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

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Date:   Wed, 19 Jul 2023 09:21:43 +0200
From:   Andreas Schwab <schwab@...e.de>
To:     Celeste Liu <coelacanthushex@...il.com>
Cc:     Palmer Dabbelt <palmer@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
        Björn Töpel <bjorn@...osinc.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Felix Yan <felixonmars@...hlinux.org>,
        Ruizhe Pan <c141028@...il.com>,
        Shiqi Zhang <shiqi@...c.iscas.ac.cn>
Subject: Re: [PATCH v3] riscv: entry: set a0 = -ENOSYS only when syscall != -1

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.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
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