aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/e820_64.c
diff options
context:
space:
mode:
authorYinghai Lu <yhlu.kernel.send@gmail.com>2008-03-18 19:44:19 -0400
committerIngo Molnar <mingo@elte.hu>2008-03-21 12:06:15 -0400
commit5dca6a1bb014875a17289fdaae8c31e0a3641c99 (patch)
treec6cb1eab44e92cedbfcee707de6ed2ad960e20e6 /arch/x86/kernel/e820_64.c
parentfc1c8925c8210009c1fc5d909d189252d8fb4fb2 (diff)
x86: trim mtrr don't close gap for resource allocation.
fix the bug reported here: http://bugzilla.kernel.org/show_bug.cgi?id=10232 use update_memory_range() instead of add_memory_range() directly to avoid closing the gap. ( the new code only affects and runs on systems where the MTRR workaround triggers. ) Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/e820_64.c')
-rw-r--r--arch/x86/kernel/e820_64.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 9f65b4cc323c..9be697126013 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -744,6 +744,33 @@ void __init finish_e820_parsing(void)
744 } 744 }
745} 745}
746 746
747void __init update_memory_range(u64 start, u64 size, unsigned old_type,
748 unsigned new_type)
749{
750 int i;
751
752 BUG_ON(old_type == new_type);
753
754 for (i = 0; i < e820.nr_map; i++) {
755 struct e820entry *ei = &e820.map[i];
756 u64 final_start, final_end;
757 if (ei->type != old_type)
758 continue;
759 /* totally covered? */
760 if (ei->addr >= start && ei->size <= size) {
761 ei->type = new_type;
762 continue;
763 }
764 /* partially covered */
765 final_start = max(start, ei->addr);
766 final_end = min(start + size, ei->addr + ei->size);
767 if (final_start >= final_end)
768 continue;
769 add_memory_region(final_start, final_end - final_start,
770 new_type);
771 }
772}
773
747void __init update_e820(void) 774void __init update_e820(void)
748{ 775{
749 u8 nr_map; 776 u8 nr_map;