linux-kernel - [PATCH-RFC 3/7] powerpc: convert to generic builtin command line

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Date:	Tue,  6 Oct 2015 08:47:10 -0700
From:	Daniel Walker <danielwa@...co.com>
To:	xe-kernel@...ernal.cisco.com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>
Cc:	Daniel Walker <dwalker@...o99.com>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH-RFC 3/7] powerpc: convert to generic builtin command line

This updates the powerpc code to use the CONFIG_GENERIC_CMDLINE
option.

Cc: xe-kernel@...ernal.cisco.com
Cc: Daniel Walker <dwalker@...o99.com>
Signed-off-by: Daniel Walker <danielwa@...co.com>
---
 arch/powerpc/Kconfig            | 23 +----------------------
 arch/powerpc/kernel/prom.c      |  4 ++++
 arch/powerpc/kernel/prom_init.c |  8 ++++----
 3 files changed, 9 insertions(+), 26 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9a7057e..26252dc 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -160,6 +160,7 @@ config PPC
 	select EDAC_ATOMIC_SCRUB
 	select ARCH_HAS_DMA_SET_COHERENT_MASK
 	select HAVE_ARCH_SECCOMP_FILTER
+	select GENERIC_CMDLINE
 
 config GENERIC_CSUM
 	def_bool CPU_LITTLE_ENDIAN
@@ -640,28 +641,6 @@ config PPC_DENORMALISATION
 	  Add support for handling denormalisation of single precision
 	  values.  Useful for bare metal only.  If unsure say Y here.
 
-config CMDLINE_BOOL
-	bool "Default bootloader kernel arguments"
-
-config CMDLINE
-	string "Initial kernel command string"
-	depends on CMDLINE_BOOL
-	default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
-	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.
-
-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.
-
 config EXTRA_TARGETS
 	string "Additional default image types"
 	help
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index bef76c5..3281d5a 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -34,6 +34,7 @@
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
+#include <linux/cmdline.h>
 
 #include <asm/prom.h>
 #include <asm/rtas.h>
@@ -670,6 +671,9 @@ void __init early_init_devtree(void *params)
 	 */
 	of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 
+	/* append and prepend any arguments built into the kernel. */
+	cmdline_add_builtin(boot_command_line, NULL, COMMAND_LINE_SIZE);
+
 	/* Scan memory nodes and rebuild MEMBLOCKs */
 	of_scan_flat_dt(early_init_dt_scan_root, NULL);
 	of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 15099c4..2dd2608 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/initrd.h>
 #include <linux/bitops.h>
+#include <linux/cmdline.h>
 #include <asm/prom.h>
 #include <asm/rtas.h>
 #include <asm/page.h>
@@ -595,11 +596,10 @@ static void __init early_cmdline_parse(void)
 	p = prom_cmd_line;
 	if ((long)prom.chosen > 0)
 		l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
-#ifdef CONFIG_CMDLINE
+
 	if (l <= 0 || p[0] == '\0') /* dbl check */
-		strlcpy(prom_cmd_line,
-			CONFIG_CMDLINE, sizeof(prom_cmd_line));
-#endif /* CONFIG_CMDLINE */
+		cmdline_add_builtin(prom_cmd_line, NULL, sizeof(prom_cmd_line));
+
 	prom_printf("command line: %s\n", prom_cmd_line);
 
 #ifdef CONFIG_PPC64
-- 
2.1.4

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