Re: [PATCH v1 2/7] arm64: introduce interfaces to hotpatch kerneland module code

From: Steven Rostedt
Date: Wed Sep 25 2013 - 11:16:13 EST

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