linux-kernel - [PATCH v2 1/3] kconfig: error out when seeing recursive dependency

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Date:   Wed, 15 Aug 2018 14:59:43 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Sam Ravnborg <sam@...nborg.org>,
        Dirk Gouders <dirk@...ders.net>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] kconfig: error out when seeing recursive dependency

Originally, recursive dependency was a fatal error for Kconfig
because Kconfig cannot compute symbol values in such a situation.

Commit d595cea62403 ("kconfig: print more info when we see a recursive
dependency") changed it to a warning, which I guess was not intentional.

Get it back to an error again.

Also, rename the unit test directory "warn_recursive_dep" to
"err_recursive_dep" so that it matches to the behavior.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v2:
 - Newly added

 scripts/kconfig/symbol.c                                       |  3 ---
 .../tests/{warn_recursive_dep => err_recursive_dep}/Kconfig    |  0
 scripts/kconfig/tests/err_recursive_dep/__init__.py            | 10 ++++++++++
 .../{warn_recursive_dep => err_recursive_dep}/expected_stderr  |  0
 scripts/kconfig/tests/warn_recursive_dep/__init__.py           |  9 ---------
 5 files changed, 10 insertions(+), 12 deletions(-)
 rename scripts/kconfig/tests/{warn_recursive_dep => err_recursive_dep}/Kconfig (100%)
 create mode 100644 scripts/kconfig/tests/err_recursive_dep/__init__.py
 rename scripts/kconfig/tests/{warn_recursive_dep => err_recursive_dep}/expected_stderr (100%)
 delete mode 100644 scripts/kconfig/tests/warn_recursive_dep/__init__.py

diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 4ec8b1f..688f487 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -1248,9 +1248,6 @@ struct symbol *sym_check_deps(struct symbol *sym)
 		sym->flags &= ~SYMBOL_CHECK;
 	}
 
-	if (sym2 && sym2 == sym)
-		sym2 = NULL;
-
 	return sym2;
 }
 
diff --git a/scripts/kconfig/tests/warn_recursive_dep/Kconfig b/scripts/kconfig/tests/err_recursive_dep/Kconfig
similarity index 100%
rename from scripts/kconfig/tests/warn_recursive_dep/Kconfig
rename to scripts/kconfig/tests/err_recursive_dep/Kconfig
diff --git a/scripts/kconfig/tests/err_recursive_dep/__init__.py b/scripts/kconfig/tests/err_recursive_dep/__init__.py
new file mode 100644
index 0000000..5f3821b
--- /dev/null
+++ b/scripts/kconfig/tests/err_recursive_dep/__init__.py
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+"""
+Detect recursive dependency error.
+
+Recursive dependency should be treated as an error.
+"""
+
+def test(conf):
+    assert conf.oldaskconfig() == 1
+    assert conf.stderr_contains('expected_stderr')
diff --git a/scripts/kconfig/tests/warn_recursive_dep/expected_stderr b/scripts/kconfig/tests/err_recursive_dep/expected_stderr
similarity index 100%
rename from scripts/kconfig/tests/warn_recursive_dep/expected_stderr
rename to scripts/kconfig/tests/err_recursive_dep/expected_stderr
diff --git a/scripts/kconfig/tests/warn_recursive_dep/__init__.py b/scripts/kconfig/tests/warn_recursive_dep/__init__.py
deleted file mode 100644
index adb2195..0000000
--- a/scripts/kconfig/tests/warn_recursive_dep/__init__.py
+++ /dev/null
@@ -1,9 +0,0 @@
-"""
-Warn recursive inclusion.
-
-Recursive dependency should be warned.
-"""
-
-def test(conf):
-    assert conf.oldaskconfig() == 0
-    assert conf.stderr_contains('expected_stderr')
-- 
2.7.4