From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 27 May 2010 19:55:44 +0000
Subject: [PATCH 0/2] blackfin: ptrace mm/sram_list fixes
Message-Id: <20100527195544.GA25935@redhat.com>
List-Id: <linux-sh.vger.kernel.org>
References: <1274431345-22366-1-git-send-email-vapier@gentoo.org> <20100521162659.GA16193@redhat.com> <20100521183512.4477F40476@magilla.sf.frob.com> <20100522165320.GA19573@redhat.com> <25539.1274711817@redhat.com> <20100524151445.GA6393@redhat.com> <17134.1274778852@redhat.com> <20100525102345.GA23574@redhat.com> <AANLkTilT3D8c86LYK2DxcNpM2F3D8iCbgY_sfUg8h58p@mail.gmail.com> <20100526124006.GA28358@redhat.com>
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To: Mike Frysinger <vapier.adi@gmail.com>, Andrew Morton <akpm@linux-foundation.org>
Cc: David Howells <dhowells@redhat.com>, Roland McGrath <roland@redhat.com>, linux-sh@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>, uclinux-dist-devel@blackfin.uclinux.org, linux-kernel@vger.kernel.org

On 05/26, Oleg Nesterov wrote:
>
> On 05/25, Mike Frysinger wrote:
> >
> > we probably should add proper locking to this
> > structure though.
>
> Agreed. I'll try to make the trivial patch tomorrow. I think we
> can just use mm->mmap_sem, is_user_addr_valid() needs this lock
> for find_vma() anyway.

please see the patches.

UNTESTED! the second one certainly needs the review from someone
who knows what this code does ;)

BTW. Obviously sys_sram_alloc() can create multiple sram_list_struct
nodes with the same ->addr (with or without this patch), I hope this
is fine.

Oleg.