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| author | Lukas Wunner <lukas@wunner.de> | 2024-04-20 23:00:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-04 18:37:03 +0300 |
| commit | 3cc50d07be10f67aff836f8247a240ec132c6a67 (patch) | |
| tree | 524f6eab98357bcd09406f611a056f74acbeb846 /arch | |
| parent | e5019b14230a0bc1f6641c9850ae39cfe76ad2aa (diff) | |
| download | linux-3cc50d07be10f67aff836f8247a240ec132c6a67.tar.xz | |
driver core: Add device_show_string() helper for sysfs attributes
For drivers wishing to expose an unsigned long, int or bool at a static
memory location in sysfs, the driver core provides ready-made helpers
such as device_show_ulong() to be used as ->show() callback.
Some drivers need to expose a string and so far they all provide their
own ->show() implementation. arch/powerpc/perf/hv-24x7.c went so far
as to create a device_show_string() helper but kept it private.
Make it public for reuse by other drivers. The pattern seems to be
sufficiently frequent to merit a public helper.
Add a DEVICE_STRING_ATTR_RO() macro in line with the existing
DEVICE_ULONG_ATTR() and similar macros to ease declaration of string
attributes.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2e3eaaf2600bb55c0415c23ba301e809403a7aa2.1713608122.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/perf/hv-24x7.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index 057ec2e3451d..d400fa391c27 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -425,16 +425,6 @@ static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp) return kasprintf(gfp, "%.*s", max_len, maybe_str); } -static ssize_t device_show_string(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct dev_ext_attribute *d; - - d = container_of(attr, struct dev_ext_attribute, attr); - - return sprintf(buf, "%s\n", (char *)d->var); -} - static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr, char *buf) { |