Hello Binbin Zhou,
Commit 71e7d3cb6e55 ("dmaengine: ls2x-apb: New driver for the
Loongson LS2X APB DMA controller") from Dec 18, 2023 (linux-next),
leads to the following Smatch static checker warning:
drivers/dma/loongson2-apb-dma.c:189 ls2x_dma_write_cmd()
warn: was expecting a 64 bit value instead of '~(((0)) + (((~((0))) - (((1)) << (0)) + 1) & (~((0)) >> ((8 * 4) - 1 - (4)))))'
drivers/dma/loongson2-apb-dma.c
184 static void ls2x_dma_write_cmd(struct ls2x_dma_chan *lchan, bool cmd)
185 {
186 struct ls2x_dma_priv *priv = to_ldma_priv(lchan->vchan.chan.device);
187 u64 val;
188
--> 189 val = lo_hi_readq(priv->regs + LDMA_ORDER_ERG) & ~LDMA_CONFIG_MASK;
On a 32bit build the ~LDMA_CONFIG_MASK will zero out the high 32 bits. Should
LDMA_CONFIG_MASK be defined with GENMASK_ULL()?
190 val |= LDMA_64BIT_EN | cmd;
191 lo_hi_writeq(val, priv->regs + LDMA_ORDER_ERG);
192 }
regards,
dan carpenter
