Re: 2.6.5-mc2 switch_to() fix

[Andrew Morton <akpm@osdl.org>]

"David S. Miller" <davem@redhat.com> wrote:
>
> On Thu, 8 Apr 2004 05:25:17 -0700
> William Lee Irwin III <wli@holomorphy.com> wrote:
> 
> > This patch changes bne,pn to branch to a newly-introduced unconditional
> > branch, which may accept larger relocations than the conditional branch.
> > The branch delay slot of the converted conditional branch remains
> > intact, preserving the semantics where mov %g5, %0 is done
> > unconditionally. The annul bit is also set on the unconditional branch,
> > which prevents the execution of any instruction that may occur in its
> > branch delay slot from ever happening, rendering its position at the
> > end of the assembly fragment safe.
> 
> This patch looks fine.  But I'm very curious what changed in the -mm
> tree which moved the kernel/sched.o object so far away from the link
> into the arch/sparc64/kernel/head.o object (which is where the
> ret_from_syscall destination symbol is located).
> 
> Some Makefile or vmlinux.lds hacking has been taking place?  Actually,
> doesn't Rusty's early setup stuff mess with things like that?

Probably it's Bill's patches which move the scheduler functions into their
own ELF section for wcahn identification purposes.