[Add] 打通Kconfiglib配置操作

scripts/kconfig/Kconfiglib/examples/find_symbol.py

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+# Prints all menu nodes that reference a given symbol any of their properties
+# or property conditions, along with their parent menu nodes.
+#
+# Usage:
+#
+#   $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/find_symbol.py SCRIPT_ARG=<name>
+#
+# Example output for SCRIPT_ARG=X86:
+#
+#   Found 470 locations that reference X86:
+#
+#   ========== Location 1 (init/Kconfig:1108) ==========
+#
+#   config SGETMASK_SYSCALL
+#   	bool
+#   	prompt "sgetmask/ssetmask syscalls support" if EXPERT
+#   	default PARISC || M68K || PPC || MIPS || X86 || SPARC || MICROBLAZE || SUPERH
+#   	help
+#   	  sys_sgetmask and sys_ssetmask are obsolete system calls
+#   	  no longer supported in libc but still enabled by default in some
+#   	  architectures.
+#
+#   	  If unsure, leave the default option here.
+#
+#   ---------- Parent 1 (init/Kconfig:1077)  ----------
+#
+#   menuconfig EXPERT
+#   	bool
+#   	prompt "Configure standard kernel features (expert users)"
+#   	select DEBUG_KERNEL
+#   	help
+#   	  This option allows certain base kernel options and settings
+#   	  to be disabled or tweaked. This is for specialized
+#   	  environments which can tolerate a "non-standard" kernel.
+#   	  Only use this if you really know what you are doing.
+#
+#   ---------- Parent 2 (init/Kconfig:39)  ----------
+#
+#   menu "General setup"
+#
+#   ========== Location 2 (arch/Kconfig:29) ==========
+#
+#   config OPROFILE_EVENT_MULTIPLEX
+#   	bool
+#   	prompt "OProfile multiplexing support (EXPERIMENTAL)"
+#   	default "n"
+#   	depends on OPROFILE && X86
+#   	help
+#   	  The number of hardware counters is limited. The multiplexing
+#   	  feature enables OProfile to gather more events than counters
+#   	  are provided by the hardware. This is realized by switching
+#   	  between events at a user specified time interval.
+#
+#   	  If unsure, say N.
+#
+#   ---------- Parent 1 (arch/Kconfig:16)  ----------
+#
+#   config OPROFILE
+#   	tristate
+#   	prompt "OProfile system profiling"
+#   	select RING_BUFFER
+#   	select RING_BUFFER_ALLOW_SWAP
+#   	depends on PROFILING && HAVE_OPROFILE
+#   	help
+#   	  OProfile is a profiling system capable of profiling the
+#   	  whole system, include the kernel, kernel modules, libraries,
+#   	  and applications.
+#
+#   	  If unsure, say N.
+#
+#   ---------- Parent 2 (init/Kconfig:39)  ----------
+#
+#   menu "General setup"
+#
+#   ... (tons more)
+
+import sys
+
+import kconfiglib
+
+
+if len(sys.argv) < 3:
+    sys.exit('Pass symbol name (without "CONFIG_" prefix) with SCRIPT_ARG=<name>')
+
+kconf = kconfiglib.Kconfig(sys.argv[1])
+sym_name = sys.argv[2]
+if sym_name not in kconf.syms:
+    print("No symbol {} exists in the configuration".format(sym_name))
+    sys.exit(0)
+
+referencing = [node for node in kconf.node_iter()
+               if kconf.syms[sym_name] in node.referenced]
+if not referencing:
+    print("No references to {} found".format(sym_name))
+    sys.exit(0)
+
+print("Found {} locations that reference {}:\n"
+      .format(len(referencing), sym_name))
+
+for i, node in enumerate(referencing, 1):
+    print("========== Location {} ({}:{}) ==========\n\n{}"
+          .format(i, node.filename, node.linenr, node))
+
+    # Print the parents of the menu node too
+
+    node = node.parent
+    parent_i = 1
+    while node is not kconf.top_node:
+        print("---------- Parent {} ({}:{})  ----------\n\n{}"
+              .format(parent_i, node.filename, node.linenr, node))
+        node = node.parent
+        parent_i += 1