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The powerpc perf arch port has two issues in the current 3.17-rc seriers. Undefined dwarf symbols and undefined pr_debug calls. commit a60335ba [perf tools powerpc: Adjust callchain based on DWARF debug info] introduces skip-callchain-idx.c, and breaks the perf build. Until fixes get into the mainline kernel, we temporarily fix the issues by adding a forced linke to -ldw and modifying skip-callchain-idx.c to include the proper debug files for pr_debug. (From OE-Core rev: 9f204a02f07f8e378e8a078db103a6ba94ec55cb) Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>