linux-kernel - Re: [PATCH 2/3] perf, expr: Remove assert usage

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Date:   Tue, 24 Sep 2019 09:44:07 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/3] perf, expr: Remove assert usage

On Mon, Sep 23, 2019 at 04:33:38PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> My "compile perf statically" setup doesn't like this assert
> for unknown reasons. Replace it with a standard BUG_ON
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/expr.y | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index f9a20a39b64a..5086a941295a 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -6,7 +6,6 @@
>  #define IN_EXPR_Y 1
>  #include "expr.h"
>  #include "smt.h"
> -#include <assert.h>
>  #include <string.h>
>  
>  #define MAXIDLEN 256
> @@ -172,7 +171,8 @@ static int expr__lex(YYSTYPE *res, const char **pp)
>  void expr__add_id(struct parse_ctx *ctx, const char *name, double val)
>  {
>  	int idx;
> -	assert(ctx->num_ids < MAX_PARSE_ID);
> +
> +	BUG_ON(ctx->num_ids >= MAX_PARSE_ID);

hi,
getting compilation fail

  LINK     perf
/usr/bin/ld: perf-in.o: in function `expr__add_id':
/home/jolsa/kernel/linux-perf/tools/perf/util/expr.y:175: undefined reference to `BUG_ON'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile.perf:609: perf] Error 1
make[1]: *** [Makefile.perf:221: sub-make] Error 2
make: *** [Makefile:70: all] Error 2

jirka

>  	idx = ctx->num_ids++;
>  	ctx->ids[idx].name = name;
>  	ctx->ids[idx].val = val;
> -- 
> 2.21.0
>