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Subject[PATCH -next] mm:fix build error of def ined but not used
Date
If CONFIG_HUGETLB_PAGE is not set and CONFIG_FS_DAX=y.
Use command "make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-" to
build, will fail:

mm/memory-failure.c:568:13: error: ‘collect_procs_fsdax’ defined
but not used [-Werror=unused-function]
static void collect_procs_fsdax(struct page *page,
^~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [mm/memory-failure.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [mm] Error 2
make: *** Waiting for unfinished jobs....

so extending "#ifdef CONFIG_HUGETLB_PAG" to cover
collect_procs_fsdax() would be a simple resolution.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 143ac5cd7289 ("mm: introduce mf_dax_kill_procs() for fsdax case")
Signed-off-by: Guan Jing <guanjing6@huawei.com>
---
mm/memory-failure.c | 56 ++++++++++++++++++++++-----------------------
1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 545f402c4890..952f117e4584 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -561,34 +561,6 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
i_mmap_unlock_read(mapping);
}

-#ifdef CONFIG_FS_DAX
-/*
- * Collect processes when the error hit a fsdax page.
- */
-static void collect_procs_fsdax(struct page *page,
- struct address_space *mapping, pgoff_t pgoff,
- struct list_head *to_kill)
-{
- struct vm_area_struct *vma;
- struct task_struct *tsk;
-
- i_mmap_lock_read(mapping);
- read_lock(&tasklist_lock);
- for_each_process(tsk) {
- struct task_struct *t = task_early_kill(tsk, true);
-
- if (!t)
- continue;
- vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
- if (vma->vm_mm == t->mm)
- add_to_kill(t, page, pgoff, vma, to_kill);
- }
- }
- read_unlock(&tasklist_lock);
- i_mmap_unlock_read(mapping);
-}
-#endif /* CONFIG_FS_DAX */
-
/*
* Collect the processes who have the corrupted page mapped to kill.
*/
@@ -1540,6 +1512,34 @@ static int try_to_split_thp_page(struct page *page, const char *msg)
}

#ifdef CONFIG_HUGETLB_PAGE
+#ifdef CONFIG_FS_DAX
+/*
+ * Collect processes when the error hit a fsdax page.
+ */
+static void collect_procs_fsdax(struct page *page,
+ struct address_space *mapping, pgoff_t pgoff,
+ struct list_head *to_kill)
+{
+ struct vm_area_struct *vma;
+ struct task_struct *tsk;
+
+ i_mmap_lock_read(mapping);
+ read_lock(&tasklist_lock);
+ for_each_process(tsk) {
+ struct task_struct *t = task_early_kill(tsk, true);
+
+ if (!t)
+ continue;
+ vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
+ if (vma->vm_mm == t->mm)
+ add_to_kill(t, page, pgoff, vma, to_kill);
+ }
+ }
+ read_unlock(&tasklist_lock);
+ i_mmap_unlock_read(mapping);
+}
+#endif /* CONFIG_FS_DAX */
+
/*
* Called from hugetlb code with hugetlb_lock held.
*
--
2.17.1
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