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authorImre Kaloz <kaloz@openwrt.org>2015-03-31 19:18:03 +0000
committerImre Kaloz <kaloz@openwrt.org>2015-03-31 19:18:03 +0000
commit17fb965d6baadc0ac6d39e7cb89954722f2ea7d2 (patch)
treea51dafb6a89083aa4b33575906e926f3a5caa7ea /target/linux/generic/patches-3.18/995-mangle_bootargs.patch
parentb9c4dadc11e5ddd956d683b9fc97db69598c7c68 (diff)
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generic: add CONFIG_MANGLE_BOOTARGS and disable it by default
Enabling this option renames the bootloader supplied root= and rootfstype= variables, which might have to be know but would break the automatisms OpenWrt uses. Signed-off-by: Imre Kaloz <kaloz@openwrt.org> SVN-Revision: 45196
Diffstat (limited to 'target/linux/generic/patches-3.18/995-mangle_bootargs.patch')
-rw-r--r--target/linux/generic/patches-3.18/995-mangle_bootargs.patch55
1 files changed, 55 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.18/995-mangle_bootargs.patch b/target/linux/generic/patches-3.18/995-mangle_bootargs.patch
new file mode 100644
index 0000000..5d56cf4
--- /dev/null
+++ b/target/linux/generic/patches-3.18/995-mangle_bootargs.patch
@@ -0,0 +1,55 @@
+--- a/init/main.c
++++ b/init/main.c
+@@ -379,6 +379,26 @@ static void __init setup_command_line(ch
+ strcpy(static_command_line, command_line);
+ }
+
++#ifdef CONFIG_MANGLE_BOOTARGS
++static void __init mangle_bootargs(char *command_line)
++{
++ char *rootdev;
++ char *rootfs;
++
++ rootdev = strstr(command_line, "root=/dev/mtdblock");
++ strncpy(rootdev, "mangled_rootblock=", 18);
++
++ rootfs = strstr(command_line, "rootfstype");
++ strncpy(rootfs, "mangled_fs", 10);
++
++}
++#else
++static void __init mangle_bootargs(char *command_line)
++{
++}
++#endif
++
++
+ /*
+ * We need to finalize in a non-__init function or else race conditions
+ * between the root thread and the init thread may cause start_kernel to
+@@ -530,6 +550,7 @@ asmlinkage __visible void __init start_k
+ pr_notice("%s", linux_banner);
+ setup_arch(&command_line);
+ mm_init_cpumask(&init_mm);
++ mangle_bootargs(command_line);
+ setup_command_line(command_line);
+ setup_nr_cpu_ids();
+ setup_per_cpu_areas();
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -1597,6 +1597,15 @@ config EMBEDDED
+ an embedded system so certain expert options are available
+ for configuration.
+
++config MANGLE_BOOTARGS
++ bool "Rename offending bootargs"
++ depends on EXPERT
++ help
++ Sometimes the bootloader passed bogus root= and rootfstype=
++ parameters to the kernel, and while you want to ignore them,
++ you need to know the values f.e. to support dual firmware
++ layouts on the flash.
++
+ config HAVE_PERF_EVENTS
+ bool
+ help