Revision be14eb619108fa8b7120eb2c42d66d5f623ae10e authored by Brian King on 10 September 2010, 07:03:21 UTC, committed by Jens Axboe on 10 September 2010, 07:03:21 UTC
While testing CPU DLPAR, the following problem was discovered. We were DLPAR removing the first CPU, which in this case was logical CPUs 0-3. CPUs 0-2 were already marked offline and we were in the process of offlining CPU 3. After marking the CPU inactive and offline in cpu_disable, but before the cpu was completely idle (cpu_die), we ended up in __make_request on CPU 3. There we looked at the topology map to see which CPU to complete the I/O on and found no CPUs in the cpu_sibling_map. This resulted in the block layer setting the completion cpu to be NR_CPUS, which then caused an oops when we tried to complete the I/O. Fix this by sanity checking the value we return from blk_cpu_to_group to be a valid cpu value. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 532 bytes |
| Makefile | -rw-r--r-- | 274 bytes |
| compr.c | -rw-r--r-- | 1.8 KB |
| dev_bdev.c | -rw-r--r-- | 8.5 KB |
| dev_mtd.c | -rw-r--r-- | 6.7 KB |
| dir.c | -rw-r--r-- | 21.0 KB |
| file.c | -rw-r--r-- | 6.9 KB |
| gc.c | -rw-r--r-- | 20.2 KB |
| inode.c | -rw-r--r-- | 10.6 KB |
| journal.c | -rw-r--r-- | 23.7 KB |
| logfs.h | -rw-r--r-- | 23.8 KB |
| logfs_abi.h | -rw-r--r-- | 16.8 KB |
| readwrite.c | -rw-r--r-- | 55.6 KB |
| segment.c | -rw-r--r-- | 23.8 KB |
| super.c | -rw-r--r-- | 16.7 KB |
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