s390/setup: do not reserve the decompressor code (514211f5) · Commits · 戴 / test

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>

arch/s390/include/asm/setup.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@


		#define PARMAREA 0x10400
		#define PARMAREA_END 0x11000

		/*
		* Machine features detected in early.c

arch/s390/kernel/setup.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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

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