom_strtobool(const char *s, bool *res) > @@ -775,12 +783,11 @@ static void __init early_cmdline_parse(void) > prom_cmd_line[0] = 0; > p = prom_cmd_line; > > - if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0) > + if ((long)prom.chosen > 0) > l = prom_getprop(prom.chosen, "bootargs", p, 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)); > + cmdline_add_builtin_custom(prom_cmd_line, (l > 0 ? p : NULL), sizeof(prom_cmd_line), > + __prombss, prom_strlcpy, prom_strlcat); So we are referencing a function that doesn't exist (namely prom_strlcat). But it works because cmdline_add_builtin_custom() looks like a function but is in fact an obscure macro that doesn't use prom_strlcat() unless GENERIC_CMDLINE_NEED_STRLCAT is defined. IMHO that's awful for readability and code maintenance. > > prom_printf("command line: %s\n", prom_cmd_line); > > @@ -2706,7 +2713,7 @@ static void __init flatten_device_tree(void) > > /* Add "phandle" in there, we'll need it */ > namep = make_room(&mem_start, &mem_end, 16, 1); > - prom_strcpy(namep, "phandle"); > + prom_strlcpy(namep, "phandle", 8); Should be in a separate patch. > mem_start = (unsigned long)namep + prom_strlen(namep) + 1; > > /* Build string array */ > Christophe