[PATCH v3] riscv: entry: set a0 = -ENOSYS only when syscall != -1

[Björn Töpel]

Andreas Schwab <schwab at suse.de> writes:

> On Jul 19 2023, Celeste Liu wrote:
>
>> @@ -308,7 +312,7 @@ asmlinkage __visible __trap_section void do_trap_ecall_u(struct pt_regs *regs)
>>  
>>  		if (syscall < NR_syscalls)
>>  			syscall_handler(regs, syscall);
>> -		else
>> +		else if ((long)syscall != -1L)
>
> You can also use syscall != -1UL or even syscall != -1.

The former is indeed better for the eyes! :-) The latter will get a
-Wsign-compare warning, no?


Björn