CONFIG_PREEMPT_VOLUNTARY in bcm2711 32-bit, but CONFIG_PREEMPT for 64-bit
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- c, linux
- Domain
- build-system, operating-systems
Research direction
Start by comparing the 32-bit and 64-bit bcm2711 defconfig settings, focusing on CONFIG_PREEMPT_VOLUNTARY versus CONFIG_PREEMPT. Investigate why the configurations differ and whether the scheduling behavior or the out-of-tree driver context explains the panic. Done means the difference has a documented rationale or the configurations are aligned with suitable validation.
Written by the indexing model from the issue text.
Description
I am surprised to notice that the PREEMPT option for 32-bit bcm2711 (pi4) build vs 64-bit build is different, one is VOLUNTARY the other is plain PREEMPT (ie full). I assumed that the latter is the variant since raspberry pi can run in 64-bit mode only in the last couple of years with pi3/pi4, until I Google'd and found #1216 .
Anyway, I am wondering if they should differ as little as possible. There are a dozen or so differences in the two defconfig, but this is obviously major.
FWIW, I am looking at the issue because of a sh*tty out-of-tree driver issue which seems to be much more serious with 64-bit kernel, with a kernel panic about "scheduling while atomic"...
- Dominant language
- C
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- Avg merge
- 2d 21h
- Merged PRs (30d)
- 21
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