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s390/kasan: double the stack size

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Kasan stack instrumentation pads stack variables with redzones, which
increases stack frames size significantly. Stack sizes are increased
from 16k to 32k in the code, as well as for the kernel stack overflow
detection option (CHECK_STACK).

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2017-11-17 16:52:22 +01:00 committed by Martin Schwidefsky
parent 42db5ed860
commit 7fef92ccad
2 changed files with 5 additions and 1 deletions
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2
arch/s390/Makefile
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@ -27,7 +27,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)
KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
UTS_MACHINE := s390x
STACK_SIZE := 16384
STACK_SIZE := $(if $(CONFIG_KASAN),32768,16384)
CHECKFLAGS += -D__s390__ -D__s390x__
export LD_BFD

4
arch/s390/include/asm/thread_info.h
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@ -13,7 +13,11 @@
/*
* General size of kernel stacks
*/
#ifdef CONFIG_KASAN
#define THREAD_SIZE_ORDER 3
#else
#define THREAD_SIZE_ORDER 2
#endif
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#ifndef __ASSEMBLY__