On Fri, 14 Jul 2023 07:59:14 +0800 Baoquan He <bhe@xxxxxxxxxx> wrote: > > > All errors (new ones prefixed by >>): > > > > > > In file included from drivers/clk/clk-fixed-mmio.c:13: > > > In file included from include/linux/io.h:13: > > > In file included from arch/s390/include/asm/io.h:78: > > > include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] > > > 547 | val = __raw_readb(PCI_IOBASE + addr); > > > | ~~~~~~~~~~ ^ > > > > Thanks. When I tried that config I got > > These two kinds of errors have been reported many times. > > This PCI_IOBASE warning will be fixed by Niklas's patch at below: > > https://lore.kernel.org/20230522105049.1467313-1-schnelle@xxxxxxxxxxxxx/ > > > Nathan told this when he reviewed by patch at this sub-thread: > https://lore.kernel.org/all/20230612160237.GA199007@dev-arch.thelio-3990X/T/#u > > Quote his words here: > === > I believe that this series [1] by Niklas Schnelle should take care of > the PCI_IOBASE warnings (which are not Hexagon specific), so there is no > need to worry about them when they show up in build reports. > > [1]: https://lore.kernel.org/20230522105049.1467313-1-schnelle@xxxxxxxxxxxxx/ OK, I'll restore the series "mm: ioremap: Convert architectures to take GENERIC_IOREMAP way", v8. This kind of already-was-there warning causes quite some trouble. Attempts to fix such fallout are appreciated.
