2.4.15: undefined reference to `show_trace_task'

[Phil Howard]

While compiling 2.4.15 for sparc (32-bit) platform I encounted:

=============================================================================
ld -m elf32_sparc -T arch/sparc/vmlinux.lds arch/sparc/kernel/head.o arch/sparc/kernel/init_task.o init/main.o init/version.o \
        --start-group \
        arch/sparc/kernel/kernel.o arch/sparc/mm/mm.o kernel/kernel.o mm/mm.o fs/fs.o ipc/ipc.o arch/sparc/math-emu/math-emu.o arch/sparc/boot/btfix.o \
         drivers/char/char.o drivers/block/block.o drivers/misc/misc.o drivers/net/net.o drivers/media/media.o drivers/scsi/scsidrv.o drivers/cdrom/driver.o drivers/sbus/sbus_all.o drivers/video/video.o \
        net/network.o \
        /home/root/kernel-2.4.15/linux/lib/lib.a /home/root/kernel-2.4.15/linux/lib/lib.a /home/root/kernel-2.4.15/linux/arch/sparc/prom/promlib.a /home/root/kernel-2.4.15/linux/arch/sparc/lib/lib.a \
        --end-group \
        -o vmlinux
kernel/kernel.o: In function `show_task':
kernel/kernel.o(.text+0x16a4): undefined reference to `show_trace_task'
make: *** [vmlinux] Error 1
=============================================================================

I scanned all source files for "show_trace_task" and found:

=============================================================================
arch/alpha/kernel/traps.c:132:void show_trace_task(struct task_struct * tsk)
arch/arm/kernel/traps.c:154:void show_trace_task(struct task_struct *tsk)
arch/i386/kernel/traps.c:156:void show_trace_task(struct task_struct *tsk)
arch/sparc64/kernel/traps.c:1406:void show_trace_task(struct task_struct *tsk)
kernel/sched.c:1160:            extern void show_trace_task(struct task_struct *tsk);
kernel/sched.c:1161:            show_trace_task(p);
=============================================================================

It looks like this didn't get implement across all platforms.

Can the call to show_trace_task() in kernel/sched.c be safely commented
out for now?