Revision 46b30ea9bc3698bc1d1e6fd726c9601d46fa0a91 authored by Tejun Heo on 21 September 2010, 05:57:19 UTC, committed by Tejun Heo on 21 September 2010, 06:12:25 UTC
pcpu_first/last_unit_cpu are used to track which cpu has the first and last units assigned. This in turn is used to determine the span of a chunk for man/unmap cache flushes and whether an address belongs to the first chunk or not in per_cpu_ptr_to_phys(). When the number of possible CPUs isn't power of two, a chunk may contain unassigned units towards the end of a chunk. The logic to determine pcpu_last_unit_cpu was incorrect when there was an unused unit at the end of a chunk. It failed to ignore the unused unit and assigned the unused marker NR_CPUS to pcpu_last_unit_cpu. This was discovered through kdump failure which was caused by malfunctioning per_cpu_ptr_to_phys() on a kvm setup with 50 possible CPUs by CAI Qian. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: CAI Qian <caiqian@redhat.com> Cc: stable@kernel.org
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| arch | ||
| block | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .gitignore | -rw-r--r-- | 936 bytes |
| .mailmap | -rw-r--r-- | 3.9 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 91.8 KB |
| Kbuild | -rw-r--r-- | 2.4 KB |
| MAINTAINERS | -rw-r--r-- | 173.4 KB |
| Makefile | -rw-r--r-- | 50.5 KB |
| README | -rw-r--r-- | 17.0 KB |
| REPORTING-BUGS | -rw-r--r-- | 3.3 KB |
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