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debugfs: Implement debugfs_create_str()

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Implement debugfs_create_str() to easily display names and such in
debugfs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210412102001.415407080@infradead.org
This commit is contained in:
Peter Zijlstra
2021-03-25 10:53:55 +01:00
parent 1011dcce99
commit 9af0440ec8
2 changed files with 108 additions and 0 deletions
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17
include/linux/debugfs.h
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@@ -128,6 +128,8 @@ void debugfs_create_atomic_t(const char *name, umode_t mode,
struct dentry *parent, atomic_t *value);
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
struct dentry *parent, bool *value);
void debugfs_create_str(const char *name, umode_t mode,
struct dentry *parent, char **value);
struct dentry *debugfs_create_blob(const char *name, umode_t mode,
struct dentry *parent,
@@ -156,6 +158,9 @@ ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos);
ssize_t debugfs_read_file_str(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos);
#else
#include <linux/err.h>
@@ -297,6 +302,11 @@ static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
return ERR_PTR(-ENODEV);
}
static inline void debugfs_create_str(const char *name, umode_t mode,
struct dentry *parent,
char **value)
{ }
static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
struct dentry *parent,
struct debugfs_blob_wrapper *blob)
@@ -348,6 +358,13 @@ static inline ssize_t debugfs_write_file_bool(struct file *file,
return -ENODEV;
}
static inline ssize_t debugfs_read_file_str(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
return -ENODEV;
}
#endif
/**