xtensa: don't pass high memory to bootmem allocator

This fixes panic when booting on machine with more than 128M memory
passed from the bootloader.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 479d753..aff108d 100644 (file)
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -90,7 +90,7 @@ int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
 
 
 /*
- * Initialize the bootmem system and give it all the memory we have available.
+ * Initialize the bootmem system and give it all low memory we have available.
  */
 
 void __init bootmem_init(void)
@@ -142,9 +142,14 @@ void __init bootmem_init(void)
 
        /* Add all remaining memory pieces into the bootmem map */
 
-       for (i=0; i<sysmem.nr_banks; i++)
-               free_bootmem(sysmem.bank[i].start,
-                            sysmem.bank[i].end - sysmem.bank[i].start);
+       for (i = 0; i < sysmem.nr_banks; i++) {
+               if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) {
+                       unsigned long end = min(max_low_pfn << PAGE_SHIFT,
+                                               sysmem.bank[i].end);
+                       free_bootmem(sysmem.bank[i].start,
+                                    end - sysmem.bank[i].start);
+               }
+       }
 
 }