linux/tools/build, branch v4.8

perf build: Add sdt feature detection

2016-07-14T02:09:09Z

This checks whether sys/sdt.h is available or not, which is required for DTRACE_PROBE(). We can disable this feature by passing NO_SDT=1 when building. This flag will be used for SDT test case and further SDT events in perftools. Signed-off-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: Brendan Gregg Cc: Hemant Kumar Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/146831795615.17065.17513820540591053933.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add feature detection for gelf_getnote()

2016-07-12T18:20:41Z

That is not present on some libelf implementations, such as the one used in Alpine Linux: libelf-0.8.13. This ends up disabling the SDT code, that relies on this function. One alternative would be to provide an weak fallback implementation or the open coded variant used by the buildid sysfs notes reading code. Cc: Adrian Hunter Cc: Ananth N Mavinakayanahalli Cc: Brendan Gregg Cc: David Ahern Cc: Hemant Kumar Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-82lh22ybedy9b9lych8xj12g@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf build: Add feature detection for libelf's elf_getshdrstrndx()

2016-07-04T22:38:59Z

That appeared after 0.140, and will be used in the SDT code, so, to avoid bisection break on older systems, add a feature detection and provide a stub with a pr_debug() to keep it building. Cc: Ananth N Mavinakayanahalli Cc: Brendan Gregg Cc: Hemant Kumar Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/n/tip-80y0eldgweorqnwha9rvfxjr@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

2016-05-27T05:01:22Z

Pull kbuild updates from Michal Marek: - new option CONFIG_TRIM_UNUSED_KSYMS which does a two-pass build and unexports symbols which are not used in the current config [Nicolas Pitre] - several kbuild rule cleanups [Masahiro Yamada] - warning option adjustments for gcov etc [Arnd Bergmann] - a few more small fixes * 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (31 commits) kbuild: move -Wunused-const-variable to W=1 warning level kbuild: fix if_change and friends to consider argument order kbuild: fix adjust_autoksyms.sh for modules that need only one symbol kbuild: fix ksym_dep_filter when multiple EXPORT_SYMBOL() on the same line gcov: disable -Wmaybe-uninitialized warning gcov: disable tree-loop-im to reduce stack usage gcov: disable for COMPILE_TEST Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES Kbuild: change CC_OPTIMIZE_FOR_SIZE definition kbuild: forbid kernel directory to contain spaces and colons kbuild: adjust ksym_dep_filter for some cmd_* renames kbuild: Fix dependencies for final vmlinux link kbuild: better abstract vmlinux sequential prerequisites kbuild: fix call to adjust_autoksyms.sh when output directory specified kbuild: Get rid of KBUILD_STR kbuild: rename cmd_as_s_S to cmd_cpp_s_S kbuild: rename cmd_cc_i_c to cmd_cpp_i_c kbuild: drop redundant "PHONY += FORCE" kbuild: delete unnecessary "@:" kbuild: mark help target as PHONY ...

perf build: Add build-test for debug-frame on arm/arm64

2016-05-11T15:24:58Z

Debug-frame for remote platforms is not related to the host platform, so we should test each platform separately. Signed-off-by: He Kuang Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: David Ahern Cc: Ekaterina Tumanova Cc: Josh Poimboeuf Cc: Kan Liang Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Sukadev Bhattiprolu Cc: Wang Nan Link: http://lkml.kernel.org/r/1462866037-30382-5-git-send-email-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

perf build: Add build-test for libunwind cross-platforms support

2016-05-11T15:24:58Z

Currently only test for local libunwind. We should check all supported platforms so we can use them to parse perf.data with callchain info on different machines. Signed-off-by: He Kuang Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: David Ahern Cc: Ekaterina Tumanova Cc: Josh Poimboeuf Cc: Kan Liang Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Sukadev Bhattiprolu Cc: Wang Nan Link: http://lkml.kernel.org/r/1462866037-30382-4-git-send-email-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

bpf tools: Fix syscall argument

2016-04-28T12:58:57Z

Coverity flagged this under CID 1354884 as a sizeof mismatch, it turns out that the argument "attr" passed to syscall should have been a pointer to attr in the first place. Reported-by: coverity (CID 1354884) Signed-off-by: Florian Fainelli Acked-by: Alexei Starovoitov Acked-by: Wang Nan Cc: Jiri Olsa Fixes: 8f9e05fb298f ("perf tools: Fix PowerPC native building") Link: http://lkml.kernel.org/r/1461551694-5512-3-git-send-email-f.fainelli@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

bpf tools: Remove expression with no effect

2016-04-28T12:58:57Z

Assigning "attr" to "attr" does not have any effect, but was caught by Coverity, so let's remove this. Reported-by: coverity (CID 1354720) Signed-off-by: Florian Fainelli Tested-by: Wang Nan Acked-by: Alexei Starovoitov Cc: Jiri Olsa Fixes: 1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature check") Link: http://lkml.kernel.org/r/1461551694-5512-2-git-send-email-f.fainelli@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

kbuild: rename cmd_cc_i_c to cmd_cpp_i_c

2016-04-20T08:48:19Z

This command just preprocesses .c files into .i files, so cmd_cpp_i_c seems more suitable. Signed-off-by: Masahiro Yamada Acked-by: Arnaldo Carvalho de Melo Signed-off-by: Michal Marek

perf probe: Check if dwarf_getlocations() is available

2016-04-06T13:44:28Z

If not, tell the user that: config/Makefile:273: Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157 And return -ENOTSUPP in die_get_var_range(), failing features that need it, like the one pointed out above. This fixes the build on older systems, such as Ubuntu 12.04.5. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Vinson Lee Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-9l7luqkq4gfnx7vrklkq4obs@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo