If you are talking about the rt_preempt patch, then yes it is integrated in the kernel, but you have to enable it at compile time. you can get some useful information here:

http://rt.wiki.kernel.org/index.php/Main_Page

and at the osadl homepage there is a nice table, about which feature is available since which release, and for which cpu:

http://www.osadl.org/Realtime-Linux.projects-realtime-linux.0.html

If you want to know more about different realtime variants for Linux (RTLinux/Pro, RTLinux/GPL, RTAI,...) you could check out this document:
http://dslab.lzu.edu.cn:8080/docs/summer_school_2005/docs/study.pdf
It is from 2005, so there might have been some big changes since then. But it gives a good introduction into concepts.

Andi


[email protected] wrote:
Hi All,

Can we call Linux 2.6 as rtlinux without any patch?

Regards,
Sikandar


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