[poky] RT-patch for Yocto-kernel

[Keskinarkaus, Teemu]

Hi,

In our system we want to use Full RT - kernel configuration. I learned that Yocto/Poky Preempt - rt is actually just low latency configuration and not the real Full RT as the name falsely suggests. Anyway, that's not the problem after I found it.

There is a patch in the kernel.org that adds the Full RT support for the kernel. Unfortunately it doesn't work right away in Yocto kernel. We use emenlow variant of the kernel.

So I compiled the system and then fixed the patch by applying it to kernel sources in build-directory. Then added the  patch to kernel .bbappend file so that it would be applied during compilation time.  Or so I thought.

Now when I try to compile the system do_patch - state for linux-yocto-rt - fails.

Log data follows:
| DEBUG: Executing shell function do_patch
| Deleted branch meta-temp (was 37fdb0c).
| [INFO] validating against known patches  (emenlow-preempt-rt-meta)
Context reduced to (2/2) to apply fragment at 385    ] (\)(88 %))
error: patch failed: drivers/net/ethernet/ti/cpsw.c:374(/)(92 %)%)
| error: drivers/net/ethernet/ti/cpsw.c: patch does not apply
| Context reduced to (1/1) to apply fragment at 1050
| error: patch failed: include/linux/preempt.h:107
| error: include/linux/preempt.h: patch does not apply
| error: patch failed: kernel/sched/core.c:1477
| error: kernel/sched/core.c: patch does not apply
| ERROR. could not update git tree
| ERROR. Could not apply patches for emenlow.
|        Patch failures can be resolved in the devshell (bitbake -c devshell linux-yocto-rt)

If I'm understanding that right it actually applied my patch before the emenlow-patch and that's why it fails.

What's the proper way to make kernel patch that big or is there already Full RT - patch for emenlow kernel for yocto? We have smaller patches that don't collide with emmenlow patches and they work just fine.

Teemu Keskinarkaus



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