RFC ARM/KGDB: Some fixes for SMP machines
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- v1 RFC Latest4 patches 3 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/4 | ARM: kgdb: Must poll for IPIs during busy-waitingarch/ kernel/ | +30 | 0 replies | |
| 2/4 | ARM: kgdb: Disable preemption before re-enabling interruptsarch/ | +8 | 0 replies | |
| 3/4 | net: Implement napi_try_disable()include/ | +21 | 0 replies | |
| 4/4 | kgdb: Quiesce IO back-end before rounding up secondary CPUsdrivers/ include/ kernel/ | +29 | 0 replies |
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Cover letter [PATCH RFC 0/4] ARM/KGDB: Some fixes for SMP machines
Hi all,
It appears that KGDB can easily hang SMP ARM machines.
Here are few fixes that I come up with.
Before the patches, doing 'b schedule' and then 1-3 'continue' or 'si' gdb commands would cause the board to lock-up completely.
After the patches, KGDB seems to be bullet proof. Well, at least with the 'b schedule' testcase, there might be other bugs which I didn't hit yet. ;-)
Notes:
1. I'm testing with I/D caches disabled. With enabled caches, ARMv6K still locks-up. I'll test ARMv7 soon, and will try to debug cache issues on ARMv6K.
2. The patches are against a heavily patched kernel, and so far I didn't rebase them onto the 'debug core' rework as found in the very latest mainline kernels. I'll rebase the patches soon, so for now this is just an RFC.
Thanks!
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Anton Vorontsov email: cbouatmailru at gmail.com irc://irc.freenode.net/bd2