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From: "Balbir Singh" <balbir_soni@hotmail.com>
To: linux-kernel@vger.kernel.org
Cc: balbir_soni@hotmail.com
Subject: Re: Need help with changing stack size (attn parisc folks)
Date: Wed, 06 Feb 2002 16:57:49 -0800
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I also made changes to lgetuser.S and entry.S, for entries
I missed.

Balbir


>From: "Balbir Singh" <balbir_soni@hotmail.com>
>To: linux-kernel@vger.kernel.org
>CC: balbir_soni@hotmail.com
>Subject: Need help with changing stack size (attn parisc folks)
>Date: Wed, 06 Feb 2002 16:12:12 -0800
>
>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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