powerpc: Fix bug arising from having multiple memory_limit variables

We had a static memory_limit in prom.c, and then another one defined
in setup_64.c and used in numa.c, which resulted in the kernel crashing
when mem=xxx was given on the command line.  This puts the declaration
in system.h and the definition in mem.c.  This also moves the
definition of tce_alloc_start/end out of setup_64.c.

Signed-off-by: Paul Mackerras <paulus@samba.org>

6 files changed, 5 insertions, 16 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 6309a1a17c4a..2eccd0e159e3 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -78,15 +78,13 @@ extern struct rtas_t rtas;
 extern struct lmb lmb;
 extern unsigned long klimit;
 
-static unsigned long memory_limit;
-
 static int __initdata dt_root_addr_cells;
 static int __initdata dt_root_size_cells;
 
 #ifdef CONFIG_PPC64
 static int __initdata iommu_is_off;
 int __initdata iommu_force_on;
-extern unsigned long tce_alloc_start, tce_alloc_end;
+unsigned long tce_alloc_start, tce_alloc_end;
 #endif
 
 typedef u32 cell_t;
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 681537f8ea10..40c48100bf1b 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -631,15 +631,6 @@ static int ppc64_panic_event(struct notifier_block *this,
         return NOTIFY_DONE;
 }
 
-/*
- * These three variables are used to save values passed to us by prom_init()
- * via the device tree. The TCE variables are needed because with a memory_limit
- * in force we may need to explicitly map the TCE are at the top of RAM.
- */
-unsigned long memory_limit;
-unsigned long tce_alloc_start;
-unsigned long tce_alloc_end;
-
 #ifdef CONFIG_PPC_ISERIES
 /*
  * On iSeries we just parse the mem=X option from the command line.
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 3ca331728d21..e43e8ef70088 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -59,6 +59,7 @@
 
 int init_bootmem_done;
 int mem_init_done;
+unsigned long memory_limit;
 
 /*
  * This is called by /dev/mem to know if a given address has to
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index cb864b8f2750..4035cad8d7f1 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -20,6 +20,7 @@
 #include <asm/lmb.h>
 #include <asm/machdep.h>
 #include <asm/abs_addr.h>
+#include <asm/system.h>
 
 static int numa_enabled = 1;
 
@@ -300,7 +301,6 @@ static unsigned long __init numa_enforce_memory_limit(unsigned long start, unsig
          * we've already adjusted it for the limit and it takes care of
          * having memory holes below the limit.
          */
-        extern unsigned long memory_limit;
 
         if (! memory_limit)
                 return size;
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index b27901481782..1544c6f10a38 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -302,8 +302,6 @@ static void __init iSeries_get_cmdline(void)
 
 static void __init iSeries_init_early(void)
 {
-        extern unsigned long memory_limit;
-
         DBG(" -> iSeries_init_early()\n");
 
         ppc64_firmware_features = FW_FEATURE_ISERIES;
diff --git a/arch/ppc64/kernel/prom.c b/arch/ppc64/kernel/prom.c
index cd41a47dd43f..97bfceb5353b 100644
--- a/arch/ppc64/kernel/prom.c
+++ b/arch/ppc64/kernel/prom.c
@@ -83,6 +83,8 @@ static int __initdata dt_root_addr_cells;
 static int __initdata dt_root_size_cells;
 static int __initdata iommu_is_off;
 int __initdata iommu_force_on;
+unsigned long tce_alloc_start, tce_alloc_end;
+
 typedef u32 cell_t;
 
 #if 0
@@ -1063,7 +1065,6 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
 {
         u32 *prop;
         u64 *prop64;
-        extern unsigned long tce_alloc_start, tce_alloc_end;
 
         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);