(adding Julia Lawall and cocci mailing list)
On Wed, 2018-06-20 at 09:48 -0700, Guenter Roeck wrote:
[]
> > +static inline void npcm7xx_fan_start_capture(struct npcm7xx_pwm_fan_data
> > *data,
> > + u8 fan, u8 cmp)
> > +{
> > + u8 fan_id = 0;
> > + u8 reg_mode = 0;
> > + u8 reg_int = 0;
> > + unsigned long flags;
> > +
> > + fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
> > +
> > + /* to check whether any fan tach is enable */
> > + if (data->npcm7xx_fan[fan_id].FanStFlag != FAN_DISABLE) {
> > + /* reset status */
> > + spin_lock_irqsave(&data->npcm7xx_fan_lock[fan], flags);
> > +
> > + data->npcm7xx_fan[fan_id].FanStFlag = FAN_INIT;
> > + reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> > +
> > + if (cmp == NPCM7XX_FAN_CMPA) {
> > + /* enable interrupt */
> > + iowrite8((u8) (reg_int | (NPCM7XX_FAN_TIEN_TAIEN |
> > + NPCM7XX_FAN_TIEN_TEIEN)),
>
> Is the (u8) typecast really necessary ? Seems unlikely.
The cast is not really necessary here as there would
be an implicit cast already.
Some might complain about loss of type safety and
"make W=123" would probably emit something here.
But casts to the same type are not necessary.
A possible coccinelle script to find casts to the
same type is below, but there are some false positives
for things like __force and __user casts
Also, spatch (1.0.4) seems to have a defect for this
when the type is used in operations that change a
smaller type to int or unsigned int.
i.e.: (offset is u16, but offset * 2 is int)
While running the cocci script below:
HANDLING: drivers/net/ethernet/intel/igb/e1000_nvm.c
diff =
diff -u -p a/drivers/net/drivers/net/ethernet/intel/igb/e1000_nvm.c
b/drivers/net/ethernet/intel/igb/e1000_nvm.c
--- a/drivers/net/ethernet/intel/igb/e1000_nvm.c
+++ b/drivers/net/ethernet/intel/igb/e1000_nvm.c
@@ -335,7 +335,7 @@ s32 igb_read_nvm_spi(struct e1000_hw *hw
/* Send the READ command (opcode + addr) */
igb_shift_out_eec_bits(hw, read_opcode, nvm->opcode_bits);
- igb_shift_out_eec_bits(hw, (u16)(offset*2), nvm->address_bits);
+ igb_shift_out_eec_bits(hw, (offset * 2), nvm->address_bits);
/* Read the data. SPI NVMs increment the address with each byte
* read and will roll over if reading beyond the end. This allows
---
Anyway, here's the cocci script:
$ cat same_typecast.cocci
@@
type T;
T foo;
@@
- (T *)&foo
+ &foo
@@
type T;
T foo;
@@
- (T)foo
+ foo
--
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