From 67b5c3eeb4814bceb9a7e17fecb14ef59d511812 Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Tue, 30 Apr 2013 09:36:23 +0200
Subject: [PATCH] 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>
---
arch/s390/kernel/setup.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index f1e0ba5a5c3a7..555f1895972eb 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -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();
--
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