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

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?