pi 16. 8. 2019 o 9:02 Ondrej Mosnáček <omosna...@gmail.com> napísal(a): > Hi Herbert, > > pi 16. 8. 2019 o 1:52 Herbert Xu <herb...@gondor.apana.org.au> napísal(a): > > On Thu, Aug 15, 2019 at 10:17:37PM +0800, Zhou Wang wrote: > > > > > > > - dev_dbg(&qm->pdev->dev, "QM mailbox request to q%u: %u-%pad\n", > > > > queue, > > > > - cmd, dma_addr); > > > > + dev_dbg(&qm->pdev->dev, "QM mailbox request to q%u: %u-%#lxad\n", > > > > + queue, cmd, (unsigned long)dma_addr); > > > > > > Thanks. However, to be honest I can't get why we fix it like this. > > > Can you give me a clue? > > > > dma_addr_t is not a pointer. It's an integer type and therefore > > you need to print it out as such. > > According to Documentation/core-api/printk-formats.rst, %pad is the > format specifier intended specifically for dma_addr_t [1], so perhaps > the kbuild robot warning was in fact bogus? > > [1] > https://www.kernel.org/doc/html/latest/core-api/printk-formats.html#dma-address-types-dma-addr-t
Oh, wait, in that section it actually says "Passed by reference.", so Zhou is most likely right that the proper fix is to pass a pointer to the variable containing the address (I assume this is to make the generic GCC's format checking pass even if dma_addr_t is not actually a pointer). > > > > > Actually my patch is buggy too, on some architectures it can be > > a long long so we need to cast is such. > > > > Cheers, > > -- > > Email: Herbert Xu <herb...@gondor.apana.org.au> > > Home Page: http://gondor.apana.org.au/~herbert/ > > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
