linux-kernel - Re: [PATCH 2/3 RESEND] ptrace: cleanup address space conversion on ptrace

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Date:	Tue, 24 Aug 2010 13:45:06 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3 RESEND] ptrace: cleanup address space conversion on ptrace_request()

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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