lkml.org 
[lkml]   [2019]   [Aug]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3] powerpc: Support CMDLINE_EXTEND
Date
Bring powerpc in line with other architectures that support extending or
overriding the bootloader provided command line.

The current behaviour is most like CMDLINE_FROM_BOOTLOADER where the
bootloader command line is preferred but the kernel config can provide a
fallback so CMDLINE_FROM_BOOTLOADER is the default. CMDLINE_EXTEND can
be used to append the CMDLINE from the kernel config to the one provided
by the bootloader.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---
Changes in v3:
- don't use BUG_ON in prom_strlcat
- rearrange things to eliminate prom_strlcpy

Changes in v2:
- incorporate ideas from Christope's patch https://patchwork.ozlabs.org/patch/1074126/
- support CMDLINE_FORCE

arch/powerpc/Kconfig | 20 +++++++++++++++++-
arch/powerpc/kernel/prom_init.c | 36 ++++++++++++++++++++++-----------
2 files changed, 43 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 77f6ebf97113..d413fe1b4058 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -852,15 +852,33 @@ config CMDLINE
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"
- depends on CMDLINE_BOOL
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 514707ef6779..1c7010cc6ec9 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -298,16 +298,24 @@ static char __init *prom_strstr(const char *s1, const char *s2)
return NULL;
}

-static size_t __init prom_strlcpy(char *dest, const char *src, size_t size)
-{
- size_t ret = prom_strlen(src);
+static size_t __init prom_strlcat(char *dest, const char *src, size_t count)
+{
+ size_t dsize = prom_strlen(dest);
+ size_t len = prom_strlen(src);
+ size_t res = dsize + len;
+
+ /* This would be a bug */
+ if (dsize >= count)
+ return count;
+
+ dest += dsize;
+ count -= dsize;
+ if (len >= count)
+ len = count-1;
+ memcpy(dest, src, len);
+ dest[len] = 0;
+ return res;

- if (size) {
- size_t len = (ret >= size) ? size - 1 : ret;
- memcpy(dest, src, len);
- dest[len] = '\0';
- }
- return ret;
}

#ifdef CONFIG_PPC_PSERIES
@@ -759,10 +767,14 @@ static void __init early_cmdline_parse(void)

prom_cmd_line[0] = 0;
p = prom_cmd_line;
- if ((long)prom.chosen > 0)
+
+ if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0)
l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
- if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && (l <= 0 || p[0] == '\0')) /* dbl check */
- prom_strlcpy(prom_cmd_line, CONFIG_CMDLINE, sizeof(prom_cmd_line));
+
+ if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0')
+ prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE,
+ sizeof(prom_cmd_line));
+
prom_printf("command line: %s\n", prom_cmd_line);

#ifdef CONFIG_PPC64
--
2.22.0
\
 
 \ /
  Last update: 2019-08-02 00:50    [W:0.103 / U:1.948 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site