From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Vincent Chen <vincent.chen@sifive.com>,
Guo Ren <guoren@linux.alibaba.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
linux-kselftest <linux-kselftest@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>
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: <1257037909.25426.1626705790861.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <1583733592-22873-3-git-send-email-vincent.chen@sifive.com>
----- On Mar 9, 2020, at 1:59 AM, Vincent Chen vincent.chen@sifive.com 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.
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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next prev parent reply other threads:[~2021-07-19 14:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 5:59 [PATCH V2 0/3] riscv: add support for restartable sequence Vincent Chen
2020-03-09 5:59 ` [PATCH V2 1/3] riscv: add required functions to enable HAVE_REGS_AND_STACK_ACCESS_API Vincent Chen
2020-03-09 5:59 ` [PATCH V2 2/3] riscv: Add support for restartable sequence Vincent Chen
2021-07-19 14:43 ` Mathieu Desnoyers [this message]
2021-07-21 3:19 ` Vincent Chen
2020-03-09 5:59 ` [PATCH V2 3/3] rseq/selftests: Add support for riscv Vincent Chen
2020-03-26 15:49 ` Palmer Dabbelt
2020-03-26 16:17 ` Mathieu Desnoyers
2020-03-27 8:33 ` Vincent Chen
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