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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 | |
| parent | 67b5c3eeb4814bceb9a7e17fecb14ef59d511812 (diff) | |
| download | op-kernel-dev-df1bd59c5cc247d1d02588ff0a4e86a0cc5f9733.zip op-kernel-dev-df1bd59c5cc247d1d02588ff0a4e86a0cc5f9733.tar.gz | |
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')
| -rw-r--r-- | arch/s390/kernel/crash_dump.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/early.c | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/setup.c | 2 |
3 files changed, 2 insertions, 3 deletions
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index fb8d878..30b7f63 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -88,7 +88,7 @@ static struct mem_chunk *get_memory_layout(void) struct mem_chunk *chunk_array; chunk_array = kzalloc_panic(MEMORY_CHUNKS * sizeof(struct mem_chunk)); - detect_memory_layout(chunk_array); + detect_memory_layout(chunk_array, 0); create_mem_hole(chunk_array, OLDMEM_BASE, OLDMEM_SIZE, CHUNK_CRASHK); return chunk_array; } diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index bda011e..dc8770d 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -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 diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 555f189..cdd9ec0 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(); |
