sparc64: Fix irq stack bootmem allocation.

Currently, irq stack bootmem is allocated for all possible cpus
before nr_cpus value changes the list of possible cpus. As a result,
there is unnecessary wastage of bootmemory.

Move the irq stack bootmem allocation so that it happens after
possible cpu list is modified based on nr_cpus value.

Signed-off-by: Atish Patra <atish.patra@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index f32cfe8..6b7331d 100644 (file)
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -31,6 +31,7 @@
 #include <linux/initrd.h>
 #include <linux/module.h>
 #include <linux/start_kernel.h>
+#include <linux/bootmem.h>
 
 #include <asm/io.h>
 #include <asm/processor.h>
@@ -50,6 +51,8 @@
 #include <asm/elf.h>
 #include <asm/mdesc.h>
 #include <asm/cacheflush.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
 
 #ifdef CONFIG_IP_PNP
 #include <net/ipconfig.h>
@@ -590,6 +593,22 @@ static void __init init_sparc64_elf_hwcap(void)
                pause_patch();
 }
 
+void __init alloc_irqstack_bootmem(void)
+{
+       unsigned int i, node;
+
+       for_each_possible_cpu(i) {
+               node = cpu_to_node(i);
+
+               softirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
+                                                       THREAD_SIZE,
+                                                       THREAD_SIZE, 0);
+               hardirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
+                                                       THREAD_SIZE,
+                                                       THREAD_SIZE, 0);
+       }
+}
+
 void __init setup_arch(char **cmdline_p)
 {
        /* Initialize PROM console and command line. */
@@ -651,6 +670,12 @@ void __init setup_arch(char **cmdline_p)
        paging_init();
        init_sparc64_elf_hwcap();
        smp_fill_in_cpu_possible_map();
+       /*
+        * Once the OF device tree and MDESC have been setup and nr_cpus has
+        * been parsed, we know the list of possible cpus.  Therefore we can
+        * allocate the IRQ stacks.
+        */
+       alloc_irqstack_bootmem();
 }
 
 extern int stop_a_enabled;

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 80031fc..7ac6b62 100644 (file)
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2081,7 +2081,6 @@ void __init paging_init(void)
 {
        unsigned long end_pfn, shift, phys_base;
        unsigned long real_end, i;
-       int node;
 
        setup_page_offset();
 
@@ -2250,21 +2249,6 @@ void __init paging_init(void)
        /* Setup bootmem... */
        last_valid_pfn = end_pfn = bootmem_init(phys_base);
 
-       /* Once the OF device tree and MDESC have been setup, we know
-        * the list of possible cpus.  Therefore we can allocate the
-        * IRQ stacks.
-        */
-       for_each_possible_cpu(i) {
-               node = cpu_to_node(i);
-
-               softirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
-                                                       THREAD_SIZE,
-                                                       THREAD_SIZE, 0);
-               hardirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
-                                                       THREAD_SIZE,
-                                                       THREAD_SIZE, 0);
-       }
-
        kernel_physical_mapping_init();
 
        {