[PATCH] tools: perf: Fix liblk not built when using perf_install target

[Sedat Dilek]

After a successful Linux-kernel build I wanted to build only perf
as a linux-tools to do some benchmarking of the spinlock-lockref
changes together with a test-case from Linus.

I followed the advices in "tools/Makefile".

[ tools/Makefile ]
...
        @echo 'You can do:'
        @echo ' $$ make -C tools/ <tool>_install' <--- NOTE THIS ONE!
        @echo ''
        @echo '  from the kernel command line to build and install one of'
        @echo '  the tools above'
...

So, I tried to build perf the "official" way:

   $ make -C tools/ perf_install

Unfortunately, my build breaks like this:
...
make[2]: Entering directory
`~/src/linux-kernel/linux/tools/lib/traceevent'
make[2]: Leaving directory
`~/src/linux-kernel/linux/tools/lib/traceevent'
    LINK perf
gcc: error: ~/src/linux-kernel/linux/tools/lib/lk/liblk.a: No such file or directory
make[1]: *** [perf] Error 1
make[1]: Leaving directory `~/src/linux-kernel/linux/tools/perf'
make: *** [perf_install] Error 2

After some discussion on IRC with peterz and acme and a closer look at
the targets in "tools/Makefile", I have noticed that the perf_install
target misses liblk to be built beforehand.
On the contrary the perf_clean target invokes to clean liblk when perf
is cleaned.

[ tools/Makefile ]
...
perf_clean: liblk_clean
	$(call descend,$(@:_clean=),clean)
...

Fix this by adding liblk target to perf_install target.

For more details see this thread in [1]:
"[3.11-rc7] Building perf-only the "official" way seems to be BROKEN?"

[1] http://marc.info/?t=137786599400001&r=1&w=2

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
---
 tools/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/Makefile b/tools/Makefile
index 41067f3..c15f0e7 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -53,7 +53,10 @@ turbostat x86_energy_perf_policy: FORCE
 cpupower_install:
 	$(call descend,power/$(@:_install=),install)
 
-cgroup_install firewire_install lguest_install perf_install usb_install virtio_install vm_install net_install:
+cgroup_install firewire_install lguest_install usb_install virtio_install vm_install net_install:
+	$(call descend,$(@:_install=),install)
+
+perf_install: liblk
 	$(call descend,$(@:_install=),install)
 
 selftests_install:
-- 
1.8.4

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