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Date: Sat, 21 Jun 2008 23:47:15 +0530 From: Abhishek Sagar <sagar.abhishek@...il.com> To: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu> CC: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org> Subject: [PATCH 0/4] ftrace: prevent ftrace modifications while being kprobe'd Hi Steven/Ingo, These patches address the problem of kprobe registration interfering with dynamic ftrace. A kprobe registered on an mcount call-site can modify that address multiple times during its duration of probing. At the same time, ftrace may simultaneously modify these locations. This could be fatal especially if ftrace modifies the call-site during a kprobe registration on it (between arch_prepare_kprobe and arch_arm_kprobe in __register_kprobe to be more precise). So as a "fix", I've disabled any updates on the mcount call-site while it's being kprobe'd. -- Regards, Abhishek Sagar -- 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/
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