ramoops: Move to fs/pstore/ram.c

Since ramoops was converted to pstore, it has nothing to do with character
devices nowadays. Instead, today it is just a RAM backend for pstore.

The patch just moves things around. There are a few changes were needed
because of the move:

1. Kconfig and Makefiles fixups, of course.

2. In pstore/ram.c we have to play a bit with MODULE_PARAM_PREFIX, this
   is needed to keep user experience the same as with ramoops driver
   (i.e. so that ramoops.foo kernel command line arguments would still
   work).

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Marco Stornelli <marco.stornelli@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ramoops.txt

@@ -38,7 +38,7 @@ Setting the ramoops parameters can be done in 2 different manners:
  2. Use a platform device and set the platform data. The parameters can then
  be set through that platform data. An example of doing that is:
 
-#include <linux/ramoops.h>
+#include <linux/pstore_ram.h>
 [...]
 
 static struct ramoops_platform_data ramoops_data = {

drivers/char/Kconfig

@@ -585,15 +585,6 @@ config DEVPORT
 
 source "drivers/s390/char/Kconfig"
 
-config RAMOOPS
-	tristate "Log panic/oops to a RAM buffer"
-	depends on HAS_IOMEM
-	depends on PSTORE
-	default n
-	help
-	  This enables panic and oops messages to be logged to a circular
-	  buffer in RAM where it can be read back at some later point.
-
 config MSM_SMD_PKT
 	bool "Enable device interface for some SMD packet ports"
 	default n

drivers/char/Makefile

@@ -58,7 +58,6 @@ obj-$(CONFIG_HANGCHECK_TIMER)	+= hangcheck-timer.o
 obj-$(CONFIG_TCG_TPM)		+= tpm/
 
 obj-$(CONFIG_PS3_FLASH)		+= ps3flash.o
-obj-$(CONFIG_RAMOOPS)		+= ramoops.o
 
 obj-$(CONFIG_JS_RTC)		+= js-rtc.o
 js-rtc-y = rtc.o

fs/pstore/Kconfig

@@ -11,3 +11,17 @@ config PSTORE
 	   (e.g. ACPI_APEI on X86) which will select this for you.
 	   If you don't have a platform persistent store driver,
 	   say N.
+
+config PSTORE_RAM
+	tristate "Log panic/oops to a RAM buffer"
+	depends on HAS_IOMEM
+	depends on PSTORE
+	default n
+	help
+	  This enables panic and oops messages to be logged to a circular
+	  buffer in RAM where it can be read back at some later point.
+
+	  Note that for historical reasons, the module will be named
+	  "ramoops.ko".
+
+	  For more information, see Documentation/ramoops.txt.

fs/pstore/Makefile

@@ -5,3 +5,6 @@
 obj-y += pstore.o
 
 pstore-objs += inode.o platform.o
+
+ramoops-objs += ram.o
+obj-$(CONFIG_PSTORE_RAM)	+= ramoops.o

drivers/char/ramoops.c → fs/pstore/ram.c

@@ -31,7 +31,7 @@
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
-#include <linux/ramoops.h>
+#include <linux/pstore_ram.h>
 
 #define RAMOOPS_KERNMSG_HDR "===="
 #define MIN_MEM_SIZE 4096UL

include/linux/ramoops.h → include/linux/pstore_ram.h

@@ -1,5 +1,5 @@
-#ifndef __RAMOOPS_H
-#define __RAMOOPS_H
+#ifndef __LINUX_PSTORE_RAM_H__
+#define __LINUX_PSTORE_RAM_H__
 
 /*
  * Ramoops platform data