On 6/9/07, Ingo Molnar [off-list ref] wrote:

i'm pleased to announce the v2.6.21.4-rt11 kernel, which can be
downloaded from the usual place:

     http://people.redhat.com/mingo/realtime-preempt/

more info about the -rt patchset can be found in the RT wiki:

     http://rt.wiki.kernel.org

Not for ARM yet :(

What should I try for the ARM architecture? There are many choices and
I don't know what is the more friendly. By friendly I mean the one that
is likely to be merged and that cooperate with you.

to build a 2.6.21.4-rt11 tree, the following patches should be applied:

    http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.4.tar.bz2
    http://people.redhat.com/mingo/realtime-preempt/patch-2.6.21.4-rt11

Using this patch:

  http://people.redhat.com/mingo/realtime-preempt/patch-2.6.21.4-rt14

  LD      init/built-in.o
  LD      .tmp_vmlinux1
kernel/built-in.o(.text+0xd3f0): In function `do_sys_settimeofday':
: undefined reference to `warp_check_clock_was_changed'
kernel/built-in.o(.text+0x12588): In function `timekeeping_resume':
: undefined reference to `warp_check_clock_was_changed'
kernel/built-in.o(.text+0x132f8): In function `do_sysinfo':
: undefined reference to `__get_nsec_offset'
kernel/built-in.o(.text+0x20a04): In function `ktime_get_ts':
: undefined reference to `__get_nsec_offset'
kernel/built-in.o(.text+0x221c0): In function `$a':
: undefined reference to `warp_check_clock_was_changed'
kernel/built-in.o(.text+0x22208): In function `$a':
: undefined reference to `warp_check_clock_was_changed'
kernel/built-in.o(.text+0x2b9dc): In function `$a':
: undefined reference to `usecs_to_cycles'
make: *** [.tmp_vmlinux1] Error 1

Regards.

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