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From: Christoph Hellwig on 28 Jun 2010 08:20
These days 4 kilobytes of stack just aren't enough for reliably operation,
and people using lots of threads have long switched to 32-bit kernels, so
remove the CONFIG_4KSTACKS option.

Signed-off-by: Christoph Hellwig <hch(a)lst.de>

Index: linux-2.6/arch/x86/Kconfig.debug
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig.debug 2010-06-16 10:24:06.902272433 +0200
+++ linux-2.6/arch/x86/Kconfig.debug 2010-06-16 10:24:11.837068354 +0200
@@ -121,15 +121,6 @@ config DEBUG_NX_TEST
and the software setup of this feature.
If in doubt, say "N"

-config 4KSTACKS
- bool "Use 4Kb for kernel stacks instead of 8Kb"
- depends on X86_32
- ---help---
- If you say Y here the kernel will use a 4Kb stacksize for the
- kernel stack attached to each process/thread. This facilitates
- running more threads on a system and also reduces the pressure
- on the VM subsystem for higher order allocations.
-
config DOUBLEFAULT
default y
bool "Enable doublefault exception handler" if EMBEDDED
Index: linux-2.6/arch/x86/include/asm/module.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/module.h 2010-06-16 10:24:06.922004449 +0200
+++ linux-2.6/arch/x86/include/asm/module.h 2010-06-16 10:24:23.255291640 +0200
@@ -60,12 +60,7 @@
#endif

#ifdef CONFIG_X86_32
-# ifdef CONFIG_4KSTACKS
-# define MODULE_STACKSIZE "4KSTACKS "
-# else
-# define MODULE_STACKSIZE ""
-# endif
-# define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY MODULE_STACKSIZE
+# define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY
#endif

#endif /* _ASM_X86_MODULE_H */
Index: linux-2.6/arch/x86/include/asm/page_32_types.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/page_32_types.h 2010-06-16 10:24:06.933273132 +0200
+++ linux-2.6/arch/x86/include/asm/page_32_types.h 2010-06-16 10:24:30.251005496 +0200
@@ -15,11 +15,7 @@
*/
#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)

-#ifdef CONFIG_4KSTACKS
-#define THREAD_ORDER 0
-#else
#define THREAD_ORDER 1
-#endif
#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)

#define STACKFAULT_STACK 0
--
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