Question about kimage_alloc_page in kexec.c, bug?

[wilbur.chan]

Hi all !

I have a question on kimage_alloc_page:


page = kimage_alloc_pages(gfp_mask, 0);
...

/* If the page cannot be used file it away */
if (page_to_pfn(page) > (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) {
       list_add(&page->lru, &image->unuseable_pages);
       continue;
}


If  a page frame is right at physical address 0x20000000 ,  then when calling

machine_kexec , the following code:

*ptr = (unsigned long) phys_to_virt(*ptr);

will generate an virtual address of 0xa0000000 = 0x20000000+0x80000000 , which

results in physical address 0.



should it be like this?  :

--- kexec.c     2010-08-27 07:47:12.000000000 +0800
+++ kexec.changed.c     2010-10-11 22:04:08.000000000 +0800
@@ -723,7 +723,7 @@
               if (!page)
                       return NULL;
               /* If the page cannot be used file it away */
-               if (page_to_pfn(page) >
+               if (page_to_pfn(page) >=
                               (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) {
                       list_add(&page->lru, &image->unuseable_pages);
                       continue;


Thank you