linux-kernel - Re: [PATCH 2/4] tracing/hist: Call hist functions directly via a switch statement

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Date:   Tue, 6 Sep 2022 17:38:30 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: Re: [PATCH 2/4] tracing/hist: Call hist functions directly via a
 switch statement

On Mon, 5 Sep 2022 22:48:49 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> > @@ -2725,7 +2748,8 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
> >  		if (var2)
> >  			expr->operands[1] = var2;
> >  
> > -		expr->constant = op_fn(expr, NULL, NULL, NULL, NULL);
> > +		expr->fn_num = op_fn;
> > +		expr->constant = hist_fn_call(expr, NULL, NULL, NULL, NULL);
> >  
> >  		expr->operands[0] = NULL;
> >  		expr->operands[1] = NULL;  
> 
> Here, we need this;
> 
> 		expr->fn_num = HIST_FIELD_FN_CONST;
> 
> Without this fix, the binary op_fn is kept on this const field and it
> causes the problem because the const field doesn't have operands.


Yep, I added it just below the function.

Thanks, I'll send a v2 (after testing the rest of the patches).

-- Steve