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.