Re: [net-next PATCH 04/10] bitfield.h: add FIELD_WIDTH()

[Luiz Angelo Daros de Luca]

Thanks David and Yuri,

This patch was originally intended to reconstruct a value split across
multiple registers. Originally:

        vlan4k->member =
               FIELD_GET(RTL8365MB_CVLAN_ENTRY_D0_MBR_MASK, data[0]) |
               (FIELD_GET(RTL8365MB_CVLAN_ENTRY_D2_MBR_EXT_MASK, data[2])
                << FIELD_WIDTH(RTL8365MB_CVLAN_ENTRY_D0_MBR_MASK));

However, as Yuri pointed out, I can use FIELD_PREP() to align the bits
into the final struct member without manual bitops. While less common,
this pattern is used elsewhere (e.g., drivers/clk/clk-lmk04832.c). The
updated approach would be:

        vlan4k->member =
               FIELD_PREP(RTL8365MB_CVLAN_MBR_LO_MASK,
                          FIELD_GET(RTL8365MB_CVLAN_ENTRY_D0_MBR_MASK,
data[0])) |
               FIELD_PREP(RTL8365MB_CVLAN_MBR_HI_MASK,

FIELD_GET(RTL8365MB_CVLAN_ENTRY_D2_MBR_EXT_MASK, data[2]));

If this use of FIELD_PREP is preferred, I will drop this FIELD_WIDTH
patch from the series as it would no longer have any users.

Regards,

Luiz