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

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Message-ID: <20250917182512.GA98086@ax162>
Date: Wed, 17 Sep 2025 11:25:12 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Guodong Xu <guodong@...cstar.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	clang-built-linux <llvm@...ts.linux.dev>,
	open list <linux-kernel@...r.kernel.org>, dmaengine@...r.kernel.org,
	lkft-triage@...ts.linaro.org,
	Linux Regressions <regressions@...ts.linux.dev>,
	Vinod Koul <vkoul@...nel.org>,
	Anders Roxell <anders.roxell@...aro.org>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Benjamin Copeland <benjamin.copeland@...aro.org>
Subject: Re: next-20250903 x86_64 clang-20 allyesconfig mmp_pdma.c:1188:14:
 error: shift count >= width of type [-Werror,-Wshift-count-overflow]

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@...nel.org> 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