PREEMPT-RT patch: wrong header

PREEMPT-RT patch: wrong header

[mike9874 channel]

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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?

Regards,
Mike

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Re: PREEMPT-RT patch: wrong header

[mar.krzeminski]

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Hello,

I think you need to set PREFERRED_VERSION_linux-headers, but I have no 
idea what you should set for yocto-rt.

Regards,
Marcin

W dniu 07.12.2015 o 14:03, mike9874 channel pisze:
> 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?
>
> Regards,
> Mike
>
>


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Re: 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
>
>