From e2192de59e457aef8d1f055a452131f0b3e5d097 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 18 Jan 2023 14:26:53 +0100 Subject: [PATCH] bitfield: add FIELD_PREP_CONST() Neither FIELD_PREP() nor *_encode_bits() can be used in constant contexts (such as initializers), but we don't want to define shift constants for all masks just for use in initializers, and having checks that the values fit is also useful. Therefore, add FIELD_PREP_CONST() which is a smaller version of FIELD_PREP() that can only take constant arguments and has less friendly (but not less strict) error checks, and expands to a constant value. Signed-off-by: Johannes Berg Link: https://lore.kernel.org/r/20230118142652.53f20593504b.Iaeea0aee77a6493d70e573b4aa55c91c00e01e4b@changeid Signed-off-by: Johannes Berg --- include/linux/bitfield.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) --- a/include/linux/bitfield.h +++ b/include/linux/bitfield.h @@ -115,6 +115,32 @@ ((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask); \ }) +#define __BF_CHECK_POW2(n) BUILD_BUG_ON_ZERO(((n) & ((n) - 1)) != 0) + +/** + * FIELD_PREP_CONST() - prepare a constant bitfield element + * @_mask: shifted mask defining the field's length and position + * @_val: value to put in the field + * + * FIELD_PREP_CONST() masks and shifts up the value. The result should + * be combined with other fields of the bitfield using logical OR. + * + * Unlike FIELD_PREP() this is a constant expression and can therefore + * be used in initializers. Error checking is less comfortable for this + * version, and non-constant masks cannot be used. + */ +#define FIELD_PREP_CONST(_mask, _val) \ + ( \ + /* mask must be non-zero */ \ + BUILD_BUG_ON_ZERO((_mask) == 0) + \ + /* check if value fits */ \ + BUILD_BUG_ON_ZERO(~((_mask) >> __bf_shf(_mask)) & (_val)) + \ + /* check if mask is contiguous */ \ + __BF_CHECK_POW2((_mask) + (1ULL << __bf_shf(_mask))) + \ + /* and create the value */ \ + (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)) \ + ) + /** * FIELD_GET() - extract a bitfield element * @_mask: shifted mask defining the field's length and position