perf top: Filter symbols based on __map__is_kernel(map)
Instead of using dso->kernel, this is equivalent at the moment, and helps in reducing the accesses to dso->kernel. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-1pc2v63iphtifovw3bv0bo1v@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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