1 files changed, 21 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 36f6779c88d4..5112a4aa801d 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -16,6 +16,7 @@
 #include <linux/root_dev.h>
 #include <linux/cpu.h>
 #include <linux/console.h>
+#include <linux/lmb.h>
 
 #include <asm/io.h>
 #include <asm/prom.h>
@@ -229,6 +230,24 @@ int __init ppc_init(void)
 
 arch_initcall(ppc_init);
 
+#ifdef CONFIG_IRQSTACKS
+static void __init irqstack_early_init(void)
+{
+        unsigned int i;
+
+        /* interrupt stacks must be in lowmem, we get that for free on ppc32
+         * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
+        for_each_possible_cpu(i) {
+                softirq_ctx[i] = (struct thread_info *)
+                        __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
+                hardirq_ctx[i] = (struct thread_info *)
+                        __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
+        }
+}
+#else
+#define irqstack_early_init()
+#endif
+
 /* Warning, IO base is not yet inited */
 void __init setup_arch(char **cmdline_p)
 {
@@ -286,6 +305,8 @@ void __init setup_arch(char **cmdline_p)
         init_mm.end_data = (unsigned long) _edata;
         init_mm.brk = klimit;
 
+        irqstack_early_init();
+
         /* set up the bootmem stuff with available memory */
         do_init_bootmem();
         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);