Re: [PATCH 4/6] um: split up CONFIG_GCOV

[Johannes Berg]

Hi Brendan,

> Hey, thanks for doing this! I was looking into this a few weeks ago
> and root caused part of the issue in GCC and in the kernel, but I did
> not have a fix put together.
> 
> Anyway, most of the patches make sense to me, but I am not able to
> apply this patch on torvalds/master. Do you mind sending a rebase so I
> can test it?

Well, if you see my other replies in the thread, I gave up for various
reasons, see

https://lore.kernel.org/r/d36ea54d8c0a8dd706826ba844a6f27691f45d55.camel@xxxxxxxxxxxxxxxx

Personally, I ended up switching to CONFIG_GCOV_KERNEL instead because
it actually works for modules, but then it was _really_ slow (think 30s
to copy data for a few modules), but I root-caused this and ultimately
sent these patches instead:

https://patchwork.ozlabs.org/project/linux-um/patch/20210315233804.d3e52f6a3422.I9672eef7dfa7ce6c3de1ccf7ab8d9aad1fa7f3a6@changeid/
https://patchwork.ozlabs.org/project/linux-um/patch/20210315234731.2e03184a344b.I04f1816296f04c5aa7d7d88b33bd4a14dd458da8@changeid/


johannes