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Date: Thu, 27 Feb 2014 11:48:00 -0000
From: "Frank Ch. Eigler" <fche@redhat.com>
To: Sandeepa Prabhu <sandeepa.prabhu@linaro.org>
Cc: systemtap@sourceware.org, William Cohen <wcohen@redhat.com>,        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,        Petr Machata <pmachata@redhat.com>, Mark Wielaard <mjw@redhat.com>,        Deepak Saxena <dsaxena@linaro.org>,        Arnd Bergmann <arnd.bergmann@linaro.org>,        "sandeepa.prabhu@linux.com" <sandeepa.prabhu@linux.com>
Subject: Re: arm64 kprobes patches
Message-ID: <20140227114827.GB31320@redhat.com>
References: <CA+b37P175OWKXcQ-4SYb+AudxOJMe3OC5csoZognNuX7MOaTyQ@mail.gmail.com> <y0mzjldal1o.fsf@fche.csb> <CA+b37P2uxMb5q4=JoU7kJkCToyLOZ2F6Sn0JcLSdy3vrRPOcvQ@mail.gmail.com>
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Hi -

On Thu, Feb 27, 2014 at 10:12:26AM +0530, Sandeepa Prabhu wrote:
> [...]
> Even on arm64, there are kernel functions that fails for kprobes,
> (example: memcpy, memset etc) that are referenced by kprobe handler
> themselves.

That is normal & fine, if "fails for kprobes" means only that the
kprobes refuse to be registered.  A failure that brings down the
kernel is much worse.

- FChE