From mboxrd@z Thu Jan  1 00:00:00 1970
From: rostedt at goodmis.org (Steven Rostedt)
Date: Mon, 6 May 2019 13:06:43 -0400
Subject: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
In-Reply-To: <CAHk-=wgw_Jmn1iJWanoSFb1QZn3mbTD_JEoMsWcWj5QPeyHZHA@mail.gmail.com>
References: <20190502181811.GY2623@hirez.programming.kicks-ass.net>
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 <20190502185225.0cdfc8bc@gandalf.local.home>
 <20190502193129.664c5b2e@gandalf.local.home>
 <20190502195052.0af473cf@gandalf.local.home>
 <20190503092959.GB2623@hirez.programming.kicks-ass.net>
 <20190503092247.20cc1ff0@gandalf.local.home>
 <2045370D-38D8-406C-9E94-C1D483E232C9@amacapital.net>
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Message-ID: <20190506130643.62c35eeb@gandalf.local.home>

On Mon, 6 May 2019 09:17:19 -0700
Linus Torvalds <torvalds at linux-foundation.org> wrote:

> So what is it that doesn't actually work? I've looked at the patch
> even more, and I can't for the life of me see how it wouldn't work.
> 
> Of course, I didn't test any of the actual ftrace parts, since I
> short-circuited them intentionally with the above test function hack.
> I have no idea what the semantics for those
> ftrace_location(ip)/is_ftrace_caller(ip) cases are supposed to be, I
> only tested that yes, the infrastructure clearly emulates a call
> instruction.

Can you try booting with:

CONFIG_KPROBE_EVENTS=y
CONFIG_UPROBE_EVENTS=y
CONFIG_DYNAMIC_EVENTS=y
CONFIG_PROBE_EVENTS=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_FUNCTION_PROFILER=y
CONFIG_FTRACE_MCOUNT_RECORD=y
CONFIG_FTRACE_SELFTEST=y
CONFIG_FTRACE_STARTUP_TEST=y
CONFIG_TRACEPOINT_BENCHMARK=y
CONFIG_RING_BUFFER_BENCHMARK=y
CONFIG_RING_BUFFER_STARTUP_TEST=y


And see if it boots?

-- Steve

From mboxrd@z Thu Jan  1 00:00:00 1970
From: rostedt@goodmis.org (Steven Rostedt)
Date: Mon, 6 May 2019 13:06:43 -0400
Subject: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
In-Reply-To: <CAHk-=wgw_Jmn1iJWanoSFb1QZn3mbTD_JEoMsWcWj5QPeyHZHA@mail.gmail.com>
References: <20190502181811.GY2623@hirez.programming.kicks-ass.net>
 <CAHk-=wi6A9tgw=kkPh5Ywqt687VvsVEjYXVkAnq0jpt0u0tk6g@mail.gmail.com>
 <20190502202146.GZ2623@hirez.programming.kicks-ass.net>
 <20190502185225.0cdfc8bc@gandalf.local.home>
 <20190502193129.664c5b2e@gandalf.local.home>
 <20190502195052.0af473cf@gandalf.local.home>
 <20190503092959.GB2623@hirez.programming.kicks-ass.net>
 <20190503092247.20cc1ff0@gandalf.local.home>
 <2045370D-38D8-406C-9E94-C1D483E232C9@amacapital.net>
 <CAHk-=wjrOLqBG1qe9C3T=fLN0m=78FgNOGOEL22gU=+Pw6Mu9Q@mail.gmail.com>
 <20190506081951.GJ2606@hirez.programming.kicks-ass.net>
 <20190506095631.6f71ad7c@gandalf.local.home>
 <CAHk-=wgw_Jmn1iJWanoSFb1QZn3mbTD_JEoMsWcWj5QPeyHZHA@mail.gmail.com>
Message-ID: <20190506130643.62c35eeb@gandalf.local.home>
Content-Type: text/plain; charset="UTF-8"
Message-ID: <20190506170643.ipmDq8UWngWtgMcD0xunxIi9BYICs9o7Qby9x1rCeX0@z>

On Mon, 6 May 2019 09:17:19 -0700
Linus Torvalds <torvalds@linux-foundation.org> wrote:

> So what is it that doesn't actually work? I've looked at the patch
> even more, and I can't for the life of me see how it wouldn't work.
> 
> Of course, I didn't test any of the actual ftrace parts, since I
> short-circuited them intentionally with the above test function hack.
> I have no idea what the semantics for those
> ftrace_location(ip)/is_ftrace_caller(ip) cases are supposed to be, I
> only tested that yes, the infrastructure clearly emulates a call
> instruction.

Can you try booting with:

CONFIG_KPROBE_EVENTS=y
CONFIG_UPROBE_EVENTS=y
CONFIG_DYNAMIC_EVENTS=y
CONFIG_PROBE_EVENTS=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_FUNCTION_PROFILER=y
CONFIG_FTRACE_MCOUNT_RECORD=y
CONFIG_FTRACE_SELFTEST=y
CONFIG_FTRACE_STARTUP_TEST=y
CONFIG_TRACEPOINT_BENCHMARK=y
CONFIG_RING_BUFFER_BENCHMARK=y
CONFIG_RING_BUFFER_STARTUP_TEST=y


And see if it boots?

-- Steve