[PATCH v3] mm, thp: propagation of conditional compilation in khugepaged.c

["Jérémy Lefaure" <jeremy.lefaure@lse.epita.fr>]

Commit b46e756f5e47 ("thp: extract khugepaged from mm/huge_memory.c")
moved code from huge_memory.c to khugepaged.c. Some of this code should
be compiled only when CONFIG_SYSFS is enabled but the condition around
this code was not moved into khugepaged.c. The result is a compilation
error when CONFIG_SYSFS is disabled:

mm/built-in.o: In function `khugepaged_defrag_store':
khugepaged.c:(.text+0x2d095): undefined reference to
`single_hugepage_flag_store'
mm/built-in.o: In function `khugepaged_defrag_show':
khugepaged.c:(.text+0x2d0ab): undefined reference to
`single_hugepage_flag_show'

This commit adds the #ifdef CONFIG_SYSFS around the code related to
sysfs.

Signed-off-by: JA(C)rA(C)my Lefaure <jeremy.lefaure@lse.epita.fr>
---
Sorry for the typo in v2. Thank you Kirill.
I hope that everything is ok this time.

 mm/khugepaged.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 728d779..87e1a7ca 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -103,6 +103,7 @@ static struct khugepaged_scan khugepaged_scan = {
 	.mm_head = LIST_HEAD_INIT(khugepaged_scan.mm_head),
 };
 
+#ifdef CONFIG_SYSFS
 static ssize_t scan_sleep_millisecs_show(struct kobject *kobj,
 					 struct kobj_attribute *attr,
 					 char *buf)
@@ -295,6 +296,7 @@ struct attribute_group khugepaged_attr_group = {
 	.attrs = khugepaged_attr,
 	.name = "khugepaged",
 };
+#endif /* CONFIG_SYSFS */
 
 #define VM_NO_KHUGEPAGED (VM_SPECIAL | VM_HUGETLB)
 
-- 
2.10.2

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