[PATCH ] Fix perf_install build when a separate output directory (O=) is used

[Martin Habets]

Before this patch
 make tools/perf_install
would fail as it was wrongly trying to check for directory
 $(O)/tools/perf/tools/perf/

As the original patch states, the perf build does not follow the descend
function setup, so it needs invoking it via it's own make rule.
This is also true for the install build target of perf.

Fixes: 16671c1 ("tools build: Fix Makefile(s) to properly invoke tools build")
Signed-off-by: Martin Habets <errandir_news@xxxxxxxxxxxxxxxxx>
---
 tools/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/Makefile b/tools/Makefile
index d6f307d..6f88a13 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -77,13 +77,16 @@ tmon: FORCE
 freefall: FORCE
 	$(call descend,laptop/$@)
 
+perf_install: FORCE
+	$(Q)$(MAKE) --no-print-directory -C perf O=$(PERF_O) subdir= install
+
 acpi_install:
 	$(call descend,power/$(@:_install=),install)
 
 cpupower_install:
 	$(call descend,power/$(@:_install=),install)
 
-cgroup_install firewire_install hv_install lguest_install perf_install usb_install virtio_install vm_install net_install:
+cgroup_install firewire_install hv_install lguest_install usb_install virtio_install vm_install net_install:
 	$(call descend,$(@:_install=),install)
 
 selftests_install:
-- 
1.9.1

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