Split out the madvise behavior applying logic from do_madvise() to make
it easier to reuse from the following change.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
mm/madvise.c | 53 +++++++++++++++++++++++++++++-----------------------
1 file changed, 30 insertions(+), 23 deletions(-)
diff --git a/mm/madvise.c b/mm/madvise.c
index 9cc31efe875a..913936a5c353 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1613,6 +1613,35 @@ static bool is_valid_madvise(unsigned long start, size_t len_in, int behavior)
return true;
}
+static int madvise_do_behavior(struct mm_struct *mm,
+ unsigned long start, size_t len_in, size_t len, int behavior)
+{
+ struct blk_plug plug;
+ unsigned long end;
+ int error;
+
+#ifdef CONFIG_MEMORY_FAILURE
+ if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
+ return madvise_inject_error(behavior, start, start + len_in);
+#endif
+ start = untagged_addr_remote(mm, start);
+ end = start + len;
+
+ blk_start_plug(&plug);
+ switch (behavior) {
+ case MADV_POPULATE_READ:
+ case MADV_POPULATE_WRITE:
+ error = madvise_populate(mm, start, end, behavior);
+ break;
+ default:
+ error = madvise_walk_vmas(mm, start, end, behavior,
+ madvise_vma_behavior);
+ break;
+ }
+ blk_finish_plug(&plug);
+ return error;
+}
+
/*
* The madvise(2) system call.
*
@@ -1690,7 +1719,6 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh
unsigned long end;
int error;
size_t len;
- struct blk_plug plug;
if (!is_valid_madvise(start, len_in, behavior))
return -EINVAL;
@@ -1704,28 +1732,7 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh
error = madvise_lock(mm, behavior);
if (error)
return error;
-
-#ifdef CONFIG_MEMORY_FAILURE
- if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
- return madvise_inject_error(behavior, start, start + len_in);
-#endif
-
- start = untagged_addr_remote(mm, start);
- end = start + len;
-
- blk_start_plug(&plug);
- switch (behavior) {
- case MADV_POPULATE_READ:
- case MADV_POPULATE_WRITE:
- error = madvise_populate(mm, start, end, behavior);
- break;
- default:
- error = madvise_walk_vmas(mm, start, end, behavior,
- madvise_vma_behavior);
- break;
- }
- blk_finish_plug(&plug);
-
+ error = madvise_do_behavior(mm, start, len_in, len, behavior);
madvise_unlock(mm, behavior);
return error;
--
2.39.5
