1 GB lowmem

[Rune Torgersen]

Kumar Gala wrote:
> On May 21, 2008, at 3:55 PM, Rune Torgersen wrote:
>> Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x80000000. Now it
>> works in both vaniulla an d RT kernel.
> 
> We should really add some sanity check on CONFIG_TASK_SIZE vs
> KERNEL_START. 

Something like this?
Wording sould probablyy be a bit different/cleare.

diff --git a/include/asm-powerpc/processor.h
b/include/asm-powerpc/processor.h
index fd98ca9..72e0e3f 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec;
 extern struct task_struct *last_task_used_spe;

 #ifdef CONFIG_PPC32
+
+#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
+#error User TASK_SIZE overlaps with KERNEL_START address
+#endif
 #define TASK_SIZE      (CONFIG_TASK_SIZE)

 /* This decides where the kernel will search for a free chunk of vm