Re: next-20250903 x86_64 clang-20 allyesconfig mmp_pdma.c:1188:14: error: shift count >= width of type [-Werror,-Wshift-count-overflow]

[Guodong Xu]

On Thu, Sep 18, 2025 at 2:25 AM Nathan Chancellor <nathan@xxxxxxxxxx> wrote:
>
> Hi Guodong,
>
> On Thu, Sep 04, 2025 at 03:38:21PM +0800, Guodong Xu wrote:
> > On Thu, Sep 4, 2025 at 12:59 AM Nathan Chancellor <nathan@xxxxxxxxxx> wrote:
> > >
> > > On Wed, Sep 03, 2025 at 02:04:10PM +0200, Arnd Bergmann wrote:
> > > > On Wed, Sep 3, 2025, at 12:08, Naresh Kamboju wrote:
> > > >
> > > > > Build error:
> > > > > drivers/dma/mmp_pdma.c:1188:14: error: shift count >= width of type
> > > > > [-Werror,-Wshift-count-overflow]
> > > > >  1188 |         .dma_mask = DMA_BIT_MASK(64),   /* force 64-bit DMA
> > > > > addr capability */
> > > > >       |                     ^~~~~~~~~~~~~~~~
> > > > > include/linux/dma-mapping.h:73:54: note: expanded from macro 'DMA_BIT_MASK'
> > > > >    73 | #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
> > > > >       |                                                      ^ ~~~
> ...
> > Thanks, Arnd. I'll send a patch to clean up and simplify the logic.
>
> This error continues to break our -next builds. Have you submitted this
> patch yet? I searched lore.kernel.org and I did not find anything but I
> wanted to make sure I had not missed anything.
>
> Cheers,
> Nathan

Hi, Nathan

Yes, I just sent it out. Here is the link to the submission:
https://lore.kernel.org/all/20250918-mmp-pdma-simplify-dma-addressing-v1-1-5c2be2b85696@xxxxxxxxxxxx/

BR,
Guodong