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bitfield: add FIELD_PREP_CONST() 

ANBZ: #9815

commit e2192de59e upstream.

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 <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20230118142652.53f20593504b.Iaeea0aee77a6493d70e573b4aa55c91c00e01e4b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Xuchun Shang <xuchun.shang@linux.alibaba.com>
Reviewed-by: Artie Ding <artie.ding@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3765
This commit is contained in:
Johannes Berg 2023-01-18 14:26:53 +01:00 committed by 小龙
parent 7dc21af755
commit cba8b20c39
1 changed files with 26 additions and 0 deletions
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26
include/linux/bitfield.h
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@ -112,6 +112,32 @@
((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