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s390/mem_detect: fix memory hole handling 

With git commit 996b4a7d "s390/mem_detect: remove artificial kdump
memory types" the memory detection code got simplified.
As a side effect the array that describes memory chunks may now
contain empty (zeroed) entries.
All call sites can handle this except for

drivers/s390/char/zcore.c::zcore_memmap_open

which has a really odd user space interface. The easiest fix is to
change the memory hole handling code, so that no empty entries exist
before the last valid entry is reached.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-06-19 09:16:54 +02:00 committed by Martin Schwidefsky
parent 4026099a31
commit 35b03aec91
1 changed files with 2 additions and 1 deletions
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3
arch/s390/mm/mem_detect.c
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@ -123,7 +123,8 @@ void create_mem_hole(struct mem_chunk mem_chunk[], unsigned long addr,
continue;
} else if ((addr <= chunk->addr) &&
(addr + size >= chunk->addr + chunk->size)) {
memset(chunk, 0 , sizeof(*chunk));
memmove(chunk, chunk + 1, (MEMORY_CHUNKS-i-1) * sizeof(*chunk));
memset(&mem_chunk[MEMORY_CHUNKS-1], 0, sizeof(*chunk));
} else if (addr + size < chunk->addr + chunk->size) {
chunk->size = chunk->addr + chunk->size - addr - size;
chunk->addr = addr + size;