On Thu, May 10, 2018 at 11:24:40PM +1000, Nicholas Piggin wrote: > On Thu, 10 May 2018 08:10:03 -0500 > Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, May 10, 2018 at 03:16:55PM +1000, Nicholas Piggin wrote: > > > The 64-bit toolchain uses the wrong ISA variant for compiling 32-bit > > > kernels, eve with -m32. Set -mcpu=powerpc which is the generic 32-bit > > > powerpc machine type and scheduling model. 32-bit platforms and CPUs > > > can override this with -mcpu= options that come later on the command > > > line. > > > > > > This fixes a lot of build failures due to incompatible assembly when > > > compiling 32-bit kernel with 64-bit toolchain. > > > > So what ISA is set for gas without this patch? With what GCC version? > > I'm not sure, how do I find that out? gcc --version gcc -v <rest of command>, look at the command line options passed to as make something.s, look at what .machine is set (if any). > > And, why is that wrong? > > Some 32-bit platforms and CPU types do not provide -mcpu, so I assume > for 32-bit toolchains that must result in the "powerpc" machine. With It results in whatever is the default for that toolchain. Depends on many things. > 64-bit toolchains > > arch/powerpc/mm/hash_low_32.S:353: Error: missing operand > > Which is, > > tlbie r4 > > Is that v2.06? The original ISA did not have the L field, 2.xx does, for any xx even I think. Segher -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
