[OE-core] kernel.bbclass do_sizecheck behaviour changes

Khem Raj raj.khem at gmail.com
Thu Dec 7 19:20:44 UTC 2017

On Thu, Dec 7, 2017 at 8:15 AM, Mike Crowe <mac at mcrowe.com> wrote:
> I discovered today that our kernel size check has been ineffective since we
> took 7384d2831c713ac5999aca83c312154dc15cec56 from 2014 which changed the
> units for KERNEL_IMAGE_MAXSIZE from bytes to kilobytes.
> However whilst fixing that, I also noticed that
> 849b67b2e4820564b5e5c9bd4bb293c44351c5f3 in 2016 changed the consequences
> of exceeding the size from being fatal to merely a warning.
> This second change in behaviour wasn't described in the commit message, so
> I'm not sure whether it was intentional. I can believe that when generating
> multiple kernel image types it may not be essential that they all fit, but
> I don't really know what the use case for the feature is.
> I could fix this by adding to kernel.bbclass something like:
> and then using it when delivering the bad news so that recipes can override
> it if they wish.
> Alternatively, I could treat the error as being fatal if none of the kernel
> images fit within the required size. This would degenerate to the old
> behaviour automatically if KERNEL_IMAGETYPES contains only one entry.
> Does one of these solutions appeal, or is there another even better
> solution?

I think default should be a warning with a possibility to be turned
into an error
if user wishes too. I think if you are generating multiple kernel types then you
will use all of them somewhere, so I would say if the size of one of
them excedes
the set limit them break the build.

> Thanks.
> Mike.
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