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SubjectRe: [PATCH 0/3] staging: vchiq: use interruptible waits
Hi Nicolas,

Am 05.04.19 um 13:34 schrieb Nicolas Saenz Julienne:
> Hi,
> this series tries to address an issue that came up in Raspbian's kernel
> tree [1]. After pulling from upstream some changes that moved wait calls
> from a custom implementation to the more standard killable family some
> users complained that all the VCHIQ threads showed up in D state (which
> is the expected behaviour).

this issue has already been noticed in mainline distributions [1],[2].

> The custom implementation we deleted tried to mimic the killable family
> of functions, yet accepted more signals than the later. SIGKILL |
> implementation as opposed to plain old SIGKILL.
> Raspbian maintainers decided roll back some of those changes and leave
> the wait functions as interruptible. Hence creating some divergence
> between both trees.
> One could argue that not liking having the threads stuck in D state is
> not really a software issue. It's more a cosmetic thing that can scare
> people when they look at "uptime". On the other hand, if we are ever to
> unstage this driver, we'd really need a proper justification for using
> the killable family of functions. Which I think it's not really clear at
> the moment.

I like to see this decision as a short comment in the code to prevent
other for doing this mistake again.



> As Raspbian's kernel has been working for a while with interruptible
> waits I propose we follow through. If needed we can always go back to
> killable. But at least we'll have a proper understanding on the actual
> needs. In the end the driver is in staging, and the potential for errors
> small.
> Regards,
> Nicolas
> [1]
[1] -

[2] -

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