On Sat, Apr 06, 2024 at 03:52:01PM +0200, Lukas Wunner wrote: > When drivers expose a bin_attribute in sysfs which is backed by a buffer > in memory, a common pattern is to set the @private and @size members in > struct bin_attribute to the buffer's location and size. > > The ->read() callback then merely consists of a single memcpy() call. > It's not even necessary to perform bounds checks as these are already > handled by sysfs_kf_bin_read(). > > However each driver is so far providing its own ->read() implementation. > The pattern is sufficiently frequent to merit a public helper, so add > sysfs_bin_attr_simple_read() as well as BIN_ATTR_SIMPLE_RO() and > BIN_ATTR_SIMPLE_ADMIN_RO() macros to ease declaration of such > bin_attributes and reduce LoC and .text section size. > > Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx> > --- > fs/sysfs/file.c | 27 +++++++++++++++++++++++++++ > include/linux/sysfs.h | 15 +++++++++++++++ > 2 files changed, 42 insertions(+) Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
