Revision 3af57f78c38131b7a66e2b01e06fdacae01992a3 authored by Heiko Carstens on 17 January 2014, 08:37:15 UTC, committed by David S. Miller on 18 January 2014, 02:54:49 UTC
The s390 bpf jit compiler emits the signed divide instructions "dr" and "d" for unsigned divisions. This can cause problems: the dividend will be zero extended to a 64 bit value and the divisor is the 32 bit signed value as specified A or X accumulator, even though A and X are supposed to be treated as unsigned values. The divide instrunctions will generate an exception if the result cannot be expressed with a 32 bit signed value. This is the case if e.g. the dividend is 0xffffffff and the divisor either 1 or also 0xffffffff (signed: -1). To avoid all these issues simply use unsigned divide instructions. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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| File | Mode | Size |
|---|---|---|
| partitions | ||
| Kconfig | -rw-r--r-- | 3.6 KB |
| Kconfig.iosched | -rw-r--r-- | 1.6 KB |
| Makefile | -rw-r--r-- | 844 bytes |
| blk-cgroup.c | -rw-r--r-- | 28.8 KB |
| blk-cgroup.h | -rw-r--r-- | 16.7 KB |
| blk-core.c | -rw-r--r-- | 87.2 KB |
| blk-exec.c | -rw-r--r-- | 3.2 KB |
| blk-flush.c | -rw-r--r-- | 15.7 KB |
| blk-integrity.c | -rw-r--r-- | 11.6 KB |
| blk-ioc.c | -rw-r--r-- | 10.2 KB |
| blk-iopoll.c | -rw-r--r-- | 5.9 KB |
| blk-lib.c | -rw-r--r-- | 7.0 KB |
| blk-map.c | -rw-r--r-- | 8.2 KB |
| blk-merge.c | -rw-r--r-- | 13.1 KB |
| blk-mq-cpu.c | -rw-r--r-- | 2.2 KB |
| blk-mq-cpumap.c | -rw-r--r-- | 2.3 KB |
| blk-mq-sysfs.c | -rw-r--r-- | 9.5 KB |
| blk-mq-tag.c | -rw-r--r-- | 4.6 KB |
| blk-mq-tag.h | -rw-r--r-- | 894 bytes |
| blk-mq.c | -rw-r--r-- | 33.8 KB |
| blk-mq.h | -rw-r--r-- | 1.4 KB |
| blk-settings.c | -rw-r--r-- | 26.3 KB |
| blk-softirq.c | -rw-r--r-- | 4.4 KB |
| blk-sysfs.c | -rw-r--r-- | 16.0 KB |
| blk-tag.c | -rw-r--r-- | 9.8 KB |
| blk-throttle.c | -rw-r--r-- | 46.0 KB |
| blk-timeout.c | -rw-r--r-- | 5.2 KB |
| blk.h | -rw-r--r-- | 7.8 KB |
| bsg-lib.c | -rw-r--r-- | 6.0 KB |
| bsg.c | -rw-r--r-- | 23.6 KB |
| cfq-iosched.c | -rw-r--r-- | 120.5 KB |
| cmdline-parser.c | -rw-r--r-- | 4.8 KB |
| compat_ioctl.c | -rw-r--r-- | 20.8 KB |
| deadline-iosched.c | -rw-r--r-- | 11.3 KB |
| elevator.c | -rw-r--r-- | 24.1 KB |
| genhd.c | -rw-r--r-- | 44.1 KB |
| ioctl.c | -rw-r--r-- | 10.7 KB |
| noop-iosched.c | -rw-r--r-- | 2.7 KB |
| partition-generic.c | -rw-r--r-- | 14.0 KB |
| scsi_ioctl.c | -rw-r--r-- | 19.2 KB |
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