Re: [PATCH 2/3 RESEND] ptrace: cleanup address space conversion on ptrace_request()

[Arnd Bergmann]

On Monday 23 August 2010, Namhyung Kim wrote:
> But removing __force results in following sparse warning:
> 
>  ptrace.c:567:40: warning: cast adds address space to expression
> (<asn:1>)

The problem is that ptrace takes a 'long' argument, not 'unsigned long'.
Sparse complains about adding address spaces in all casts except those
from/to unsigned long, which we often use as an opaque token that can
fit anything.

I don't think we ever rely on 'data' being signed, and user space
sees it as 'void *' anyway, so it should be possible to just turn
it into 'unsigned long'.

	Arnd
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