linux-kernel - [PATCH sched_ext/for-6.11] sched_ext: Drop tools

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Date: Mon, 24 Jun 2024 15:58:35 -1000
From: Tejun Heo <tj@...nel.org>
To: Jon Hunter <jonathanh@...dia.com>
Cc: torvalds@...ux-foundation.org, mingo@...hat.com, peterz@...radead.org,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
	ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
	martin.lau@...nel.org, joshdon@...gle.com, brho@...gle.com,
	pjt@...gle.com, derkling@...gle.com, haoluo@...gle.com,
	dvernet@...a.com, dschatzberg@...a.com, dskarlat@...cmu.edu,
	riel@...riel.com, changwoo@...lia.com, himadrics@...ia.fr,
	memxor@...il.com, andrea.righi@...onical.com,
	joel@...lfernandes.org, linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org, kernel-team@...a.com,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: [PATCH sched_ext/for-6.11] sched_ext: Drop tools_clean target from
 the top-level Makefile

2a52ca7c9896 ("sched_ext: Add scx_simple and scx_example_qmap example
schedulers") added the tools_clean target which is triggered by mrproper.
The tools_clean target triggers the sched_ext_clean target in tools/. This
unfortunately makes mrproper fail when no BTF enabled kernel image is found:

  Makefile:83: *** Cannot find a vmlinux for VMLINUX_BTF at any of "  ../../vmlinux /sys/kernel/btf/vmlinux/boot/vmlinux-4.15.0-136-generic".  Stop.
  Makefile:192: recipe for target 'sched_ext_clean' failed
  make[2]: *** [sched_ext_clean] Error 2
  Makefile:1361: recipe for target 'sched_ext' failed
  make[1]: *** [sched_ext] Error 2
  Makefile:240: recipe for target '__sub-make' failed
  make: *** [__sub-make] Error 2

Clean targets shouldn't fail like this but also it's really odd for mrproper
to single out and trigger the sched_ext_clean target when no other clean
targets under tools/ are triggered.

Fix builds by dropping the tools_clean target from the top-level Makefile.
The offending Makefile line is shared across BPF targets under tools/. Let's
revisit them later.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Jon Hunter <jonathanh@...dia.com>
Link: http://lkml.kernel.org/r/ac065f1f-8754-4626-95db-2c9fcf02567b@nvidia.com
Fixes: 2a52ca7c9896 ("sched_ext: Add scx_simple and scx_example_qmap example schedulers")
Cc: David Vernet <void@...ifault.com>
---
Jon, this should fix it. I'll route this through sched_ext/for-6.11.

Thanks.

 Makefile |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/Makefile
+++ b/Makefile
@@ -1355,12 +1355,6 @@ ifneq ($(wildcard $(resolve_btfids_O)),)
 	$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
 endif

-tools-clean-targets := sched_ext
-PHONY += $(tools-clean-targets)
-$(tools-clean-targets):
-	$(Q)$(MAKE) -sC tools $@...ean
-tools_clean: $(tools-clean-targets)
-
 # Clear a bunch of variables before executing the submake
 ifeq ($(quiet),silent_)
 tools_silent=s
@@ -1533,7 +1527,7 @@ PHONY += $(mrproper-dirs) mrproper
 $(mrproper-dirs):
 	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

-mrproper: clean $(mrproper-dirs) tools_clean
+mrproper: clean $(mrproper-dirs)
 	$(call cmd,rmfiles)
 	@find . $(RCS_FIND_IGNORE) \
 		\( -name '*.rmeta' \) \