linux-kernel - Re: [PATCH v3 1/2] tracing: support "bool" type in synthetic trace events

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Message-ID: <alpine.DEB.2.23.453.2010131241400.2883230@chino.kir.corp.google.com>
Date:   Tue, 13 Oct 2020 12:41:54 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michel Lespinasse <walken@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Jann Horn <jannh@...gle.com>,
        Chinwen Chang <chinwen.chang@...iatek.com>,
        Yafang Shao <laoar.shao@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 1/2] tracing: support "bool" type in synthetic trace
 events

On Fri, 9 Oct 2020, Axel Rasmussen wrote:

> It's common [1] to define tracepoint fields as "bool" when they contain
> a true / false value. Currently, defining a synthetic event with a
> "bool" field yields EINVAL. It's possible to work around this by using
> e.g. u8 (assuming sizeof(bool) is 1, and bool is unsigned; if either of
> these properties don't match, you get EINVAL [2]).
> 
> Supporting "bool" explicitly makes hooking this up easier and more
> portable for userspace.
> 
> [1]: grep -r "bool" include/trace/events/
> [2]: check_synth_field() in kernel/trace/trace_events_hist.c
> 
> Acked-by: Michel Lespinasse <walken@...gle.com>
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>

Acked-by: David Rientjes <rientjes@...gle.com>