[PATCH 2/4] bdi: convert bdi_debug_register to int
From: weiping zhang <hidden>
Date: 2017-10-26 17:36:05
Also in:
linux-mm
Subsystem:
memory management, memory management - misc, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Convert bdi_debug_register to int and then do error handle for it. Signed-off-by: weiping zhang <redacted> --- mm/backing-dev.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 5072be19d9b2..e9d6a1ede12b 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c@@ -116,11 +116,23 @@ static const struct file_operations bdi_debug_stats_fops = { .release = single_release, }; -static void bdi_debug_register(struct backing_dev_info *bdi, const char *name) +static int bdi_debug_register(struct backing_dev_info *bdi, const char *name) { + if (!bdi_debug_root) + return -ENOMEM; + bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root); + if (!bdi->debug_dir) + return -ENOMEM; + bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir, bdi, &bdi_debug_stats_fops); + if (!bdi->debug_stats) { + debugfs_remove(bdi->debug_dir); + return -ENOMEM; + } + + return 0; } static void bdi_debug_unregister(struct backing_dev_info *bdi)
@@ -133,9 +145,10 @@ static inline int bdi_debug_init(void) { return 0; } -static inline void bdi_debug_register(struct backing_dev_info *bdi, +static inline int bdi_debug_register(struct backing_dev_info *bdi, const char *name) { + return 0; } static inline void bdi_debug_unregister(struct backing_dev_info *bdi) {
--
2.14.2