linux-kernel - Re: [PATCH for 4.18] MIPS: adapt to rseq API changes

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Date:   Sun, 24 Jun 2018 10:08:07 -0700
From:   Paul Burton <pburton@...ecomp.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Will Deacon <will.deacon@....com>, peterz@...radead.org,
        paulmck@...ux.vnet.ibm.com, boqun.feng@...il.com,
        linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>
Subject: Re: [PATCH for 4.18] MIPS: adapt to rseq API changes

Hi Mathieu,

On Sun, Jun 24, 2018 at 12:25:13PM -0400, Mathieu Desnoyers wrote:
> The prototype of rseq_handle_notify_resume() and rseq_signal_deliver()
> had to be changed to fix handling of traps occuring on signal delivery.
> The API change was merged at the same time as the rseq MIPS port.
> 
> Adapt the MIPS port to this API change.

Ah, you beat me to send this out :)

Pushed to mips-fixes.

Thanks,
    Paul

> Fixes: 784e0300fe ("rseq: Avoid infinite recursion when delivering SIGSEGV")
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: peterz@...radead.org
> Cc: paulmck@...ux.vnet.ibm.com
> Cc: boqun.feng@...il.com
> Cc: linux-mips@...ux-mips.org
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Paul Burton <paul.burton@...s.com>
> Cc: James Hogan <jhogan@...nel.org>
> ---
>  arch/mips/kernel/signal.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
> index 00f2535d2226..0a9cfe7a0372 100644
> --- a/arch/mips/kernel/signal.c
> +++ b/arch/mips/kernel/signal.c
> @@ -801,7 +801,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
>  		regs->regs[0] = 0;		/* Don't deal with this again.	*/
>  	}
>  
> -	rseq_signal_deliver(regs);
> +	rseq_signal_deliver(ksig, regs);
>  
>  	if (sig_uses_siginfo(&ksig->ka, abi))
>  		ret = abi->setup_rt_frame(vdso + abi->vdso->off_rt_sigreturn,
> @@ -870,7 +870,7 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
>  	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
>  		clear_thread_flag(TIF_NOTIFY_RESUME);
>  		tracehook_notify_resume(regs);
> -		rseq_handle_notify_resume(regs);
> +		rseq_handle_notify_resume(NULL, regs);
>  	}
>  
>  	user_enter();
> -- 
> 2.11.0
>