From: Jim Cromie <jim.cromie@gmail.com>
Date: Mon, 19 Dec 2011 22:13:12 +0000 (-0500)
Subject: dynamic_debug: add trim_prefix() to provide source-root relative paths
X-Git-Tag: v3.4-rc1~187^2~62
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b6783191da7211c88f98eb1a2bd2027bff36e30;p=pandora-kernel.git

dynamic_debug: add trim_prefix() to provide source-root relative paths

trim_prefix(path) skips past the absolute source path root, and
returns the pointer to the relative path from there.  It is used to
shorten the displayed path in $DBGMT/dynamic_debug/control via
ddebug_proc_show(), and in ddebug_change() to allow relative filenames
to be used in applied queries.  For example:

  ~# echo file kernel/freezer.c +p > $DBGMT/dynamic_debug/control

  kernel/freezer.c:128 [freezer]cancel_freezing p "  clean up: %s\012"

trim_prefix(path) insures common prefix before trimming it, so
out-of-tree module paths are shown as full absolute paths.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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