powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE

The current implementation of CONFIG_RELOCATABLE in BookE is based
on mapping the page aligned kernel load address to KERNELBASE. This
approach however is not enough for platforms, where the TLB page size
is large (e.g, 256M on 44x). So we are renaming the RELOCATABLE used
currently in BookE to DYNAMIC_MEMSTART to reflect the actual method.

The CONFIG_RELOCATABLE for PPC32(BookE) based on processing of the
dynamic relocations will be introduced in the later in the patch series.

This change would allow the use of the old method of RELOCATABLE for
platforms which can afford to enforce the page alignment (platforms with
smaller TLB size).

Changes since v3:

* Introduced a new config, NONSTATIC_KERNEL, to denote a kernel which is
  either a RELOCATABLE or DYNAMIC_MEMSTART(Suggested by: Josh Boyer)

Suggested-by: Scott Wood <scottwood@freescale.com>
Tested-by: Scott Wood <scottwood@freescale.com>

Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Josh Boyer <jwboyer@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux ppc dev <linuxppc-dev@lists.ozlabs.org>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>

5 files changed, 8 insertions, 6 deletions

diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 424afb6b8fba..b3ba5163eae2 100644
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -28,7 +28,7 @@
 #define DBG(fmt...)
 #endif
 
-#ifndef CONFIG_RELOCATABLE
+#ifndef CONFIG_NONSTATIC_KERNEL
 void __init reserve_kdump_trampoline(void)
 {
 	memblock_reserve(0, KDUMP_RESERVE_LIMIT);
@@ -67,7 +67,7 @@ void __init setup_kdump_trampoline(void)
 
 	DBG(" <- setup_kdump_trampoline()\n");
 }
-#endif /* CONFIG_RELOCATABLE */
+#endif /* CONFIG_NONSTATIC_KERNEL */
 
 static int __init parse_savemaxmem(char *p)
 {
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index bb7a9c7a4c05..d7a1debda10b 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -86,8 +86,10 @@ _ENTRY(_start);
 
 	bl	early_init
 
-#ifdef CONFIG_RELOCATABLE
+#ifdef CONFIG_DYNAMIC_MEMSTART
 	/*
+	 * Mapping based, page aligned dynamic kernel loading.
+	 *
 	 * r25 will contain RPN/ERPN for the start address of memory
 	 *
 	 * Add the difference between KERNELBASE and PAGE_OFFSET to the
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 9f5d210ddf3f..d5d78c4ceef6 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -197,7 +197,7 @@ _ENTRY(__early_start)
 
 	bl	early_init
 
-#ifdef CONFIG_RELOCATABLE
+#ifdef CONFIG_DYNAMIC_MEMSTART
 	lis	r3,kernstart_addr@ha
 	la	r3,kernstart_addr@l(r3)
 #ifdef CONFIG_PHYS_64BIT
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index 9ce1672afb59..ec50bb965538 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -128,7 +128,7 @@ void __init reserve_crashkernel(void)
 
 	crash_size = resource_size(&crashk_res);
 
-#ifndef CONFIG_RELOCATABLE
+#ifndef CONFIG_NONSTATIC_KERNEL
 	if (crashk_res.start != KDUMP_KERNELBASE)
 		printk("Crash kernel location must be 0x%x\n",
 				KDUMP_KERNELBASE);
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 55b4080a821e..eca626ea3f23 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2845,7 +2845,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	RELOC(of_platform) = prom_find_machine_type();
 	prom_printf("Detected machine type: %x\n", RELOC(of_platform));
 
-#ifndef CONFIG_RELOCATABLE
+#ifndef CONFIG_NONSTATIC_KERNEL
 	/* Bail if this is a kdump kernel. */
 	if (PHYSICAL_START > 0)
 		prom_panic("Error: You can't boot a kdump kernel from OF!\n");