linux-kernel - Re: [PATCH 1/2] uprobes: Pass probed vaddr to arch_uprobe_analyze

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Message-ID: <20120606163050.GB32094@linux.vnet.ibm.com>
Date:	Wed, 6 Jun 2012 22:00:50 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, lkml <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>, benh@...nel.crashing.org,
	Anton Blanchard <anton@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	peterz@...radead.org
Subject: Re: [PATCH 1/2] uprobes: Pass probed vaddr to
 arch_uprobe_analyze_insn()

* Oleg Nesterov <oleg@...hat.com> [2012-06-06 17:08:48]:

> On 06/06, Ananth N Mavinakayanahalli wrote:
> >
> > From: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> >
> > On RISC architectures like powerpc, instructions are fixed size.
> > Instruction analysis on such platforms is just a matter of (insn % 4).
> > Pass the vaddr at which the uprobe is to be inserted so that
> > arch_uprobe_analyze_insn() can flag misaligned registration requests.
> 
> And the next patch checks "vaddr & 0x03".
> 
> But why do you need this new arg? arch_uprobe_analyze_insn() could
> check "container_of(auprobe, struct uprobe, arch)->offset & 0x3" with
> the same effect, no? vm_start/vm_pgoff are obviously page-aligned.
> 

We cant use container_of because we moved the definition for struct
uprobe to kernel/events/uprobe.c. This was possible before when struct
uprobe definition was in include/uprobes.h 

-- 
Thanks and Regards
Srikar

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