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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2014-01-30 15:14:02 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-22 21:32:25 (GMT) |
| commit | 098aca659bb61ee89b8c7faf88f407b3fff322c3 (patch) | |
| tree | 9e329efb4715a6b3dbcd2e46e93b553c85c66d4f /net/wimax | |
| parent | b0fbb64d2152697878b4a84b4a7c155c2c22a7d7 (diff) | |
| download | linux-fsl-qoriq-098aca659bb61ee89b8c7faf88f407b3fff322c3.tar.xz | |
s390/dump: Fix dump memory detection
commit d7736ff5be31edaa4fe5ab62810c64529a24b149 upstream.
Dumps created by kdump or zfcpdump can contain invalid memory holes when
dumping z/VM systems that have memory pressure.
For example:
# zgetdump -i /proc/vmcore.
Memory map:
0000000000000000 - 0000000000bfffff (12 MB)
0000000000e00000 - 00000000014fffff (7 MB)
000000000bd00000 - 00000000f3bfffff (3711 MB)
The memory detection function find_memory_chunks() issues tprot to
find valid memory chunks. In case of CMM it can happen that pages are
marked as unstable via set_page_unstable() in arch_free_page().
If z/VM has released that pages, tprot returns -EFAULT and indicates
a memory hole.
So fix this and switch off CMM in case of kdump or zfcpdump.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/wimax')
0 files changed, 0 insertions, 0 deletions