Commit 19733fe8 authored Jan 12, 2018 by Vasily Gorbik Committed by Martin Schwidefsky Oct 09, 2018

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



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>

parent 6cad0eb5

arch/s390/boot/head.S

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

arch/s390/include/asm/thread_info.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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__