x86: Remove CONFIG_4KSTACKS

These days 4 kilobytes of stack just aren't enough for reliably operation,
and people using lots of threads have long switched to 64-bit kernels, so
remove the CONFIG_4KSTACKS option.

Signed-off-by: Christoph Hellwig <hch@lst.de>
LKML-Reference: <20100628121614.GB6605@lst.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index badda8e..7f15308 100644 (file)
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -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

diff --git a/arch/x86/include/asm/module.h b/arch/x86/include/asm/module.h
index 3e2ce58..67763c5 100644 (file)
--- a/arch/x86/include/asm/module.h
+++ b/arch/x86/include/asm/module.h
@@ -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 */

diff --git a/arch/x86/include/asm/page_32_types.h b/arch/x86/include/asm/page_32_types.h
index 6f1b733..ade619f 100644 (file)
--- a/arch/x86/include/asm/page_32_types.h
+++ b/arch/x86/include/asm/page_32_types.h
@@ -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