--- /dev/null
+Index: kernel-2.4.21/arch/i386/kernel/entry.S
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/kernel/entry.S 2003-06-13 07:51:29.000000000 -0700
++++ kernel-2.4.21/arch/i386/kernel/entry.S 2003-12-04 11:57:01.000000000 -0800
+@@ -45,6 +45,7 @@
+ #include <linux/linkage.h>
+ #include <asm/segment.h>
+ #include <asm/smp.h>
++#include <asm/current.h>
+
+ EBX = 0x00
+ ECX = 0x04
+@@ -130,10 +131,6 @@
+ .long 3b,6b; \
+ .previous
+
+-#define GET_CURRENT(reg) \
+- movl $-8192, reg; \
+- andl %esp, reg
+-
+ ENTRY(lcall7)
+ pushfl # We get a different stack layout with call gates,
+ pushl %eax # which has to be cleaned up later..
+@@ -149,7 +146,7 @@
+ movl %ecx,CS(%esp) #
+ movl %esp,%ebx
+ pushl %ebx
+- andl $-8192,%ebx # GET_CURRENT
++ andl $-THREAD_SIZE,%ebx # GET_CURRENT
+ movl exec_domain(%ebx),%edx # Get the execution domain
+ movl 4(%edx),%edx # Get the lcall7 handler for the domain
+ pushl $0x7
+@@ -173,7 +170,7 @@
+ movl %ecx,CS(%esp) #
+ movl %esp,%ebx
+ pushl %ebx
+- andl $-8192,%ebx # GET_CURRENT
++ andl $-THREAD_SIZE,%ebx # GET_CURRENT
+ movl exec_domain(%ebx),%edx # Get the execution domain
+ movl 4(%edx),%edx # Get the lcall7 handler for the domain
+ pushl $0x27
+Index: kernel-2.4.21/arch/i386/kernel/smpboot.c
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/kernel/smpboot.c 2003-06-13 07:51:29.000000000 -0700
++++ kernel-2.4.21/arch/i386/kernel/smpboot.c 2003-12-04 11:57:01.000000000 -0800
+@@ -819,7 +819,7 @@
+
+ /* So we see what's up */
+ printk("Booting processor %d/%d eip %lx\n", cpu, apicid, start_eip);
+- stack_start.esp = (void *) (1024 + PAGE_SIZE + (char *)idle);
++ stack_start.esp = (void *)idle->thread.esp;
+
+ /*
+ * This grunge runs the startup process for
+@@ -892,7 +892,7 @@
+ Dprintk("CPU has booted.\n");
+ } else {
+ boot_error= 1;
+- if (*((volatile unsigned char *)phys_to_virt(8192))
++ if (*((volatile unsigned char *)phys_to_virt(THREAD_SIZE))
+ == 0xA5)
+ /* trampoline started but...? */
+ printk("Stuck ??\n");
+@@ -915,7 +915,7 @@
+ }
+
+ /* mark "stuck" area as not stuck */
+- *((volatile unsigned long *)phys_to_virt(8192)) = 0;
++ *((volatile unsigned long *)phys_to_virt(THREAD_SIZE)) = 0;
+
+ if(clustered_apic_mode == CLUSTERED_APIC_NUMAQ) {
+ printk("Restoring NMI vector\n");
+Index: kernel-2.4.21/arch/i386/kernel/traps.c
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/kernel/traps.c 2002-11-28 15:53:09.000000000 -0800
++++ kernel-2.4.21/arch/i386/kernel/traps.c 2003-12-04 11:57:01.000000000 -0800
+@@ -158,7 +158,7 @@
+ unsigned long esp = tsk->thread.esp;
+
+ /* User space on another CPU? */
+- if ((esp ^ (unsigned long)tsk) & (PAGE_MASK<<1))
++ if ((esp ^ (unsigned long)tsk) & ~(THREAD_SIZE - 1))
+ return;
+ show_trace((unsigned long *)esp);
+ }
+Index: kernel-2.4.21/arch/i386/kernel/head.S
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/kernel/head.S 2003-06-13 07:51:29.000000000 -0700
++++ kernel-2.4.21/arch/i386/kernel/head.S 2003-12-04 11:57:01.000000000 -0800
+@@ -15,6 +15,7 @@
+ #include <asm/page.h>
+ #include <asm/pgtable.h>
+ #include <asm/desc.h>
++#include <asm/current.h>
+
+ #define OLD_CL_MAGIC_ADDR 0x90020
+ #define OLD_CL_MAGIC 0xA33F
+@@ -320,7 +321,7 @@
+ ret
+
+ ENTRY(stack_start)
+- .long SYMBOL_NAME(init_task_union)+8192
++ .long SYMBOL_NAME(init_task_union)+THREAD_SIZE
+ .long __KERNEL_DS
+
+ /* This is the default interrupt "handler" :-) */
+Index: kernel-2.4.21/arch/i386/kernel/irq.c
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/kernel/irq.c 2002-11-28 15:53:09.000000000 -0800
++++ kernel-2.4.21/arch/i386/kernel/irq.c 2003-12-04 11:57:01.000000000 -0800
+@@ -581,7 +581,10 @@
+ long esp;
+
+ /* Debugging check for stack overflow: is there less than 1KB free? */
+- __asm__ __volatile__("andl %%esp,%0" : "=r" (esp) : "0" (8191));
++ __asm__ __volatile__(
++ "andl %%esp,%0"
++ : "=r" (esp) : "0" (THREAD_SIZE-1));
++
+ if (unlikely(esp < (sizeof(struct task_struct) + 1024))) {
+ extern void show_stack(unsigned long *);
+
+Index: kernel-2.4.21/arch/i386/lib/getuser.S
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/lib/getuser.S 1998-01-12 13:42:52.000000000 -0800
++++ kernel-2.4.21/arch/i386/lib/getuser.S 2003-12-04 11:57:01.000000000 -0800
+@@ -21,6 +21,10 @@
+ * as they get called from within inline assembly.
+ */
+
++/* Duplicated from asm/processor.h */
++#include <asm/current.h>
++#include <linux/config.h>
++
+ addr_limit = 12
+
+ .text
+@@ -28,7 +32,7 @@
+ .globl __get_user_1
+ __get_user_1:
+ movl %esp,%edx
+- andl $0xffffe000,%edx
++ andl $~(THREAD_SIZE - 1),%edx
+ cmpl addr_limit(%edx),%eax
+ jae bad_get_user
+ 1: movzbl (%eax),%edx
+@@ -41,7 +45,7 @@
+ addl $1,%eax
+ movl %esp,%edx
+ jc bad_get_user
+- andl $0xffffe000,%edx
++ andl $~(THREAD_SIZE - 1),%edx
+ cmpl addr_limit(%edx),%eax
+ jae bad_get_user
+ 2: movzwl -1(%eax),%edx
+@@ -54,7 +58,7 @@
+ addl $3,%eax
+ movl %esp,%edx
+ jc bad_get_user
+- andl $0xffffe000,%edx
++ andl $~(THREAD_SIZE - 1),%edx
+ cmpl addr_limit(%edx),%eax
+ jae bad_get_user
+ 3: movl -3(%eax),%edx
+Index: kernel-2.4.21/arch/i386/config.in
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/config.in 2003-06-13 07:51:29.000000000 -0700
++++ kernel-2.4.21/arch/i386/config.in 2003-12-04 11:57:01.000000000 -0800
+@@ -256,6 +256,29 @@
+ if [ "$CONFIG_SMP" = "y" -a "$CONFIG_X86_CMPXCHG" = "y" ]; then
+ define_bool CONFIG_HAVE_DEC_LOCK y
+ fi
++
++choice 'Bigger Stack Size Support' \
++ "off CONFIG_NOBIGSTACK \
++ 16KB CONFIG_STACK_SIZE_16KB \
++ 32KB CONFIG_STACK_SIZE_32KB \
++ 64KB CONFIG_STACK_SIZE_64KB" off
++
++if [ "$CONFIG_NOBIGSTACK" = "y" ]; then
++ define_int CONFIG_STACK_SIZE_SHIFT 1
++else
++ if [ "$CONFIG_STACK_SIZE_16KB" = "y" ]; then
++ define_int CONFIG_STACK_SIZE_SHIFT 2
++ else
++ if [ "$CONFIG_STACK_SIZE_32KB" = "y" ]; then
++ define_int CONFIG_STACK_SIZE_SHIFT 3
++ else
++ if [ "$CONFIG_STACK_SIZE_64KB" = "y" ]; then
++ define_int CONFIG_STACK_SIZE_SHIFT 4
++ fi
++ fi
++ fi
++fi
++
+ endmenu
+
+ mainmenu_option next_comment
+Index: kernel-2.4.21/arch/i386/vmlinux.lds
+===================================================================
+--- kernel-2.4.21.orig/arch/i386/vmlinux.lds.S 2002-02-25 11:37:53.000000000 -0800
++++ kernel-2.4.21/arch/i386/vmlinux.lds.S 2003-12-04 11:57:01.000000000 -0800
+@@ -35,7 +35,8 @@
+
+ _edata = .; /* End of data section */
+
+- . = ALIGN(8192); /* init_task */
++/* chose the biggest of the possible stack sizes here? */
++ . = ALIGN(65536); /* init_task */
+ .data.init_task : { *(.data.init_task) }
+
+ . = ALIGN(4096); /* Init code and data */
+Index: kernel-2.4.21/include/asm-i386/current.h
+===================================================================
+--- kernel-2.4.21.orig/include/asm-i386/current.h 1998-08-14 16:35:22.000000000 -0700
++++ kernel-2.4.21/include/asm-i386/current.h 2003-12-04 11:57:01.000000000 -0800
+@@ -1,15 +1,43 @@
+ #ifndef _I386_CURRENT_H
+ #define _I386_CURRENT_H
++#include <asm/page.h>
++
++/*
++ * Configurable page sizes on i386, mainly for debugging purposes.
++ * (c) Balbir Singh
++ */
++
++#ifdef __ASSEMBLY__
++
++#define PAGE_SIZE 4096 /* as cannot handle 1UL << 12 */
++#define THREAD_SIZE ((1 << CONFIG_STACK_SIZE_SHIFT) * PAGE_SIZE)
++
++#define GET_CURRENT(reg) \
++ movl $-THREAD_SIZE, reg; \
++ andl %esp, reg
++
++#else /* __ASSEMBLY__ */
++
++#define THREAD_SIZE ((1 << CONFIG_STACK_SIZE_SHIFT) * PAGE_SIZE)
++#define alloc_task_struct() \
++ ((struct task_struct *) __get_free_pages(GFP_KERNEL,CONFIG_STACK_SIZE_SHIFT))
++
++#define free_task_struct(p) \
++ free_pages((unsigned long) (p), CONFIG_STACK_SIZE_SHIFT)
++
++#define INIT_TASK_SIZE THREAD_SIZE
+
+ struct task_struct;
+
+ 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;
+ }
+
+ #define current get_current()
+
++#endif /* __ASSEMBLY__ */
++
+ #endif /* !(_I386_CURRENT_H) */
+Index: kernel-2.4.21/include/asm-i386/hw_irq.h
+===================================================================
+--- kernel-2.4.21.orig/include/asm-i386/hw_irq.h 2001-11-22 11:46:18.000000000 -0800
++++ kernel-2.4.21/include/asm-i386/hw_irq.h 2003-12-04 11:57:01.000000000 -0800
+@@ -15,6 +15,7 @@
+ #include <linux/config.h>
+ #include <asm/atomic.h>
+ #include <asm/irq.h>
++#include <asm/current.h>
+
+ /*
+ * IDT vectors usable for external interrupt sources start
+@@ -113,10 +114,6 @@
+ #define IRQ_NAME2(nr) nr##_interrupt(void)
+ #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
+
+-#define GET_CURRENT \
+- "movl %esp, %ebx\n\t" \
+- "andl $-8192, %ebx\n\t"
+-
+ /*
+ * SMP has a few special interrupts for IPI messages
+ */
+Index: kernel-2.4.21/include/asm-i386/processor.h
+===================================================================
+--- kernel-2.4.21.orig/include/asm-i386/processor.h 2003-06-13 07:51:38.000000000 -0700
++++ kernel-2.4.21/include/asm-i386/processor.h 2003-12-04 11:57:01.000000000 -0800
+@@ -14,6 +14,7 @@
+ #include <asm/types.h>
+ #include <asm/sigcontext.h>
+ #include <asm/cpufeature.h>
++#include <asm/current.h>
+ #include <linux/cache.h>
+ #include <linux/config.h>
+ #include <linux/threads.h>
+@@ -453,9 +454,6 @@
+ #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 get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
+
+ #define init_task (init_task_union.task)
+Index: kernel-2.4.21/include/linux/sched.h
+===================================================================
+--- kernel-2.4.21.orig/include/linux/sched.h 2003-06-13 15:26:52.000000000 -0700
++++ kernel-2.4.21/include/linux/sched.h 2003-12-04 12:00:14.000000000 -0800
+@@ -2,6 +2,7 @@
+ #define _LINUX_SCHED_H
+
+ #include <asm/param.h> /* for HZ */
++#include <asm/current.h> /* maybe for INIT_TASK_SIZE */
+
+ extern unsigned long event;
+
+Index: kernel-2.4.21/include/asm-x86_64/current.h
+===================================================================
+--- kernel-2.4.21.orig/include/asm-x86_64/current.h 2003-06-13 15:26:52.000000000 -0700
++++ kernel-2.4.21/include/asm-x86_64/current.h 2003-12-04 12:00:13.000000000 -0800
+@@ -5,6 +5,7 @@
+ struct task_struct;
+
+ #include <asm/pda.h>
++#include <asm/page.h>
+
+ static inline struct task_struct *get_current(void)
+ {
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