Hi Florian, On 2/25/20 1:27 AM, Florian Weimer wrote: > * Vineet Gupta: > >> +/* Override syscalls for asm-generic ABIs with 64-bit time. */ >> +#if __WORDSIZE == 32 && __TIMESIZE == 64 >> + >> +# undef __NR_futex >> +# define __NR_futex __NR_futex_time64 >> + >> +# undef __NR_rt_sigtimedwait >> +# define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64 > > I'm not totally unsympathetic to this in principle, but I think if we > start messing more with the system call numbers in this way, we should > move away from the __NR_ prefixes and use our own constant names. > > Otherwise, the results could be very confusing, especially if there are > exceptions to this exception and we need the original system call number > after all.
OK I understand that redef could get messy. How about simple #undef of the 32-bit syscalls so they are not available in general and rely on generic code to fallback and DRT. Do note that this is mostly a "preventive" fix (for single exception see below) and new arches will hopefully not trip here as they won't have the 32-bit syscalls to begin with. It is applicable to arches with slightly older version of the asm-generic ABI. And for same reasons I can even move those into ARC sysdep.h - what would you recommend. FWIW the only relevant piece here is futex which generic lll code expects __NR_futex and we need to undef/redef to 64-bit variant (either here or in ARCH specific sysdep.h for RV32 and ARC) so having that part atleast in generic code will help future ports avoid the copy/paste. Thx, -Vineet _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
