linux-kernel - Re: [PATCH 2/3] LoongArch: Add RSEQ

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Date:   Fri, 27 Oct 2023 09:40:09 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Huang Pei <huangpei@...ngson.cn>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] LoongArch: Add RSEQ_SIG break code definition

Hi, Mathieu,

On Fri, Oct 27, 2023 at 2:16 AM Mathieu Desnoyers
<mathieu.desnoyers@...icios.com> wrote:
>
> On 2023-10-26 07:44, Huang Pei wrote:
> > Signed-off-by: Huang Pei <huangpei@...ngson.cn>
> > ---
> >   arch/loongarch/include/uapi/asm/break.h | 2 ++
>
> Why is this part of the uapi ? None of the other architecture has this
> as part of uapi. It's only defined in the rseq selftest arch-specific
> header file.
>From my point of view, it makes sense to list the dedicated break code
in UAPI. It is harmless and can avoid potential conflict in future.

Huacai

>
> Thanks,
>
> Mathieu
>
> >   1 file changed, 2 insertions(+)
> >
> > diff --git a/arch/loongarch/include/uapi/asm/break.h b/arch/loongarch/include/uapi/asm/break.h
> > index bb9b82ba59f2..e0fcfc304834 100644
> > --- a/arch/loongarch/include/uapi/asm/break.h
> > +++ b/arch/loongarch/include/uapi/asm/break.h
> > @@ -20,4 +20,6 @@
> >   #define BRK_UPROBE_BP               12      /* See <asm/uprobes.h> */
> >   #define BRK_UPROBE_XOLBP    13      /* See <asm/uprobes.h> */
> >
> > +#define BRK_RSEQ_SIG         16      /* See rseq */
> > +
> >   #endif /* __UAPI_ASM_BREAK_H */
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> https://www.efficios.com
>
>