[PATCH] powerpc: Kdump header cleanup

We need to know the base address of the kdump kernel even when we're not a
kdump kernel, so add a #define for it. Move the logic that sets the kdump
kernelbase into kdump.h instead of page.h.

Rename kdump_setup() to setup_kdump_trampoline() to make it clearer what it's
doing, and add an empty definition for the !CRASH_DUMP case to avoid a

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 764d073..371973b 100644 (file)
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -25,6 +25,11 @@
 #define DBG(fmt...)
 #endif
 
+void reserve_kdump_trampoline(void)
+{
+       lmb_reserve(0, KDUMP_RESERVE_LIMIT);
+}
+
 static void __init create_trampoline(unsigned long addr)
 {
        /* The maximum range of a single instruction branch, is the current
@@ -39,11 +44,11 @@ static void __init create_trampoline(unsigned long addr)
        create_branch(addr + 4, addr + PHYSICAL_START, 0);
 }
 
-void __init kdump_setup(void)
+void __init setup_kdump_trampoline(void)
 {
        unsigned long i;
 
-       DBG(" -> kdump_setup()\n");
+       DBG(" -> setup_kdump_trampoline()\n");
 
        for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
                create_trampoline(i);
@@ -52,7 +57,7 @@ void __init kdump_setup(void)
        create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
        create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
 
-       DBG(" <- kdump_setup()\n");
+       DBG(" <- setup_kdump_trampoline()\n");
 }
 
 #ifdef CONFIG_PROC_VMCORE

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index a04f726..2498afe 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1326,9 +1326,7 @@ void __init early_init_devtree(void *params)
 
        /* Reserve LMB regions used by kernel, initrd, dt, etc... */
        lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
-#ifdef CONFIG_CRASH_DUMP
-       lmb_reserve(0, KDUMP_RESERVE_LIMIT);
-#endif
+       reserve_kdump_trampoline();
        early_reserve_mem();
 
        lmb_enforce_memory_limit(memory_limit);

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 59773d9..78f3a5f 100644 (file)
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -193,9 +193,7 @@ void __init early_setup(unsigned long dt_ptr)
        /* Probe the machine type */
        probe_machine();
 
-#ifdef CONFIG_CRASH_DUMP
-       kdump_setup();
-#endif
+       setup_kdump_trampoline();
 
        DBG("Found, Initializing memory management...\n");
 

diff --git a/include/asm-powerpc/kdump.h b/include/asm-powerpc/kdump.h
index a87aed0..5a5c3b5 100644 (file)
--- a/include/asm-powerpc/kdump.h
+++ b/include/asm-powerpc/kdump.h
@@ -1,13 +1,38 @@
 #ifndef _PPC64_KDUMP_H
 #define _PPC64_KDUMP_H
 
+/* Kdump kernel runs at 32 MB, change at your peril. */
+#define KDUMP_KERNELBASE       0x2000000
+
 /* How many bytes to reserve at zero for kdump. The reserve limit should
- * be greater or equal to the trampoline's end address. */
+ * be greater or equal to the trampoline's end address.
+ * Reserve to the end of the FWNMI area, see head_64.S */
 #define KDUMP_RESERVE_LIMIT    0x8000
 
+#ifdef CONFIG_CRASH_DUMP
+
+#define PHYSICAL_START KDUMP_KERNELBASE
 #define KDUMP_TRAMPOLINE_START 0x0100
 #define KDUMP_TRAMPOLINE_END   0x3000
 
-extern void kdump_setup(void);
+#else /* !CONFIG_CRASH_DUMP */
+
+#define PHYSICAL_START 0x0
+
+#endif /* CONFIG_CRASH_DUMP */
+
+#ifndef __ASSEMBLY__
+#ifdef CONFIG_CRASH_DUMP
+
+extern void reserve_kdump_trampoline(void);
+extern void setup_kdump_trampoline(void);
+
+#else /* !CONFIG_CRASH_DUMP */
+
+static inline void reserve_kdump_trampoline(void) { ; }
+static inline void setup_kdump_trampoline(void) { ; }
+
+#endif /* CONFIG_CRASH_DUMP */
+#endif /* __ASSEMBLY__ */
 
 #endif /* __PPC64_KDUMP_H */

diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h
index 2fbeceb..ae610b6 100644 (file)
--- a/include/asm-powerpc/page.h
+++ b/include/asm-powerpc/page.h
@@ -13,6 +13,7 @@
 #ifdef __KERNEL__
 #include <linux/config.h>
 #include <asm/asm-compat.h>
+#include <asm/kdump.h>
 
 /*
  * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
@@ -52,13 +53,6 @@
  * If you want to test if something's a kernel address, use is_kernel_addr().
  */
 
-#ifdef CONFIG_CRASH_DUMP
-/* Kdump kernel runs at 32 MB, change at your peril. */
-#define PHYSICAL_START 0x2000000
-#else
-#define PHYSICAL_START 0x0
-#endif
-
 #define PAGE_OFFSET     ASM_CONST(CONFIG_KERNEL_START)
 #define KERNELBASE      (PAGE_OFFSET + PHYSICAL_START)