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s390/setup: do not reserve the decompressor code

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Introduce PARMAREA_END, and use it for memblock reserve of low
memory, which is used for lowcore, kdump data mover code and page
buffer, early stack and parmarea. There is no need to reserve an
area between PARMAREA_END and the decompressor _ehead.

Reviewed-by: Heiko Carstens <heiko.carstens@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 2018-06-12 16:46:59 +02:00 committed by Martin Schwidefsky
parent 6075e4ae6e
commit 514211f542
2 changed files with 3 additions and 2 deletions
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1
arch/s390/include/asm/setup.h
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@ -11,6 +11,7 @@
#define PARMAREA 0x10400
#define PARMAREA_END 0x11000
/*
* Machine features detected in early.c

4
arch/s390/kernel/setup.c
View File

@ -674,12 +674,12 @@ static void __init reserve_kernel(void)
#ifdef CONFIG_DMA_API_DEBUG
/*
* DMA_API_DEBUG code stumbles over addresses from the
* range [_ehead, _stext]. Mark the memory as reserved
* range [PARMAREA_END, _stext]. Mark the memory as reserved
* so it is not used for CONFIG_DMA_API_DEBUG=y.
*/
memblock_reserve(0, PFN_PHYS(start_pfn));
#else
memblock_reserve(0, (unsigned long)_ehead);
memblock_reserve(0, PARMAREA_END);
memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
- (unsigned long)_stext);
#endif