[EXTERNAL] Re: [PATCH v2 3/3] trace: fix undefined behavior in register

[Sunil Kumar Kori]

Hi David,

I will look into this at earliest and provide feedback.

Thanks

From: David Marchand <david.marchand at redhat.com>
Sent: Friday, February 7, 2025 2:20 PM
To: Jerin Jacob <jerinj at marvell.com>; Sunil Kumar Kori <skori at marvell.com>
Cc: dev at dpdk.org; Chengwen Feng <fengchengwen at huawei.com>; Kevin Laatz <kevin.laatz at intel.com>; Bruce Richardson <bruce.richardson at intel.com>; Tyler Retzlaff <roretzla at linux.microsoft.com>; Andre Muezerie <andremue at linux.microsoft.com>; Thomas Monjalon <thomas at monjalon.net>; Stephen Hemminger <stephen at networkplumber.org>
Subject: [EXTERNAL] Re: [PATCH v2 3/3] trace: fix undefined behavior in register

Hello Jerin, Sunil, On Thu, Jan 30, 2025 at 3: 59 PM David Marchand <david. marchand@ redhat. com> wrote: > > Registering a tracepoint handler was resulting so far in undefined > behavior at runtime. > > The RTE_TRACE_POINT_REGISTER()


Hello Jerin, Sunil,



On Thu, Jan 30, 2025 at 3:59 PM David Marchand

<david.marchand at redhat.com<mailto:david.marchand at redhat.com>> wrote:

>

> Registering a tracepoint handler was resulting so far in undefined

> behavior at runtime.

>

> The RTE_TRACE_POINT_REGISTER() macro was casting the tracepoint handler

> (which expects arguments) to a void (*)(void).

> At runtime, calling this handler while registering resulted in

> reading the current stack with no relation to this function prototype.

>

> Instead, declare an additional inline _register() handler for each

> tracepoint and make sure that the emitting macros in

> rte_trace_point_register.h only work on arguments name and type.

>

> The original tracepoint handler prototype is adjusted by adding a

> __rte_unused for each argument (since emitting macros do nothing

> with them).

> This last part introduces an implementation limit of 15 arguments.

>

> With this change in place, the workaround in dmadev tracepoints can be

> removed.

>

> Signed-off-by: David Marchand <david.marchand at redhat.com<mailto:david.marchand at redhat.com>>



Can I have your opinion and review on this patch?



Thanks.





--

David Marchand


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