girish
authored
Current journal checksumming patch failed fsstress test on NUMA. The bh->b_data passed to the crc32_be () function could be NULL pointer, which caused kernel oops immediately when running fsstress with -o journal_checksum. It is because the page is part of highmem on NUMA box. We need to kmap the page before access the bh->b_data to calculate the checksums.
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