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debugfs: Add debugfs_create_xul() for hexadecimal unsigned long 

The existing debugfs_create_ulong() function supports objects of
type "unsigned long", which are 32-bit or 64-bit depending on the
platform, in decimal form.  To format objects in hexadecimal, various
debugfs_create_x*() functions exist, but all of them take fixed-size
types.

Add a debugfs helper for "unsigned long" objects in hexadecimal format.
This avoids the need for users to open-code the same, or introduce
bugs when casting the value pointer to "u32 *" or "u64 *" to call
debugfs_create_x{32,64}().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191025094130.26033-2-geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2019-10-25 11:41:24 +02:00 committed by Greg Kroah-Hartman
parent 726ce47728
commit d3504757f3
2 changed files with 25 additions and 1 deletions
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5
Documentation/filesystems/debugfs.txt
View File

@ -102,11 +102,14 @@ functions meant to help out in such special cases:
As might be expected, this function will create a debugfs file to represent
a variable of type size_t.
Similarly, there is a helper for variables of type unsigned long:
Similarly, there are helpers for variables of type unsigned long, in decimal
and hexadecimal:
struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
struct dentry *parent,
unsigned long *value);
void debugfs_create_xul(const char *name, umode_t mode,
struct dentry *parent, unsigned long *value);
Boolean values can be placed in debugfs with:

21
include/linux/debugfs.h
View File

@ -351,4 +351,25 @@ static inline ssize_t debugfs_write_file_bool(struct file *file,
#endif
/**
* debugfs_create_xul - create a debugfs file that is used to read and write an
* unsigned long value, formatted in hexadecimal
* @name: a pointer to a string containing the name of the file to create.
* @mode: the permission that the file should have
* @parent: a pointer to the parent dentry for this file. This should be a
* directory dentry if set. If this parameter is %NULL, then the
* file will be created in the root of the debugfs filesystem.
* @value: a pointer to the variable that the file should read to and write
* from.
*/
static inline void debugfs_create_xul(const char *name, umode_t mode,
struct dentry *parent,
unsigned long *value)
{
if (sizeof(*value) == sizeof(u32))
debugfs_create_x32(name, mode, parent, (u32 *)value);
else
debugfs_create_x64(name, mode, parent, (u64 *)value);
}
#endif