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From: Mathieu Desnoyers <>
To: Vincent Chen <>,
	Guo Ren <>
Cc: Paul Walmsley <>,
	Palmer Dabbelt <>,
	linux-kselftest <>,
	linux-riscv <>,
	linux-kernel <>,
	Alexander Viro <>,
	Linus Torvalds <>
Subject: Re: [PATCH V2 2/3] riscv: Add support for restartable sequence
Date: Mon, 19 Jul 2021 10:43:10 -0400 (EDT)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

----- On Mar 9, 2020, at 1:59 AM, Vincent Chen wrote:
> --- a/arch/riscv/kernel/signal.c
> +++ b/arch/riscv/kernel/signal.c
> @@ -234,6 +234,7 @@ static void handle_signal(struct ksignal *ksig, struct
> pt_regs *regs)
> 	sigset_t *oldset = sigmask_to_save();
> 	int ret;
> +	rseq_signal_deliver(ksig, regs);
> 	/* Are we from a system call? */
> 	if (regs->cause == EXC_SYSCALL) {


As Al Viro pointed out on IRC, the rseq_signal_deliver() should go after syscall
restart handling, similarly to what is done on every other supported architecture.

Note that there is already an upstream commit derived on this non-upstream patch:

commit 9866d141a097 ("csky: Add support for restartable sequence")

which is broken in the same way.

I'm not sure why I was never CC'd on the csky patch. Considering that nobody
bothered to implement the rseq selftests for csky, I don't see how any of
this is tested. I would favor a revert of that commit until the testing glue
is contributed. Unfortunately, the csky commit has been upstream since v5.7.



Mathieu Desnoyers
EfficiOS Inc.

       reply	other threads:[~2021-07-19 14:43 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
     [not found] ` <>
2021-07-19 14:43   ` Mathieu Desnoyers [this message]
2021-07-21  3:19     ` Vincent Chen

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