linux-kernel - Re: [PATCH -v4 9/9] tracing: add function graph tracer support for MIPS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1256234428.20866.797.camel@gandalf.stny.rr.com>
Date:	Thu, 22 Oct 2009 14:00:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	wuzhangjin@...il.com, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, Thomas Gleixner <tglx@...utronix.de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Nicholas Mc Guire <der.herr@...r.at>
Subject: Re: [PATCH -v4 9/9] tracing: add function graph tracer support for
 MIPS

On Thu, 2009-10-22 at 09:16 -0700, David Daney wrote:
> Steven Rostedt wrote:

> > Functions that run off into another function?? I guess the compiler
> > could do that, but with -pg enable, I would think is broken.
> > 
> 
> Use of GCC-4.5's __builtin_unreachable() can lead to this, as well as 
> functions that call noreturn functions.

But still. Should that unreachable code have a "save ra to stack"? If
not, this method is still safe.

-- Steve


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/