pci: increase alignment to make more space for hidden code
Yinghai Lu [Sun, 11 Oct 2009 21:17:16 +0000 (14:17 -0700)]
As reported in

http://bugzilla.kernel.org/show_bug.cgi?id=13940

on some system when acpi are enabled, acpi clears some BAR for some
devices without reason, and kernel will need to allocate devices for
them.  It then apparently hits some undocumented resource conflict,
resulting in non-working devices.

Try to increase alignment to get more safe range for unassigned devices.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/x86/kernel/e820.c

index 85419bb..d17d482 100644 (file)
@@ -1378,8 +1378,8 @@ static unsigned long ram_alignment(resource_size_t pos)
        if (mb < 16)
                return 1024*1024;
 
-       /* To 32MB for anything above that */
-       return 32*1024*1024;
+       /* To 64MB for anything above that */
+       return 64*1024*1024;
 }
 
 #define MAX_RESOURCE_SIZE ((resource_size_t)-1)