2 files changed, 33 insertions, 10 deletions

diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 4e821b3ecb03..b4aeb0f696dc 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -49,6 +49,7 @@
 #include <asm/sstate.h>
 #include <asm/mdesc.h>
 #include <asm/cpudata.h>
+#include <asm/irq.h>
 
 #define MAX_PHYS_ADDRESS        (1UL << 42UL)
 #define KPTE_BITMAP_CHUNK_SZ    (256UL * 1024UL * 1024UL)
@@ -795,6 +796,9 @@ static unsigned long nid_range(unsigned long start, unsigned long end,
                 start += PAGE_SIZE;
         }
 
+        if (start > end)
+                start = end;
+
         return start;
 }
 #else
@@ -1722,8 +1726,7 @@ void __init paging_init(void)
 
         find_ramdisk(phys_base);
 
-        if (cmdline_memory_size)
-                lmb_enforce_memory_limit(phys_base + cmdline_memory_size);
+        lmb_enforce_memory_limit(cmdline_memory_size);
 
         lmb_analyze();
         lmb_dump_all();
@@ -1771,6 +1774,16 @@ void __init paging_init(void)
         if (tlb_type == hypervisor)
                 sun4v_mdesc_init();
 
+        /* 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) {
+                /* XXX Use node local allocations... XXX */
+                softirq_stack[i] = __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
+                hardirq_stack[i] = __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
+        }
+
         /* Setup bootmem... */
         last_valid_pfn = end_pfn = bootmem_init(phys_base);
 
@@ -1950,6 +1963,15 @@ void __init mem_init(void)
 void free_initmem(void)
 {
         unsigned long addr, initend;
+        int do_free = 1;
+
+        /* If the physical memory maps were trimmed by kernel command
+         * line options, don't even try freeing this initmem stuff up.
+         * The kernel image could have been in the trimmed out region
+         * and if so the freeing below will free invalid page structs.
+         */
+        if (cmdline_memory_size)
+                do_free = 0;
 
         /*
          * The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
@@ -1964,13 +1986,16 @@ void free_initmem(void)
                         ((unsigned long) __va(kern_base)) -
                         ((unsigned long) KERNBASE));
                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
-                p = virt_to_page(page);
 
-                ClearPageReserved(p);
-                init_page_count(p);
-                __free_page(p);
-                num_physpages++;
-                totalram_pages++;
+                if (do_free) {
+                        p = virt_to_page(page);
+
+                        ClearPageReserved(p);
+                        init_page_count(p);
+                        __free_page(p);
+                        num_physpages++;
+                        totalram_pages++;
+                }
         }
 }
 
diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S
index ff1dc44d363e..86773e89dc1b 100644
--- a/arch/sparc64/mm/ultra.S
+++ b/arch/sparc64/mm/ultra.S
@@ -480,7 +480,6 @@ xcall_sync_tick:
         b               rtrap_xcall
          ldx            [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
 
-#ifdef CONFIG_MAGIC_SYSRQ
         .globl          xcall_fetch_glob_regs
 xcall_fetch_glob_regs:
         sethi           %hi(global_reg_snapshot), %g1
@@ -511,7 +510,6 @@ xcall_fetch_glob_regs:
         membar          #StoreStore
         stx             %g3, [%g1 + GR_SNAP_THREAD]
         retry
-#endif /* CONFIG_MAGIC_SYSRQ */
 
 #ifdef DCACHE_ALIASING_POSSIBLE
         .align          32