[PATCH] ARM: ptrace: fix ptrace_read_user for !CONFIG_MMU platforms

[Russell King - ARM Linux]

On Mon, Feb 20, 2012 at 06:37:09PM +0000, Will Deacon wrote:
> Commit 68b7f715 ("nommu: ptrace support") added definitions for
> PT_TEXT_ADDR and friends, as well as adding ptrace support for reading
> from these magic offsets.
> 
> Unfortunately, this has probably never worked, since ptrace_read_user
> predicates reading on off < sizeof(struct user), returning -EOI
> otherwise.
> 
> This patch moves the offset size check until after we have tried to
> match it against either a magic value or an offset into pt_regs.

Does this actually get used?  The fact that it's been broken from day one
and no one's raised the issue in 2.5 years suggests that it's dead code.