linux-kernel - Re: [PATCH v4 01/15] stacktrace/x86: add function for detecting reliable stack traces

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Date:   Fri, 27 Jan 2017 09:47:08 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     Jessica Yu <jeyu@...hat.com>, Jiri Kosina <jikos@...nel.org>,
        Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        Vojtech Pavlik <vojtech@...e.com>, Jiri Slaby <jslaby@...e.cz>,
        Chris J Arges <chris.j.arges@...onical.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Balbir Singh <bsingharora@...il.com>
Subject: Re: [PATCH v4 01/15] stacktrace/x86: add function for detecting
 reliable stack traces


> diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
> index 0a34489..8e8b67b 100644
> --- a/include/linux/stacktrace.h
> +++ b/include/linux/stacktrace.h
> @@ -18,6 +18,8 @@ extern void save_stack_trace_regs(struct pt_regs *regs,
>  				  struct stack_trace *trace);
>  extern void save_stack_trace_tsk(struct task_struct *tsk,
>  				struct stack_trace *trace);
> +extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
> +					 struct stack_trace *trace);
>  
>  extern void print_stack_trace(struct stack_trace *trace, int spaces);
>  extern int snprint_stack_trace(char *buf, size_t size,
> @@ -29,12 +31,12 @@ extern void save_stack_trace_user(struct stack_trace *trace);
>  # define save_stack_trace_user(trace)              do { } while (0)
>  #endif
>  
> -#else
> +#else /* !CONFIG_STACKTRACE */
>  # define save_stack_trace(trace)			do { } while (0)
>  # define save_stack_trace_tsk(tsk, trace)		do { } while (0)
>  # define save_stack_trace_user(trace)			do { } while (0)
>  # define print_stack_trace(trace, spaces)		do { } while (0)
>  # define snprint_stack_trace(buf, size, trace, spaces)	do { } while (0)

Is there a reason you did not define empty save_stack_trace_tsk_reliable() 
here? Right, it should not be needed now as livepatching is the only user, 
but still.

Miroslav