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s390/kdump,bootmem: fix bootmem allocator bitmap size 

When in kdump mode the kernel may access only the first couple of
megabytes for execution, the rest contains the dump. However
the size of the bitmap used by the bootmem allocator was calculated
for the whole amount of memory of the machine.

For very large machines this can lead to the situation that the kdump
kernel will not come up because not enough memory is available.

So fix this and calculate the size of the bitmap only for the piece
of memory that the kdump kernel actually uses.

Call reserve_oldmem() before setup_memory_end() so that the memory_chunk
array already has been updated with respect to oldmem chunks.
Afterwards setup_memory_end() will ignore those chunks.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
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 2013-04-30 09:36:23 +02:00 committed by Martin Schwidefsky
parent 118131a2d5
commit 67b5c3eeb4
1 changed files with 5 additions and 1 deletions
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6
arch/s390/kernel/setup.c
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@ -527,6 +527,8 @@ static void __init setup_memory_end(void)
unsigned long align;
chunk = &memory_chunk[i];
if (chunk->type == CHUNK_OLDMEM)
continue;
align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
start = (chunk->addr + align - 1) & ~(align - 1);
end = (chunk->addr + chunk->size) & ~(align - 1);
@ -577,6 +579,8 @@ static void __init setup_memory_end(void)
for (i = 0; i < MEMORY_CHUNKS; i++) {
struct mem_chunk *chunk = &memory_chunk[i];
if (chunk->type == CHUNK_OLDMEM)
continue;
if (chunk->addr >= memory_end) {
memset(chunk, 0, sizeof(*chunk));
continue;
@ -1065,9 +1069,9 @@ void __init setup_arch(char **cmdline_p)
os_info_init();
setup_ipl();
reserve_oldmem();
setup_memory_end();
setup_addressing_mode();
reserve_oldmem();
reserve_crashkernel();
setup_memory();
setup_resources();