[yocto] PREEMPT-RT patch: wrong header

[Bruce Ashfield]

On 12/07/2015 08:03 AM, mike9874 channel wrote:
> Hello,
> i am building an image for qeumux86 with the PREEMT-RT patch. Therefore
> I use the following in my image.conf file:
> PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"
> PREFERRED_VERSION_linux-yocto-rt ?= "4%"
>
> I get an image with the 4.1.8-rt8-yocto-preempt-rt kernel. I have an
> Application which is also build into the image where I try to use
> SCHED_DEADLINE with sched_setattr() and struct sched_attr from
> <sched.h>. My bitbake compiler throws following error: storage size of
> 'scheduling_attribut' isn't known.
> Where do I get the correct Headers to compile my application?

You need to look at the kernel sources themselves:

STAGING_KERNEL_DIR = "${TMPDIR}/work-shared/${MACHINE}/kernel-source"

The preempt-rt kernel isn't messing with the libc-headers, so if you
are missing a struct that it is modifying, it'll be in the kernel
source itself.

Bruce

>
> Regards,
> Mike
>
>