linux-kernel - Re: [PATCH v2 1/2] kconfig: fix bad syntactic transformation in expr.c

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Date:	Sat, 11 Oct 2014 21:07:23 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Martin Walch <walch.martin@....de>
Cc:	yann.morin.1998@...e.fr, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] kconfig: fix bad syntactic transformation in
 expr.c

On Mon, 2014-09-22 at 19:13 +0200, Martin Walch wrote:
> Fix it by removing expr_eliminate_dups2() and the functions that have no use
> anywhere else: expr_extract_eq_and(), expr_extract_eq_or(),
> and expr_extract_eq() from scripts/kconfig/expr.[ch]
> 
> Currently the bug is not triggered in mainline, so this patch does not modify
> the configuration space there.

Would I be whining if I'd complained about the lack of documentation for
expr_eliminate_dups(), expr_eliminate_dups1(), and
expr_eliminate_dups2()?

So, I've put in these two calls of fprintf():
@@ -579,6 +606,7 @@ static void expr_eliminate_dups2(enum expr_type type, struct expr **ep1, struct
                tmp2 = expr_copy(e2);
                tmp = expr_extract_eq_and(&tmp1, &tmp2);
                if (expr_is_yes(tmp1)) {
+                       fprintf(stderr, "%s:%d:\n", __func__, __LINE__);
                        expr_free(e1);
                        e1 = expr_alloc_symbol(&symbol_no);
                        trans_count++;
@@ -594,6 +622,7 @@ static void expr_eliminate_dups2(enum expr_type type, struct expr **ep1, struct
                tmp2 = expr_copy(e2);
                tmp = expr_extract_eq_or(&tmp1, &tmp2);
                if (expr_is_no(tmp1)) {
+                       fprintf(stderr, "%s:%d:\n", __func__, __LINE__);
                        expr_free(e1);
                        e1 = expr_alloc_symbol(&symbol_yes);
                        trans_count++;

None of the 500+ defconfig files in next-20141010 triggered those
fprintf's.

Does that means it's likely that nothing in next-20141010 actually uses
the functionality expr_eliminate_dups2() provides?


Paul Bolle

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