linux-kernel - Re: [v4,2/6] powerpc: ftrace: restore LR from pt

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Message-Id: <3wBhLT756kz9s8S@ozlabs.org>
Date:   Tue, 25 Apr 2017 08:47:29 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [v4,2/6] powerpc: ftrace: restore LR from pt_regs

On Wed, 2017-04-19 at 12:52:24 UTC, "Naveen N. Rao" wrote:
> Pass the real LR to the ftrace handler. This is needed for
> KPROBES_ON_FTRACE for the pre handlers.
> 
> Also, with KPROBES_ON_FTRACE, the link register may be updated by the
> pre handlers or by a registed kretprobe. Honor updated LR by restoring
> it from pt_regs, rather than from the stack save area.
> 
> Live patch and function graph continue to work fine with this change.
> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/2f59be5b970b503ca8db1cb723b155

cheers