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| author |   Christian Borntraeger <borntraeger@de.ibm.com> | 2008-01-26 14:11:16 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-01-26 14:11:23 +0100 |
| commit | a2fd64d6aaf498756f700eb1d07818efee046733 (patch) | |
| tree | f89c7119bcb00826a7ed99b14d2bbe7d2edcc043 /include | |
| parent | [S390] Initialize sclp_ipl_info (diff) | |
| download | linux-dev-a2fd64d6aaf498756f700eb1d07818efee046733.tar.xz linux-dev-a2fd64d6aaf498756f700eb1d07818efee046733.zip | |
[S390] vmemmap: allocate struct pages before 1:1 mapping
We have seen an oops in an OOM situation, where show_mem tried to
access the struct page of a dcss segment. The vmemmap code has
already created the 1:1 mapping but failed allocating the struct
pages. In the OOM case, show_mem now walks the memory. It uses
pfn_valid to detect if it may access the struct page. In the case
described above, the mapping was established and pfn_valid returned
true. As the struct pages were not allocated, the kernel oopsed.
We have to ensure that we have created the struct pages, before we
add a mapping pointing to the pages.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions