On Mon, Jul 22, 2024 at 03:59:00PM +0100, Maciej W. Rozycki wrote: > On Mon, 22 Jul 2024, Lukas Wunner wrote: > > I assume this means that the compiler uses non-trapping instructions > > for addition/subtraction on Mips. Consequently, calling die_if_kernel() > > from do_ov() in arch/mips/kernel/traps.c should no longer be necessary > > as it can never happen. > > > > Can you confirm or deny this? [...] > MIPS C compilers have never produced trapping addition/subtraction > instructions, which have been reserved for use by other programming > languages. And GCC specifically has never produced these instructions for > any of the languages supported, there are no patterns in the MIPS backend > defined that would produce these instructions. The only way to encounter > one of them in the execution stream is by means of handcoded assembly. [...] > Did I answer your question? Yes thank you this helps greatly. Lukas
