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Accept single-bit ranges in bitmap lists - #15464
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Writing "1-1" to cpuset.cpus failed with EINVAL because the bitmap parser rejected ranges with equal endpoints. CpusetCgroup.SetMask reaches this case on a two-CPU system when it removes CPU 0 from the initial mask. Linux accepts equal endpoints as a single-bit range [1]. Reject only descending ranges and correct the existing parser case that expected an equal-endpoint range to fail. This applies to both cgroup versions, whose CPU and memory-node masks use the same parser. [1]: https://github.com/torvalds/linux/blob/e5f0a698b/lib/bitmap-str.c#L220-L231 Assisted-by: OpenAI Codex <!-- codex-thread: 01a0680f-bbf5-7511-95f7-4414f4e10d2e --> FUTURE_COPYBARA_INTEGRATE_REVIEW=#15446 from tamird:bitmap-inclusive-ranges 01d6bdf PiperOrigin-RevId: 995314862
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October 7, 2026 20:34
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Accept single-bit ranges in bitmap lists
Writing "1-1" to cpuset.cpus failed with EINVAL because the bitmap
parser rejected ranges with equal endpoints. CpusetCgroup.SetMask
reaches this case on a two-CPU system when it removes CPU 0 from the
initial mask. Linux accepts equal endpoints as a single-bit range 1.
Reject only descending ranges and correct the existing parser case that
expected an equal-endpoint range to fail. This applies to both cgroup
versions, whose CPU and memory-node masks use the same parser.
Assisted-by: OpenAI Codex
FUTURE_COPYBARA_INTEGRATE_REVIEW=#15446 from tamird:bitmap-inclusive-ranges 01d6bdf