> SYSCALL_DEFINE3(riscv_flush_icache, uintptr_t, start, uintptr_t, end, > uintptr_t, flags) > { > +#ifdef CONFIG_SMP > struct mm_struct *mm = current->mm; > bool local = (flags & SYS_RISCV_FLUSH_ICACHE_LOCAL) != 0; > +#endif > > /* Check the reserved flags. */ > if (unlikely(flags & ~SYS_RISCV_FLUSH_ICACHE_ALL)) > return -EINVAL; > > + /* > + * Without CONFIG_SMP flush_icache_mm is a just a flush_icache_all(), > + * which generates unused variable warnings all over this function. > + */ > +#ifdef CONFIG_SMP > flush_icache_mm(mm, local); > +#else > + flush_icache_all(); > +#endif
Eeek. Something like an unconditional: flush_icache_mm(current->mm, flags & SYS_RISCV_FLUSH_ICACHE_LOCAL); should solve those issues. Also in the longer run we should turn the !SMP flush_icache_mm stub into an inline function to solve this problem for all potential callers. Excepte that flush_icache_mm happens to be a RISC-V specific API without any other callers. So for now I think the above is what I'd do, but this area has a lot of room for cleanup.