diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/mm/ioremap.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 9f42d7e..7fb6eff 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -42,6 +42,15 @@ int page_is_ram(unsigned long pagenr) unsigned long addr, end; int i; + /* + * A special case is the first 4Kb of memory; + * This is a BIOS owned area, not kernel ram, but generally + * not listed as such in the E820 table. + */ + if (pagenr == 0) + return 0; + + for (i = 0; i < e820.nr_map; i++) { /* * Not usable memory: |