From: Mark Brown <broonie@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Miroslav Benes <mbenes@suse.cz>, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 3/3] arm64: stacktrace: Implement reliable stacktrace
Date: Tue, 13 Oct 2020 17:12:11 +0100 [thread overview]
Message-ID: <20201013161211.GB7913@sirena.org.uk> (raw)
In-Reply-To: <20201013114230.GB774@C02TD0UTHF1T.local>
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On Tue, Oct 13, 2020 at 12:42:30PM +0100, Mark Rutland wrote:
> On Mon, Oct 12, 2020 at 06:26:05PM +0100, Mark Brown wrote:
> > +/*
> > + * This function returns an error if it detects any unreliable features of the
> > + * stack. Otherwise it guarantees that the stack trace is reliable.
> > + *
> > + * If the task is not 'current', the caller *must* ensure the task is inactive.
> > + */
> Is the caller responsible for pinning a non-current task's stack? e.g.
> in dump_backtrace() we do that with try_get_task_stack(). If so, it
> might be worth making the comment say "the task is inactive and its
> stack is pinned".
Yes, this is done in the generic code by stack_trace_save_reliable()
which should be the only user of this function. TBH we should probably
move this comment to the prototype in the header rather than duplicating
it in each architecture as is currently done, I was being a bit lazy
there.
> > +int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
> > + void *cookie, struct task_struct *task)
> > +{
> > + struct stackframe frame;
> > +
> > + if (task == current)
> > + start_backtrace(&frame,
> > + (unsigned long)__builtin_frame_address(0),
> > + (unsigned long)arch_stack_walk_reliable);
> > + else
> > + start_backtrace(&frame, thread_saved_fp(task),
> > + thread_saved_pc(task));
> > +
> Codestyle nit: as these spread over multiple lines the if-else clauses
> should have braces.
Usage appears to be a bit varied there for single statements :/
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next prev parent reply other threads:[~2020-10-13 16:13 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 17:26 [RFC PATCH 0/3] arm64: Implement reliable stack trace Mark Brown
2020-10-12 17:26 ` [RFC PATCH 1/3] arm64: remove EL0 exception frame record Mark Brown
2020-10-12 17:26 ` [RFC PATCH 2/3] arm64: stacktrace: Report when we reach the end of the stack Mark Brown
2020-10-13 11:07 ` Mark Rutland
2020-10-12 17:26 ` [RFC PATCH 3/3] arm64: stacktrace: Implement reliable stacktrace Mark Brown
2020-10-13 10:42 ` Mark Brown
2020-10-13 11:42 ` Mark Rutland
2020-10-13 16:12 ` Mark Brown [this message]
2020-10-15 13:33 ` Miroslav Benes
2020-10-15 15:57 ` Mark Brown
2020-10-16 10:13 ` Miroslav Benes
2020-10-16 12:30 ` Mark Brown
2020-10-15 13:39 ` [RFC PATCH 0/3] arm64: Implement reliable stack trace Miroslav Benes
2020-10-15 14:16 ` Mark Rutland
2020-10-15 15:49 ` Mark Brown
2020-10-15 21:29 ` Josh Poimboeuf
2020-10-16 11:14 ` Mark Rutland
2020-10-20 10:03 ` Mark Rutland
2020-10-20 15:58 ` Josh Poimboeuf
2020-10-16 12:15 ` Mark Brown
2020-10-19 23:41 ` Josh Poimboeuf
2020-10-20 15:39 ` Mark Brown
2020-10-20 16:28 ` Josh Poimboeuf
2021-01-27 14:02 ` Madhavan T. Venkataraman
2021-01-27 16:40 ` Mark Rutland
2021-01-27 17:11 ` Mark Brown
2021-01-27 17:24 ` Madhavan T. Venkataraman
2021-01-27 19:54 ` Madhavan T. Venkataraman
2021-01-28 14:22 ` Mark Brown
2021-01-28 15:26 ` Josh Poimboeuf
2021-01-29 21:39 ` Madhavan T. Venkataraman
2021-02-01 3:20 ` Madhavan T. Venkataraman
2021-02-01 14:39 ` Mark Brown
2021-01-30 4:38 ` Madhavan T. Venkataraman
2021-02-01 15:21 ` Madhavan T. Venkataraman
2021-02-01 15:46 ` Madhavan T. Venkataraman
2021-02-01 16:02 ` Mark Rutland
2021-02-01 16:22 ` Mark Brown
2021-02-01 21:40 ` Madhavan T. Venkataraman
2021-02-01 21:38 ` Madhavan T. Venkataraman
2021-02-01 23:00 ` Josh Poimboeuf
2021-02-02 2:29 ` Madhavan T. Venkataraman
2021-02-02 3:36 ` Josh Poimboeuf
2021-02-02 10:05 ` Mark Rutland
2021-02-02 13:33 ` Madhavan T. Venkataraman
2021-02-02 13:35 ` Madhavan T. Venkataraman
2021-02-02 23:32 ` Madhavan T. Venkataraman
2021-02-03 16:53 ` Mark Rutland
2021-02-03 19:03 ` Madhavan T. Venkataraman
2021-02-05 2:36 ` Madhavan T. Venkataraman
2021-02-01 21:59 ` Madhavan T. Venkataraman
2021-02-02 13:36 ` Mark Brown
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