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Date: Tue, 3 Apr 2018 22:30:10 -0700
From: tip-bot for Jiri Olsa <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
jolsa@...nel.org, kan.liang@...el.com, ak@...ux.intel.com,
mingo@...nel.org, tglx@...utronix.de, acme@...hat.com,
yao.jin@...el.com, peterz@...radead.org, hpa@...or.com
Subject: [tip:perf/urgent] tools include: Add config.h header file
Commit-ID: 6b416ebcc32c5753214d53c18ac5719c93bc340e
Gitweb: https://git.kernel.org/tip/6b416ebcc32c5753214d53c18ac5719c93bc340e
Author: Jiri Olsa <jolsa@...nel.org>
AuthorDate: Fri, 30 Mar 2018 17:27:11 +0800
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 2 Apr 2018 13:31:38 -0300
tools include: Add config.h header file
Adding IS_BUILTIN macro and its dependencies into tools world.
It's taken from kernel's include/linux/kconfig.h, which can't be taken
completely due to its kconfig dependencies.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jin Yao <yao.jin@...el.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1522402036-22915-2-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/include/tools/config.h | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/tools/include/tools/config.h b/tools/include/tools/config.h
new file mode 100644
index 000000000000..08ade7df8132
--- /dev/null
+++ b/tools/include/tools/config.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_CONFIG_H
+#define _TOOLS_CONFIG_H
+
+/* Subset of include/linux/kconfig.h */
+
+#define __ARG_PLACEHOLDER_1 0,
+#define __take_second_arg(__ignored, val, ...) val
+
+/*
+ * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
+ * these only work with boolean and tristate options.
+ */
+
+/*
+ * Getting something that works in C and CPP for an arg that may or may
+ * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
+ * we match on the placeholder define, insert the "0," for arg1 and generate
+ * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
+ * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
+ * the last step cherry picks the 2nd arg, we get a zero.
+ */
+#define __is_defined(x) ___is_defined(x)
+#define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val)
+#define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, 0)
+
+/*
+ * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
+ * otherwise. For boolean options, this is equivalent to
+ * IS_ENABLED(CONFIG_FOO).
+ */
+#define IS_BUILTIN(option) __is_defined(option)
+
+#endif /* _TOOLS_CONFIG_H */
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