generic: add linux 4.1 support

Boot tested: http://pastebin.com/L6aAb9xj

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jogo:
  update to 4.1 final
  add patches added since submission
  delete patches applied in later rcs
  restore commit messages in 220-gc-sections and 304-mips_disable_fpu
  fix 050-backport_netfilter_rtcache to match new API
  update inlined dma ops with upstream changes
  add missing config symbols
  enabled CONFIG_MULTIUSER
  update kmod defintions for 4.1
]
Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 46112

target/linux/generic/patches-4.1/995-mangle_bootargs.patch

@@ -0,0 +1,58 @@
+--- a/init/main.c
++++ b/init/main.c
+@@ -352,6 +352,29 @@ static inline void setup_nr_cpu_ids(void
+ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
+ #endif
+ 
++#ifdef CONFIG_MANGLE_BOOTARGS
++static void __init mangle_bootargs(char *command_line)
++{
++	char *rootdev;
++	char *rootfs;
++
++	rootdev = strstr(command_line, "root=/dev/mtdblock");
++
++	if (rootdev)
++		strncpy(rootdev, "mangled_rootblock=", 18);
++
++	rootfs = strstr(command_line, "rootfstype");
++
++	if (rootfs)
++		strncpy(rootfs, "mangled_fs", 10);
++
++}
++#else
++static void __init mangle_bootargs(char *command_line)
++{
++}
++#endif
++
+ /*
+  * We need to store the untouched command line for future reference.
+  * We also need to store the touched command line since the parameter
+@@ -522,6 +545,7 @@ 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
+@@ -1607,6 +1607,15 @@ 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