diff options
| -rw-r--r-- | drivers/char/mem.c | 3 | ||||
| -rw-r--r-- | fs/char_dev.c | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 48788db4e28..bc46ea8e359 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -784,10 +784,11 @@ static const struct file_operations zero_fops = { /* * capabilities for /dev/zero * - permits private mappings, "copies" are taken of the source of zeros + * - no writeback happens */ static struct backing_dev_info zero_bdi = { .name = "char/mem", - .capabilities = BDI_CAP_MAP_COPY, + .capabilities = BDI_CAP_MAP_COPY | BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static const struct file_operations full_fops = { diff --git a/fs/char_dev.c b/fs/char_dev.c index d6db933df2b..be7613ebb66 100644 --- a/fs/char_dev.c +++ b/fs/char_dev.c @@ -39,7 +39,9 @@ struct backing_dev_info directly_mappable_cdev_bdi = { #endif /* permit direct mmap, for read, write or exec */ BDI_CAP_MAP_DIRECT | - BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP), + BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP | + /* no writeback happens */ + BDI_CAP_NO_ACCT_AND_WRITEBACK), }; static struct kobj_map *cdev_map; |