Need help with changing stack size (attn parisc folks)

[Balbir Singh]

I have some legacy code and I think I run into some
kind of stack overflow with it. To verify that, I tried
increasing the stack size from 8K to 16K. I changed
the following files

processor.h
current.h
vmlinux.lds
head.S

The changes were kind of obvious. I know the PARISC guys
have done something similar. Is there something missing
with my changes, since the kernel does not come up,
it is unable to start even kswapd. The diffs have been
include below. Please cc to me in your reply since
I am not hooked onto lkml.

All help appreciated,

Thanks,
Balbir

--- processor.h.org     Wed Feb  6 15:10:37 2002
+++ processor.h Wed Feb  6 15:53:10 2002
@@ -447,9 +447,9 @@
#define KSTK_EIP(tsk)  (((unsigned long *)(4096+(unsigned 
long)(tsk)))[1019])
#define KSTK_ESP(tsk)  (((unsigned long *)(4096+(unsigned 
long)(tsk)))[1022])

-#define THREAD_SIZE (2*PAGE_SIZE)
-#define alloc_task_struct() ((struct task_struct *) 
__get_free_pages(GFP_KERNEL,1))
-#define free_task_struct(p) free_pages((unsigned long) (p), 1)
+#define THREAD_SIZE (4*PAGE_SIZE)
+#define alloc_task_struct() ((struct task_struct *) 
__get_free_pages(GFP_KERNEL,2))
+#define free_task_struct(p) free_pages((unsigned long) (p), 2)
#define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)

#define init_task      (init_task_union.task)

--- current.h.org       Wed Feb  6 15:11:51 2002
+++ current.h   Wed Feb  6 15:52:12 2002
@@ -6,7 +6,7 @@
static inline struct task_struct * get_current(void)
{
        struct task_struct *current;
-       __asm__("andl %%esp,%0; ":"=r" (current) : "0" (~8191UL));
+       __asm__("andl %%esp,%0; ":"=r" (current) : "0" (~(THREAD_SIZE - 
1)));
        return current;
  }

--- vmlinux.lds.org     Wed Feb  6 15:41:07 2002
+++ vmlinux.lds Wed Feb  6 15:41:15 2002
@@ -36,7 +36,7 @@

   _edata = .;                  /* End of data section */

-  . = ALIGN(8192);             /* init_task */
+  . = ALIGN(16384);            /* init_task */
   .data.init_task : { *(.data.init_task) }

   . = ALIGN(4096);             /* Init code and data */

--- head.S.org  Wed Feb  6 16:21:47 2002
+++ head.S      Wed Feb  6 16:22:21 2002
@@ -320,7 +320,7 @@
        ret

ENTRY(stack_start)
-       .long SYMBOL_NAME(init_task_union)+8192
+       .long SYMBOL_NAME(init_task_union)+16384
        .long __KERNEL_DS

/* This is the default interrupt "handler" :-) */

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