#!/usr/bin/python """ Copyright 2008 (c) Frederic Weisbecker Licensed under the terms of the GNU GPL License version 2 This script parses a trace provided by the function tracer in kernel/trace/trace_functions.c The resulted trace is processed into a tree to produce a more human view of the call stack by drawing textual but hierarchical tree of calls. Only the functions's names and the the call time are provided. Usage: Be sure that you have CONFIG_FUNCTION_TRACER # mount -t debugfs nodev /sys/kernel/debug # echo function > /sys/kernel/debug/tracing/current_tracer $ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func Wait some times but not too much, the script is a bit slow. Break the pipe (Ctrl + Z) $ scripts/draw_functrace.py < raw_trace_func > draw_functrace Then you have your drawn trace in draw_functrace """ import sys, re class CallTree: """ This class provides a tree representation of the functions call stack. If a function has no parent in the kernel (interrupt, syscall, kernel thread...) then it is attached to a virtual parent called ROOT. """ ROOT = None def __init__(self, func, time = None, parent = None): self._func = func self._time = time if parent is None: self._parent = CallTree.ROOT else: self._parent = parent self._children = [] def calls(self, func, calltime): """ If a function calls another one, call this method to insert it into the tree at the appropriate place. @return: A reference to the newly created child node. """ child = CallTree(func, calltime, self) self._children.append(child) return child def getParent(self, func): """ Retrieve the last parent of the current node that has the name given by func. If this function is not on a parent, then create it as new child of root @return: A reference to the parent. """ tree = self while tree != CallTree.ROOT and tree._func != func: tree = tree._parent if tree == CallTree.ROOT: child = CallTree.ROOT.calls(func, None) return child return tree def __repr__(self): return self.__toString("", True) def __toString(self, branch, lastChild): if self._time is not None: s = "%s----%s (%s)\n" % (branch, self._func, self._time) else: s = "%s----%s\n" % (branch, self._func) i = 0 if lastChild: branch = branch[:-1] + " " while i < len(self._children): if i != len(self._children) - 1: s += "%s" % self._children[i].__toString(branch +\ " |", False) else: s += "%s" % self._children[i].__toString(branch +\ " |", True) i += 1 return s class BrokenLineException(Exception): """If the last line is not complete because of the pipe breakage, we want to stop the processing and ignore this line. """ pass class CommentLineException(Exception): """ If the line is a comment (as in the beginning of the trace file), just ignore it. """ pass def parseLine(line): line = line.strip() if line.startswith("#"): raise CommentLineException m = re.match("[^]]+?\\] +([0-9.]+): (\\w+) <-(\\w+)", line) if m is None: raise BrokenLineException return (m.group(1), m.group(2), m.group(3)) def main(): CallTree.ROOT = CallTree("Root (Nowhere)", None, None) tree = CallTree.ROOT for line in sys.stdin: try: calltime, callee, caller = parseLine(line) except BrokenLineException: break except CommentLineException: continue tree = tree.getParent(caller) tree = tree.calls(callee, calltime) print CallTree.ROOT if __name__ == "__main__": main() ue='4'>4space:mode:
authorLinus Walleij <linus.walleij@linaro.org>2016-11-12 15:22:38 +0100
committerMark Brown <broonie@kernel.org>2016-11-13 09:22:37 +0000
commit295070e9aa015abb9b92cccfbb1e43954e938133 (patch)
treed0a08e7ce280bc877e22424437dbe59fa1857d9a /net/ieee802154/header_ops.c
parent1001354ca34179f3db924eb66672442a173147dc (diff)
regulator: stw481x-vmmc: fix ages old enable error
The regulator has never been properly enabled, it has been dormant all the time. It's strange that MMC was working at all, but it likely worked by the signals going through the levelshifter and reaching the card anyways. Fixes: 3615a34ea1a6 ("regulator: add STw481x VMMC driver") Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'net/ieee802154/header_ops.c')