hwcap on aarch64 linux is 64bit
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bug
- Dominant language
- C
- Stars
- 1.2k
- Forks
- 409
- PR merge metrics
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Description
hwcap and hwcap2 are 64bit values on arm64 linux so consistently using uint32_t for it is wrong.
(top 32bit of hwcap is reserved for libc use so may not be relevant for cpuinfo, but hwcap2 is 64bit and top bits are already in use.)
https://elixir.bootlin.com/linux/latest/source/arch/arm64/include/uapi/asm/hwcap.h
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Read the Linux arm64 hwcap definition linked in the issue, then locate the cpuinfo code that stores or reads hwcap and hwcap2. Done means those values are handled as 64-bit on aarch64 Linux without breaking existing platforms; the payload names no tests, so identify the relevant validation while working.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c, linux
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100