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btrfs: add __pure attribute to functions

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The attribute is more relaxed than const and the functions could
dereference pointers, as long as the observable state is not changed. We
do have such functions, based on -Wsuggest-attribute=pure .

The visible effects of this patch are negligible, there are differences
in the assembly but hard to summarize.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-10-01 19:57:39 +02:00
parent 4143cb8b6f
commit e1f60a6580
9 changed files with 12 additions and 14 deletions
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6
fs/btrfs/async-thread.c
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@ -53,14 +53,12 @@ struct btrfs_workqueue {
struct __btrfs_workqueue *high;
};
struct btrfs_fs_info *
btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
{
return wq->fs_info;
}
struct btrfs_fs_info *
btrfs_work_owner(const struct btrfs_work *work)
struct btrfs_fs_info * __pure btrfs_work_owner(const struct btrfs_work *work)
{
return work->wq->fs_info;
}

4
fs/btrfs/async-thread.h
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@ -41,8 +41,8 @@ void btrfs_queue_work(struct btrfs_workqueue *wq,
void btrfs_destroy_workqueue(struct btrfs_workqueue *wq);
void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max);
void btrfs_set_work_high_priority(struct btrfs_work *work);
struct btrfs_fs_info *btrfs_work_owner(const struct btrfs_work *work);
struct btrfs_fs_info *btrfs_workqueue_owner(const struct __btrfs_workqueue *wq);
struct btrfs_fs_info * __pure btrfs_work_owner(const struct btrfs_work *work);
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct __btrfs_workqueue *wq);
bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq);
#endif

2
fs/btrfs/ctree.c
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@ -1538,7 +1538,7 @@ static int comp_keys(const struct btrfs_disk_key *disk,
/*
* same as comp_keys only with two btrfs_key's
*/
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
{
if (k1->objectid > k2->objectid)
return 1;

4
fs/btrfs/ctree.h
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@ -2508,7 +2508,7 @@ void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
/* ctree.c */
int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
int level, int *slot);
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid,
int type);
@ -2907,7 +2907,7 @@ long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
int btrfs_ioctl_get_supported_features(void __user *arg);
void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
int btrfs_is_empty_uuid(u8 *uuid);
int __pure btrfs_is_empty_uuid(u8 *uuid);
int btrfs_defrag_file(struct inode *inode, struct file *file,
struct btrfs_ioctl_defrag_range_args *range,
u64 newer_than, unsigned long max_pages);

2
fs/btrfs/dev-replace.c
View File

@ -986,7 +986,7 @@ static int btrfs_dev_replace_kthread(void *data)
return 0;
}
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
{
if (!dev_replace->is_valid)
return 0;

2
fs/btrfs/dev-replace.h
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@ -17,6 +17,6 @@ void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info);
int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info);
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace);
int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace);
#endif

2
fs/btrfs/ioctl.c
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@ -541,7 +541,7 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
return 0;
}
int btrfs_is_empty_uuid(u8 *uuid)
int __pure btrfs_is_empty_uuid(u8 *uuid)
{
int i;

2
fs/btrfs/space-info.c
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@ -10,7 +10,7 @@
#include "transaction.h"
#include "block-group.h"
u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
bool may_use_included)
{
ASSERT(s_info);

2
fs/btrfs/space-info.h
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@ -116,7 +116,7 @@ void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
struct btrfs_space_info **space_info);
struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
u64 flags);
u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
bool may_use_included);
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,