Hi,
>>> Is is possible for you to create a git bisect to find the change that
>>> actually broke this?
>>> That would be really helpful.
>>
>> I can try that. What is the most efficient way to unload/recompile/load
>> a single module without rebooting the machine too often? And it'll be a
>> lot of hard resets ...
>
> A git bisect is really only possible in the full kernel tree.
> But it won't take a lot of steps to get a result, because you already
> narrowed it down to 4.14-4.15. It might take 10 iterations or so (git
> will tell you). Due to incremental builds that can be done pretty
> quickly. As the whole kernel is searched for a change, a reboot is
> usually needed after each iteration step.
Ah, yes. I had for a moment thought I might get away with recompiling
just the b43 module, but that does not work of course.
I did the bisection, it was 13 steps. My metric was to say 'modprobe
b43; rmmod b43'. If the rmmod returns it's good, otherwise bad. (I
booted every kernel only once, so I hope there is no randomness
involved.) In the latter case the machine had to be hard-reset. Also,
in the latter case 'lsmod | grep b43' returns after the failed rmmod:
b43 348160 -1
ssb 49152 1 b43
mac80211 688128 1 b43
cfg80211 540672 2 b43,mac80211
bcma 49152 1 b43
led_class 16384 4 b43,applesmc,sdhci,input_leds
the bisection leads to
142a27f0a731ddcf467546960a5585970ca98e21 is the first bad commit
commit 142a27f0a731ddcf467546960a5585970ca98e21
Author: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>
Date: Fri Oct 27 22:34:04 2017 +0530
hwrng: core - Reset user selected rng by writing "" to rng_current
User is able to select a chosen rng by writing its name to rng_current
but there is no way to reset it without unbinding the rng. Let user
write "" to rng_current and delesect the chosen rng.
Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>
reviewed-by: Harald Freudenberger <freude@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
:040000 040000 f61e5cc501c99fb09bae5f203528b9f4c3479f8a
785262813cfb02c9606fd72274f0f7b44f2289d7 M drivers
cheers, lukas
--
Do not believe the naysayers who say it cannot be done.
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