linux-kernel - Re: [PATCH v2 1/5] uprobes: don't recheck vma/f_mapping in write

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Message-ID: <20120709103032.GF32393@linux.vnet.ibm.com>
Date:	Mon, 9 Jul 2012 16:00:35 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] uprobes: don't recheck vma/f_mapping in
 write_opcode()

* Oleg Nesterov <oleg@...hat.com> [2012-06-24 17:00:02]:

> write_opcode() rechecks valid_vma() and ->f_mapping, this is pointless.
> The caller, register_for_each_vma() or uprobe_mmap(), has already done
> these checks under mmap_sem.
> 
> To clarify, uprobe_mmap() checks valid_vma() only, but we can rely on
> build_probe_list(vm_file->f_mapping->host).
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

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