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s390: remove small stack config option

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We've seen repeatedly that 8KB stack size on 64 bit kernels
is not sufficient.
So simply remove the config option.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-04-25 09:11:54 +02:00 committed by Martin Schwidefsky
parent 616498813b
commit 581618f226
3 changed files with 0 additions and 28 deletions
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13
arch/s390/Kconfig
View file

@ -375,19 +375,6 @@ config PACK_STACK
Say Y if you are unsure.
config SMALL_STACK
def_bool n
prompt "Use 8kb for kernel stack instead of 16kb"
depends on PACK_STACK && 64BIT && !LOCKDEP
help
If you say Y here and the compiler supports the -mkernel-backchain
option the kernel will use a smaller kernel stack size. The reduced
size is 8kb instead of 16kb. This allows to run more threads on a
system and reduces the pressure on the memory management for higher
order page allocations.
Say N if you are unsure.
config CHECK_STACK
def_bool y
prompt "Detect kernel stack overflow"

10
arch/s390/Makefile
View file

@ -55,22 +55,12 @@ cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
ifeq ($(call cc-option-yn,-mkernel-backchain),y)
cflags-$(CONFIG_PACK_STACK) += -mkernel-backchain -D__PACK_STACK
aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
cflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
aflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
ifdef CONFIG_SMALL_STACK
STACK_SIZE := $(shell echo $$(($(STACK_SIZE)/2)) )
endif
endif
# new style option for packed stacks
ifeq ($(call cc-option-yn,-mpacked-stack),y)
cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
cflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
aflags-$(CONFIG_SMALL_STACK) += -D__SMALL_STACK
ifdef CONFIG_SMALL_STACK
STACK_SIZE := $(shell echo $$(($(STACK_SIZE)/2)) )
endif
endif
ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)

5
arch/s390/include/asm/thread_info.h
View file

@ -14,13 +14,8 @@
#define THREAD_ORDER 1
#define ASYNC_ORDER 1
#else /* CONFIG_64BIT */
#ifndef __SMALL_STACK
#define THREAD_ORDER 2
#define ASYNC_ORDER 2
#else
#define THREAD_ORDER 1
#define ASYNC_ORDER 1
#endif
#endif /* CONFIG_64BIT */
#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)