[POWERPC] Add memory regions to the kcore list for 32-bit machines

The entries are only 32-bit, so restrict the virtual address to stay
below 0xffff_ffff.  With KERNELBASE set to 0xc000_0000, this in effect
restricts access to the first 1GB of real memory.

Make setup_kcore conditional on CONFIG_PROC_KCORE for both 32/64.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 39 insertions, 0 deletions

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index d65995ae8273..27c234fb5118 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -255,3 +255,40 @@ void free_initrd_mem(unsigned long start, unsigned long end)
         }
 }
 #endif
+
+#ifdef CONFIG_PROC_KCORE
+static struct kcore_list kcore_vmem;
+
+static int __init setup_kcore(void)
+{
+        int i;
+
+        for (i = 0; i < lmb.memory.cnt; i++) {
+                unsigned long base;
+                unsigned long size;
+                struct kcore_list *kcore_mem;
+
+                base = lmb.memory.region[i].base;
+                size = lmb.memory.region[i].size;
+
+                kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
+                if (!kcore_mem)
+                        panic("%s: kmalloc failed\n", __FUNCTION__);
+
+                /* must stay under 32 bits */
+                if ( 0xfffffffful - (unsigned long)__va(base) < size) {
+                        size = 0xfffffffful - (unsigned long)(__va(base));
+                        printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n",
+                                                size);
+                }
+
+                kclist_add(kcore_mem, __va(base), size);
+        }
+
+        kclist_add(&kcore_vmem, (void *)VMALLOC_START,
+                VMALLOC_END-VMALLOC_START);
+
+        return 0;
+}
+module_init(setup_kcore);
+#endif
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 9f27bb56a61d..fa90f6561b9f 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -113,6 +113,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 }
 #endif
 
+#ifdef CONFIG_PROC_KCORE
 static struct kcore_list kcore_vmem;
 
 static int __init setup_kcore(void)
@@ -139,6 +140,7 @@ static int __init setup_kcore(void)
         return 0;
 }
 module_init(setup_kcore);
+#endif
 
 static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
 {