c3314a74f8
Commit800d3f5616("perf report: Add warning when libunwind not compiled in") breaks the s390 platform. S390 uses libdw-dwarf-unwind for call chain unwinding and had no support for libunwind. So the warning "Please install libunwind development packages during the perf build." caused the confusion even if the call-graph is displayed correctly. This patch adds checking for HAVE_DWARF_SUPPORT, which is set when libdw-dwarf-unwind is compiled in. Fixes:800d3f5616("perf report: Add warning when libunwind not compiled in") Signed-off-by: Jin Yao <yao.jin@linux.intel.com> Reviewed-by: Thomas Richter <tmricht@linux.ibm.com> Tested-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jin Yao <yao.jin@intel.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20200107191745.18415-1-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.