would like to use the rt scheduler patch on a 2.4.21 kernel

[dave g. <giv...@ya...>]

I've seen the newest version of the patch which is for
the 2.4.16 kernel.

I'd like to use a newer kernel (2.4.21 or 2.4.22)

I've tried applying the 2.4.16 patch to a vanilla
2.4.21 kernel. But got the error below when compiling
(make bzImage). What should I do?

arch/i386/mm/mm.o(.text+0x4f4): In function
`__verify_write':
: undefined reference to `yield'
arch/i386/mm/mm.o(.text+0x7ed): In function
`do_page_fault':
: undefined reference to `yield'
kernel/kernel.o(.text+0x9bb1): In function
`tasklet_kill':
: undefined reference to `yield'
kernel/kernel.o(.text.init+0x5b1): In function
`spawn_ksoftirqd':
: undefined reference to `yield'
kernel/kernel.o(__ksymtab+0xb40): undefined reference
to `yield'
kernel/kernel.o(__ksymtab+0xb48): undefined reference
to `__cond_resched'
mm/mm.o(.text+0xd562): In function `__alloc_pages':
: undefined reference to `yield'
mm/mm.o(.text+0x1008e): In function `oom_kill':
: undefined reference to `yield'
fs/fs.o(.text+0x4065): In function `free_more_memory':
: undefined reference to `yield'
fs/fs.o(.text+0x14bf9): In function
`locks_wake_up_blocks':
: undefined reference to `yield'
fs/fs.o(.text+0x3bbda): In function
`nfs_create_request':
: undefined reference to `yield'
net/network.o(.text+0x1f): more undefined references
to `yield' follow
make: *** [vmlinux] Error 1


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