diff options
| author |   Jakub Kicinski <jakub.kicinski@netronome.com> | 2017-02-09 09:17:27 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-02-10 15:52:24 -0500 |
| commit | 1697599ee301a52cded6499a09bd609f7f63fd06 (patch) | |
| tree | b527e775e84e39aba8e6df205765ec441925e303 | |
| parent | Merge branch 'devlink-small-cleanups' (diff) | |
| download | linux-dev-1697599ee301a52cded6499a09bd609f7f63fd06.tar.xz linux-dev-1697599ee301a52cded6499a09bd609f7f63fd06.zip | |
bitfield.h: add FIELD_FIT() helper
Add a helper for checking at runtime that a value will fit inside
a specified field/mask.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_bpf.h | 2 | ||||
| -rw-r--r-- | include/linux/bitfield.h | 13 |
2 files changed, 13 insertions, 2 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h index 76a19f1796af..9513c80f7be5 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h @@ -39,8 +39,6 @@ #include <linux/list.h> #include <linux/types.h> -#define FIELD_FIT(mask, val) (!((((u64)val) << __bf_shf(mask)) & ~(mask))) - /* For branch fixup logic use up-most byte of branch instruction as scratch * area. Remember to clear this before sending instructions to HW! */ diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h index f6505d83069d..8b9d6fff002d 100644 --- a/include/linux/bitfield.h +++ b/include/linux/bitfield.h @@ -63,6 +63,19 @@ }) /** + * FIELD_FIT() - check if value fits in the field + * @_mask: shifted mask defining the field's length and position + * @_val: value to test against the field + * + * Return: true if @_val can fit inside @_mask, false if @_val is too big. + */ +#define FIELD_FIT(_mask, _val) \ + ({ \ + __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_FIT: "); \ + !((((typeof(_mask))_val) << __bf_shf(_mask)) & ~(_mask)); \ + }) + +/** * FIELD_PREP() - prepare a bitfield element * @_mask: shifted mask defining the field's length and position * @_val: value to put in the field |