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Date: Thu, 8 Apr 2021 14:23:39 -0500 From: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com> To: Mark Brown <broonie@...nel.org>, mark.rutland@....com Cc: jpoimboe@...hat.com, jthierry@...hat.com, catalin.marinas@....com, will@...nel.org, linux-arm-kernel@...ts.infradead.org, live-patching@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH v2 3/4] arm64: Detect FTRACE cases that make the stack trace unreliable On 4/8/21 11:58 AM, Mark Brown wrote: > On Mon, Apr 05, 2021 at 03:43:12PM -0500, madvenka@...ux.microsoft.com wrote: >> From: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com> >> >> When CONFIG_DYNAMIC_FTRACE_WITH_REGS is enabled and tracing is activated >> for a function, the ftrace infrastructure is called for the function at >> the very beginning. Ftrace creates two frames: > > This looks good to me however I'd really like someone who has a firmer > understanding of what ftrace is doing to double check as it is entirely > likely that I am missing cases here, it seems likely that if I am > missing stuff it's extra stuff that needs to be added and we're not > actually making use of the reliability information yet. > OK. So, do you have some specific reviewer(s) in mind? Apart from yourself, Mark Rutland and Josh Poimboeuf, these are some reviewers I can think of (in alphabetical order): AKASHI Takahiro <takahiro.akashi@...aro.org> Ard Biesheuvel <ard.biesheuvel@...aro.org> Catalin Marinas <catalin.marinas@....com> Josh Poimboeuf <jpoimboe@...hat.com> Steven Rostedt (VMware) <rostedt@...dmis.org> Torsten Duwe <duwe@...e.de> Will Deacon <will@...nel.org> Sorry if I missed out any of the other experts. Thanks. Madhavan
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