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authorLukas Wunner <lukas@wunner.de>2024-04-06 16:52:01 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-04-11 17:02:25 +0300
commitd48c03198a92edf41e89477dab4f602df15165ee (patch)
treec5b246c1c27d1914859f3ff26c5a80979c127083 /crypto/ansi_cprng.c
parent85d2b0aa170351380be39fe4ff7973df1427fe76 (diff)
downloadlinux-d48c03198a92edf41e89477dab4f602df15165ee.tar.xz
sysfs: Add sysfs_bin_attr_simple_read() helper
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@wunner.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/5ed62b197a442ec6db53d8746d9d806dd0576e2d.1712410202.git.lukas@wunner.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto/ansi_cprng.c')
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