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s390/head: avoid doubling early boot stack size under KASAN

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Early boot stack uses predefined 4 pages of memory 0x8000-0xC000. This
stack is used to run not instumented decompressor/facilities
verification C code. It doesn't make sense to double its size when
the kernel is built with KASAN support. BOOT_STACK_ORDER is introduced
to avoid that.

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 2018-01-12 12:46:00 +01:00 committed by Martin Schwidefsky
parent 6cad0eb561
commit 19733fe872
2 changed files with 2 additions and 1 deletions
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2
arch/s390/boot/head.S
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@ -315,7 +315,7 @@ ENTRY(startup_kdump)
brasl %r14,startup_kernel
.Lstack:
.long 0x8000 + THREAD_SIZE - STACK_FRAME_OVERHEAD
.long 0x8000 + (1<<(PAGE_SHIFT+BOOT_STACK_ORDER)) - STACK_FRAME_OVERHEAD
.align 8
6: .long 0x7fffffff,0xffffffff

1
arch/s390/include/asm/thread_info.h
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@ -18,6 +18,7 @@
#else
#define THREAD_SIZE_ORDER 2
#endif
#define BOOT_STACK_ORDER 2
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#ifndef __ASSEMBLY__