Re: [PATCH net-next v14 3/5] net: dsa: motorcomm: use fixed-width GENMASK_U*() helpers

[netdev-bot+sashiko@kernel.org]

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Low priority / nit picks for your consideration:

- [Low] The commit message for "net: dsa: motorcomm: use fixed-width
  GENMASK_U*() helpers" does not describe the diff correctly.

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net: dsa: motorcomm: use fixed-width GENMASK_U*() helpers

This patch replaces several GENMASK() uses in the motorcomm DSA driver
with GENMASK_U16() and GENMASK_U32(). It touches the internal_mask
entries in yt921x_infos[], the ctrl value in yt921x_chip_setup_dsa()
and the phy_mask computation in yt921x_mbus_int_init(). It is described
as a type cleanup with no functional change.

> Some masks assigned to u16 and u32 fields are defined with
> GENMASK(),which is an unsigned long constant and wider than
> the field type on 64-bit builds. Convert the affected
> internal_mask entries in chip.c and the YT921X_MBUS_CTRL_*
> masks used by mdio_bus.c to fixed-width helpers.

[Severity: Low]
Does this description match the diff?

The YT921X_MBUS_CTRL_* masks are defined in
drivers/net/dsa/motorcomm/mdio_bus.h. This patch does not touch that
file, and the masks still use plain GENMASK() after the patch:

#define  YT921X_MBUS_CTRL_PORT_M		GENMASK(25, 21)
#define  YT921X_MBUS_CTRL_REG_M			GENMASK(20, 16)
#define  YT921X_MBUS_CTRL_TYPE_M		GENMASK(11, 8)  /* wild guess */
#define  YT921X_MBUS_CTRL_OP_M			GENMASK(3, 2)  /* wild guess */

The only change in mdio_bus.c is the mii_bus phy_mask in
yt921x_mbus_int_init(). That mask is computed from a runtime value and
is not one of the YT921X_MBUS_CTRL_* masks:

-	mbus->phy_mask = (u32)~GENMASK(max_ports - 1, 0);
+	mbus->phy_mask = ~GENMASK_U32(max_ports - 1, 0);

In chip.c, the changes also go beyond the internal_mask entries.
yt921x_chip_setup_dsa() converts the local register value written to
YT921X_FILTER_UNK_UCAST and YT921X_FILTER_UNK_MCAST:

-	ctrl = GENMASK(10, 0);
+	ctrl = GENMASK_U32(10, 0);

Could the message be reworded to describe the phy_mask and ctrl
changes? Alternatively, should the mdio_bus.h conversion be added as
the message describes?

The description and the diff disagree, so was the Reviewed-by tag
perhaps given on an earlier revision with different content?

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Sashiko AI review · https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20261013011122.1889766-1-kyle.switch%40motor-comm.com