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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Linus Walleij , =?utf-8?q?Alvin_=C5=A0ipraga?= , Yury Norov , Rasmus Villemoes , Russell King Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Luiz Angelo Daros de Luca X-Mailer: b4 0.15.1 Some hardware stores logical fields split across multiple registers, requiring partial values to be reassembled using shifts and masks. Add FIELD_WIDTH(), a helper that returns the number of contiguous bits covered by a bitfield mask. This allows callers to determine how much a partial value needs to be shifted when reconstructing a field. This complements FIELD_MAX() and FIELD_FIT(), and avoids reimplementing bit counting logic in drivers. Signed-off-by: Luiz Angelo Daros de Luca --- include/linux/bitfield.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h index 54aeeef1f0ec..8d6c1c309c3b 100644 --- a/include/linux/bitfield.h +++ b/include/linux/bitfield.h @@ -111,6 +111,19 @@ (typeof(_mask))((_mask) >> __bf_shf(_mask)); \ }) =20 +/** + * FIELD_WIDTH() - return the width of a bitfield + * @_mask: shifted mask defining the field's length and position + * + * Returns the number of contiguous bits covered by @_mask. + * This corresponds to the bit width of FIELD_MAX(@_mask). + */ +#define FIELD_WIDTH(_mask) \ + ({ \ + __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_WIDTH: "); \ + __bf_shf(~FIELD_MAX(_mask)); \ + }) + /** * FIELD_FIT() - check if value fits in the field * @_mask: shifted mask defining the field's length and position --=20 2.53.0