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cgroup: selftests: Move cgroup_util into its own library

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KVM selftests will soon need to use some of the cgroup creation and
deletion functionality from cgroup_util.

Suggested-by: David Matlack <dmatlack@google.com>
Signed-off-by: James Houghton <jthoughton@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20250508184649.2576210-5-jthoughton@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
James Houghton
2025-05-08 18:46:45 +00:00
committed by Sean Christopherson
parent 3a7f9e518c
commit 2c754a84ff
4 changed files with 33 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
tools/testing/selftests/cgroup/Makefile
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@@ -21,14 +21,15 @@ TEST_GEN_PROGS += test_zswap
LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
include ../lib.mk
include lib/libcgroup.mk
$(OUTPUT)/test_core: cgroup_util.c
$(OUTPUT)/test_cpu: cgroup_util.c
$(OUTPUT)/test_cpuset: cgroup_util.c
$(OUTPUT)/test_freezer: cgroup_util.c
$(OUTPUT)/test_hugetlb_memcg: cgroup_util.c
$(OUTPUT)/test_kill: cgroup_util.c
$(OUTPUT)/test_kmem: cgroup_util.c
$(OUTPUT)/test_memcontrol: cgroup_util.c
$(OUTPUT)/test_pids: cgroup_util.c
$(OUTPUT)/test_zswap: cgroup_util.c
$(OUTPUT)/test_core: $(LIBCGROUP_O)
$(OUTPUT)/test_cpu: $(LIBCGROUP_O)
$(OUTPUT)/test_cpuset: $(LIBCGROUP_O)
$(OUTPUT)/test_freezer: $(LIBCGROUP_O)
$(OUTPUT)/test_hugetlb_memcg: $(LIBCGROUP_O)
$(OUTPUT)/test_kill: $(LIBCGROUP_O)
$(OUTPUT)/test_kmem: $(LIBCGROUP_O)
$(OUTPUT)/test_memcontrol: $(LIBCGROUP_O)
$(OUTPUT)/test_pids: $(LIBCGROUP_O)
$(OUTPUT)/test_zswap: $(LIBCGROUP_O)

2
tools/testing/selftests/cgroup/cgroup_util.c → tools/testing/selftests/cgroup/lib/cgroup_util.c
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@@ -17,7 +17,7 @@
#include <unistd.h>
#include "cgroup_util.h"
#include "../clone3/clone3_selftests.h"
#include "../../clone3/clone3_selftests.h"
/* Returns read len on success, or -errno on failure. */
ssize_t read_text(const char *path, char *buf, size_t max_len)

4
tools/testing/selftests/cgroup/cgroup_util.h → tools/testing/selftests/cgroup/lib/include/cgroup_util.h
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@@ -2,9 +2,9 @@
#include <stdbool.h>
#include <stdlib.h>
#include "../kselftest.h"
#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#endif
#define MB(x) (x << 20)

19
tools/testing/selftests/cgroup/lib/libcgroup.mk Normal file
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@@ -0,0 +1,19 @@
CGROUP_DIR := $(selfdir)/cgroup
LIBCGROUP_C := lib/cgroup_util.c
LIBCGROUP_O := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBCGROUP_C))
LIBCGROUP_O_DIRS := $(shell dirname $(LIBCGROUP_O) | uniq)
CFLAGS += -I$(CGROUP_DIR)/lib/include
EXTRA_HDRS := $(selfdir)/clone3/clone3_selftests.h
$(LIBCGROUP_O_DIRS):
mkdir -p $@
$(LIBCGROUP_O): $(OUTPUT)/%.o : $(CGROUP_DIR)/%.c $(EXTRA_HDRS) $(LIBCGROUP_O_DIRS)
$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
EXTRA_CLEAN += $(LIBCGROUP_O)