[POWERPC] Limit range of __init_ref_ok somewhat

This patch introduces zalloc_maybe_bootmem and uses it so that we don't
have to mark a whole (largish) routine as __init_ref_ok.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 18 insertions, 8 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 0e47c8cfc979..151b13119208 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -424,7 +424,7 @@ static int default_irq_host_match(struct irq_host *h, struct device_node *np)
         return h->of_node != NULL && h->of_node == np;
 }
 
-__init_refok struct irq_host *irq_alloc_host(struct device_node *of_node,
+struct irq_host *irq_alloc_host(struct device_node *of_node,
                                 unsigned int revmap_type,
                                 unsigned int revmap_arg,
                                 struct irq_host_ops *ops,
@@ -439,13 +439,7 @@ __init_refok struct irq_host *irq_alloc_host(struct device_node *of_node,
         /* Allocate structure and revmap table if using linear mapping */
         if (revmap_type == IRQ_HOST_MAP_LINEAR)
                 size += revmap_arg * sizeof(unsigned int);
-        if (mem_init_done)
-                host = kzalloc(size, GFP_KERNEL);
-        else {
-                host = alloc_bootmem(size);
-                if (host)
-                        memset(host, 0, size);
-        }
+        host = zalloc_maybe_bootmem(size, GFP_KERNEL);
         if (host == NULL)
                 return NULL;
 
diff --git a/arch/powerpc/lib/alloc.c b/arch/powerpc/lib/alloc.c
index e58c80590ebc..f53e09c7dac7 100644
--- a/arch/powerpc/lib/alloc.c
+++ b/arch/powerpc/lib/alloc.c
@@ -2,6 +2,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/bootmem.h>
+#include <linux/string.h>
 
 #include <asm/system.h>
 
@@ -12,3 +13,17 @@ void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
         else
                 return alloc_bootmem(size);
 }
+
+void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
+{
+        void *p;
+
+        if (mem_init_done)
+                p = kzalloc(size, mask);
+        else {
+                p = alloc_bootmem(size);
+                if (p)
+                        memset(p, 0, size);
+        }
+        return p;
+}
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index f7879fc530f1..d10e99bf5001 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -190,6 +190,7 @@ extern unsigned long memory_limit;
 extern unsigned long klimit;
 
 extern void *alloc_maybe_bootmem(size_t size, gfp_t mask);
+extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
 
 extern int powersave_nap;       /* set if nap mode can be used in idle loop */