[kbuild-all] Re: drivers/mtd/maps/physmap-bt1-rom.c:78:18: sparse: sparse: cast removes address space '__iomem' of expression

Hi Sergey, Serge Semin <Sergey.Semin(a)baikalelectronics.ru&gt; wrote on Wed, 11 Nov 2020 22:22:59 +0300: > On Tue, Nov 10, 2020 at 04:35:56PM +0100, Miquel Raynal wrote: >> Hi Serge, >> >> Serge Semin <Sergey.Semin(a)baikalelectronics.ru&gt; wrote on Tue, 10 Nov >> 2020 14:38:27 +0300: >> >>> Hello Miquel, >>> >>> A situation noted by the warning below won't cause any problem because >>> the casting is done to a non-dereferenced variable. It is utilized >>> as a pointer bias later in that function. Shall we just ignore the >>> warning or still fix it somehow? >> > >> Do you think the cast to a !__iomem value is mandatory here? > > It's not mandatory to have the casting with no __iomem, but wouldn't > doing like this: > + shift = (ssize_t __iomem)src & 0x3; > be looking weird? Really, is there a good way to somehow extract the first > two bits of a __iomem pointer without getting the sparse warning? I asked around me, what about trying uintptr_t?