linux-kernel - Re: [PATCH v1 2/7] arm64: introduce interfaces to hotpatch kernel and module code

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Date:	Wed, 25 Sep 2013 11:16:05 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
Cc:	Jiang Liu <liuj97@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Jiang Liu <jiang.liu@...wei.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/7] arm64: introduce interfaces to hotpatch kernel
 and module code

On Wed, 25 Sep 2013 20:12:17 +0530
Sandeepa Prabhu <sandeepa.prabhu@...aro.org> wrote:


> > On aarch64, are instructions always word aligned? If not, it should be
> > safe for stop machine to modify non word aligned instructions, but this
> > patch looks like it doesn't allow stop_machine() to do so.
> Steve,
> 
> Yes, aarch64 instructions must be word-aligned, else instruction fetch
> would generate Misaligned PC fault.
> 

Thanks for clarifying, as IIUC, there's ARM architectures that allow
for 2 and 4 byte instructions.

-- Steve
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