From: Christian Borntraeger Date: Sat, 26 Jan 2008 13:11:16 +0000 (+0100) Subject: [S390] vmemmap: allocate struct pages before 1:1 mapping X-Git-Tag: v2.6.25-rc1~1228^2~15 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a2fd64d6aaf498756f700eb1d07818efee046733;p=pandora-kernel.git [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 Signed-off-by: Martin Schwidefsky --- Reading git-diff-tree failed