Messages in this thread | | | Date | Thu, 1 Jul 2021 14:07:54 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH 1/2] tracing: Simplify & fix saved_tgids logic |
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On Thu, 1 Jul 2021 10:31:59 -0700 Paul Burton <paulburton@google.com> wrote:
> I was tempted to just add the redundant checks anyway (pick your battles > and all) but for show() in particular it wound up making things seem > non-sensical to me ("display the value describing this non-NULL pointer > into tgid_map only if tgid_map is not NULL?").
I agree with your assessment, and will actually take your first patch, as I don't think the comment is that helpful, not to mention, we don't use '//' comments in the kernel, so that would have to be changed.
But for cases like this, I usually have something like:
if (WARN_ON_ONCE(!tgid_map)) return -1;
Because the logic is what makes tgid_map not being NULL, but as experience has taught me, the logic can sometimes be mistaken, at least as time goes by. And things that are protected by logic, deserve a WARN*() when it doesn't go as planned.
We can always add that later, if needed.
-- Steve
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