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From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
To: Mark Brown <broonie@kernel.org>
Cc: mark.rutland@arm.com, jpoimboe@redhat.com, jthierry@redhat.com,
	catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v1 1/4] arm64: Implement infrastructure for stack trace reliability checks
Date: Thu, 1 Apr 2021 12:44:53 -0500	[thread overview]
Message-ID: <ecdca67a-223f-40de-ebfa-89183e15a2a8@linux.microsoft.com> (raw)
In-Reply-To: <20210401152741.GK4758@sirena.org.uk>



On 4/1/21 10:27 AM, Mark Brown wrote:
> On Tue, Mar 30, 2021 at 02:09:52PM -0500, madvenka@linux.microsoft.com wrote:
>> From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
>>
>> Implement a check_reliability() function that will contain checks for the
>> presence of various features and conditions that can render the stack trace
>> unreliable.
> 
> This looks good to me with one minor stylistic thing:
> 
>> +/*
>> + * Special functions where the stack trace is unreliable.
>> + */
>> +static struct function_range	special_functions[] = {
>> +	{ 0, 0 }
>> +};
> 
> Might be good to put a comment here saying that this is terminating the
> list rather than detecting a NULL function pointer:
> 
> 	{ /* sentinel */ }
> 
> is a common idiom for that.
> 
> Given that it's a fixed array we could also...
> 
>> +	for (func = special_functions; func->start; func++) {
>> +		if (pc >= func->start && pc < func->end)
> 
> ...do these as
> 
> 	for (i = 0; i < ARRAY_SIZE(special_functions); i++) 
> 
> so you don't need something like that, though that gets awkward when you
> have to write out special_functions[i].field a lot.
> 
> So many different potential colours for the bikeshed!
I will make the above changes.

Thanks!

Madhavan

  reply	other threads:[~2021-04-01 17:55 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <77bd5edeea72d44533c769b1e8c0fea7a9d7eb3a>
2021-03-30 19:09 ` [RFC PATCH v1 0/4] arm64: Implement " madvenka
2021-03-30 19:09   ` [RFC PATCH v1 1/4] arm64: Implement infrastructure for " madvenka
2021-04-01 15:27     ` Mark Brown
2021-04-01 17:44       ` Madhavan T. Venkataraman [this message]
2021-03-30 19:09   ` [RFC PATCH v1 2/4] arm64: Mark a stack trace unreliable if an EL1 exception frame is detected madvenka
2021-04-01 17:21     ` Mark Brown
2021-03-30 19:09   ` [RFC PATCH v1 3/4] arm64: Detect FTRACE cases that make the stack trace unreliable madvenka
2021-04-01 14:27     ` Mark Brown
2021-04-01 17:43       ` Madhavan T. Venkataraman
2021-04-01 18:28         ` Mark Brown
2021-04-01 18:40           ` Madhavan T. Venkataraman
2021-04-01 18:53             ` Madhavan T. Venkataraman
2021-04-01 19:47               ` Madhavan T. Venkataraman
2021-04-06 11:02                 ` Mark Brown
2021-04-01 17:48       ` Madhavan T. Venkataraman
2021-03-30 19:09   ` [RFC PATCH v1 4/4] arm64: Mark stack trace as unreliable if kretprobed functions are present madvenka
2021-04-01 17:23     ` Mark Brown
2021-04-03 17:01   ` [RFC PATCH v1 0/4] arm64: Implement stack trace reliability checks Josh Poimboeuf
2021-04-04  3:29     ` Madhavan T. Venkataraman
2021-04-05 13:24       ` Masami Hiramatsu
2021-04-05 13:46         ` Madhavan T. Venkataraman
2021-04-05 14:56         ` Madhavan T. Venkataraman
2021-04-05 17:12           ` Madhavan T. Venkataraman
2021-04-05 23:39             ` Masami Hiramatsu
2021-04-05 23:40           ` Masami Hiramatsu

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