RISC-V: Don't use a global include guard for uapi/asm/syscalls.

It turns out that we weren't actually hooking sys_riscv_flush_icache into the syscall table, which results in any flush_icache() call that escapes the vDSO to silently do nothing. Changes since v2: * sys_riscv_flush_icache actually flushes the icache when SMP=n. Thanks to Andrew for pointing o

[PATCH v2 0/2] RISC-V: Don't use a global include guard for uapi/asm/syscalls.

It turns out that we weren't actually hooking sys_riscv_flush_icache into the syscall table, which results in any flush_icache() call that escapes the vDSO to silently do nothing. Changes since v1: * sys_riscv_flush_icache is now defined even when SMP=n, which allows this patch set to build aga