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s390/mem_detect: limit memory detection loop to "mem=" parameter

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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>
This commit is contained in:
Heiko Carstens
2013-04-30 10:34:04 +02:00
committed by Martin Schwidefsky
parent 67b5c3eeb4
commit df1bd59c5c
6 changed files with 25 additions and 9 deletions
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arch/s390/kernel/early.c
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@@ -482,7 +482,6 @@ void __init startup_init(void)
detect_machine_facilities();
setup_topology();
sclp_facilities_detect();
detect_memory_layout(memory_chunk);
#ifdef CONFIG_DYNAMIC_FTRACE
S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
#endif