Port-xen archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: xen-backend

Christoph Egger wrote:
Jean-Yves Migeon wrote:
Christoph Egger wrote:
I identified the debug printf's that make it work. See attached diff.
Commenting out one of them or both results in *xenbus_create not being called and produces a "Hotplug scripts not working" error.

A comparison of the assembler snippet in xenbus_probe_init:


Anyone seeing the impact ?
Well, I do not see anything suspicious in this assembly? I am perhaps missing something?

Question though: does it fix the bug (*xenbus_create not being called) only by using these printf's, or replacing them with some DELAY(whatever), __insn_barrier() or x86_lfence() has any effect?

__insn_barrier() and x86_mfence() have no effect at all on both printf's.

Both printf's can be replaced with DELAY(31), where 31 is the lowest
possible number. 30 and lower values don't work.

Problem fixed in
sys/arch/xen/xenbus/xenbus_probe.c, rev. 1.21.


Home | Main Index | Thread Index | Old Index