[PATCH] [POWERPC] Clean up some linker and symbol usage

[Kumar Gala <galak@kernel.crashing.org>]

* use _stext and _end sybmols when reserving kernel text in the lmb.  Use
  of these symbols is a bit more robust way to determine the physical start
  and size of the kernel text.
* PAGE_OFFSET is not always the start of code, use _stext instead.
* grab PAGE_SIZE and KERNELBASE from asm/page.h like ppc64 does.  Makes the
  code a bit more common and provide a single place to manipulate the defines
  for things like kdump.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/kernel/prom.c        |    2 +-
 arch/powerpc/kernel/setup_32.c    |    2 +-
 arch/powerpc/kernel/setup_64.c    |    2 +-
 arch/powerpc/kernel/vmlinux.lds.S |    4 +---
 4 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 9330920..60ef7d1 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1124,7 +1124,7 @@ void __init early_init_devtree(void *params)
 	parse_early_param();

 	/* Reserve LMB regions used by kernel, initrd, dt, etc... */
-	lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
+	lmb_reserve(__pa(_stext), _end - _stext);
 	reserve_kdump_trampoline();
 	reserve_crashkernel();
 	early_reserve_mem();
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index cd870a8..b0989ca 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -277,7 +277,7 @@ void __init setup_arch(char **cmdline_p)
 	if (ppc_md.panic)
 		setup_panic();

-	init_mm.start_code = PAGE_OFFSET;
+	init_mm.start_code = (unsigned long)_stext;
 	init_mm.end_code = (unsigned long) _etext;
 	init_mm.end_data = (unsigned long) _edata;
 	init_mm.brk = klimit;
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 2c2d831..0205d40 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -510,7 +510,7 @@ void __init setup_arch(char **cmdline_p)
 	if (ppc_md.panic)
 		setup_panic();

-	init_mm.start_code = PAGE_OFFSET;
+	init_mm.start_code = (unsigned long)_stext;
 	init_mm.end_code = (unsigned long) _etext;
 	init_mm.end_data = (unsigned long) _edata;
 	init_mm.brk = klimit;
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 0afb9e3..b5a76bc 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -1,11 +1,9 @@
 #ifdef CONFIG_PPC64
-#include <asm/page.h>
 #define PROVIDE32(x)	PROVIDE(__unused__##x)
 #else
-#define PAGE_SIZE	4096
-#define KERNELBASE	CONFIG_KERNEL_START
 #define PROVIDE32(x)	PROVIDE(x)
 #endif
+#include <asm/page.h>
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>

-- 
1.5.4.1