linux-kernel - [PATCH net-next] mm: page_frag: fix a compile error when kernel is not compiled

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Message-Id: <20241116042314.100400-1-yunshenglin0825@gmail.com>
Date: Sat, 16 Nov 2024 12:23:13 +0800
From: Yunsheng Lin <yunshenglin0825@...il.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: linyunsheng@...wei.com,
	Yunsheng Lin <yunshenglin0825@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Duyck <alexanderduyck@...com>,
	Linux-MM <linux-mm@...ck.org>,
	Mark Brown <broonie@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next] mm: page_frag: fix a compile error when kernel is not compiled

page_frag test module is an out of tree module, but built
using KDIR as the main kernel tree, the mm test suite is
just getting skipped if newly added page_frag test module
fails to compile due to kernel not yet compiled.

Fix the above problem by ensuring both kernel is built first
and a newer kernel which has page_frag_cache.h is used.

CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Alexander Duyck <alexanderduyck@...com>
CC: Linux-MM <linux-mm@...ck.org>
Fixes: 7fef0dec415c ("mm: page_frag: add a test module for page_frag")
Fixes: 65941f10caf2 ("mm: move the page fragment allocator from page_alloc into its own file")
Reported-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Yunsheng Lin <yunshenglin0825@...il.com>
---
Mote, page_frag test module is only in the net-next tree for now,
so target the net-next tree.
---
 tools/testing/selftests/mm/Makefile           | 18 ++++++++++++++++++
 tools/testing/selftests/mm/page_frag/Makefile |  2 +-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index acec529baaca..04e04733fc8a 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -36,7 +36,16 @@ MAKEFLAGS += --no-builtin-rules
 CFLAGS = -Wall -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES) $(TOOLS_INCLUDES)
 LDLIBS = -lrt -lpthread -lm
 
+KDIR ?= /lib/modules/$(shell uname -r)/build
+ifneq (,$(wildcard $(KDIR)/Module.symvers))
+ifneq (,$(wildcard $(KDIR)/include/linux/page_frag_cache.h))
 TEST_GEN_MODS_DIR := page_frag
+else
+PAGE_FRAG_WARNING = "missing page_frag_cache.h, please use a newer kernel"
+endif
+else
+PAGE_FRAG_WARNING = "missing Module.symvers, please have the kernel built first"
+endif
 
 TEST_GEN_FILES = cow
 TEST_GEN_FILES += compaction_test
@@ -214,3 +223,12 @@ warn_missing_liburing:
 	echo "Warning: missing liburing support. Some tests will be skipped." ; \
 	echo
 endif
+
+ifneq ($(PAGE_FRAG_WARNING),)
+all: warn_missing_page_frag
+
+warn_missing_page_frag:
+	@echo ; \
+	echo "Warning: $(PAGE_FRAG_WARNING). page_frag test will be skipped." ; \
+	echo
+endif
diff --git a/tools/testing/selftests/mm/page_frag/Makefile b/tools/testing/selftests/mm/page_frag/Makefile
index 58dda74d50a3..8c8bb39ffa28 100644
--- a/tools/testing/selftests/mm/page_frag/Makefile
+++ b/tools/testing/selftests/mm/page_frag/Makefile
@@ -1,5 +1,5 @@
 PAGE_FRAG_TEST_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
-KDIR ?= $(abspath $(PAGE_FRAG_TEST_DIR)/../../../../..)
+KDIR ?= /lib/modules/$(shell uname -r)/build
 
 ifeq ($(V),1)
 Q =
-- 
2.34.1