Re: Missing symbol on sh4: "__get_user_unknown"
On 5/10/20 3:27 PM, Ben Hutchings wrote:
>> In any case, the kernel package now fails to build due to a missing symbol in the
>> Infiniband core driver (see below). A simple workaround is to disable Infiniband
>> support which allows me to build the kernel package normally (which I did and
>> consequently uploaded).
> [...]
>
> __get_user_unknown() is never defined, but will be referenced if the
> get_user() macro is invoked with a variable of unsupported size (see
> arch/sh/include/asm/uaccess.h). So my guess is that this module uses
> get_user() to read a 64-bit value. Some 32-bit architectures do now
> support this operation but I'm not sure whether they are expected to.
I see, thanks a lot for the explanation.
> This seems to have been introduced by commit 3a6532c9af1a, and could
> probably be fixed by replacing the get_user() with a copy_from_user().
>
> We could disable IB since it doesn't seem that likely to be used on
> sh4, although I think the "verbs" layer can be used on top of Ethernet.
I'm fine with that.
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - glaubitz@debian.org
`. `' Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
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