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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-04-30 10:34:04 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-05-02 15:50:26 +0200 |
| commit | df1bd59c5cc247d1d02588ff0a4e86a0cc5f9733 (patch) | |
| tree | 619ab3b2ef639ebbcd102961c8710b852cd9adfc /arch/s390/kernel/setup.c | |
| parent | s390/kdump,bootmem: fix bootmem allocator bitmap size (diff) | |
| download | linux-dev-df1bd59c5cc247d1d02588ff0a4e86a0cc5f9733.tar.xz linux-dev-df1bd59c5cc247d1d02588ff0a4e86a0cc5f9733.zip | |
s390/mem_detect: limit memory detection loop to "mem=" parameter
The current memory detection loop will detect all present memory of
a machine. This is true even if the user specified the "mem=" parameter
on the kernel command line.
This can be a problem since the memory detection may cause a fully
populated host page table for the guest, even for those parts of the
memory that the guest will never use afterwards.
So fix this and only detect memory up to a user supplied "mem=" limit
if specified.
Reported-by: Michael Johanssen <johanssn@de.ibm.com>
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>
Diffstat (limited to 'arch/s390/kernel/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 555f1895972e..cdd9ec0a6fc0 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -1066,7 +1066,7 @@ void __init setup_arch(char **cmdline_p) memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); parse_early_param(); - + detect_memory_layout(memory_chunk, memory_end); os_info_init(); setup_ipl(); reserve_oldmem(); |