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From:   Paul Burton <paul.burton@mips.com>
To:     Arnd Bergmann <arnd@arndb.de>
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Subject: Re: [PATCH 2/2] arch: add pidfd and io_uring syscalls everywhere
Thread-Topic: [PATCH 2/2] arch: add pidfd and io_uring syscalls everywhere
Thread-Index: AQHU4xnDP1dzfUK3kECwl5vlzfGO86YcnIQA
Date:   Mon, 25 Mar 2019 17:37:11 +0000
Message-ID: <20190325173704.mun2cj2ulswv7s3i@pburton-laptop>
References: <20190325143521.34928-1-arnd@arndb.de>
 <20190325144737.703921-1-arnd@arndb.de>
In-Reply-To: <20190325144737.703921-1-arnd@arndb.de>
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Hi Arnd,

On Mon, Mar 25, 2019 at 03:47:37PM +0100, Arnd Bergmann wrote:
> Add the io_uring and pidfd_send_signal system calls to all architectures.
>=20
> These system calls are designed to handle both native and compat tasks,
> so all entries are the same across architectures, only arm-compat and
> the generic tale still use an old format.
>=20
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>%
> diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel=
/syscalls/syscall_n64.tbl
> index c85502e67b44..c4a49f7d57bb 100644
> --- a/arch/mips/kernel/syscalls/syscall_n64.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
> @@ -338,3 +338,7 @@
>  327	n64	rseq				sys_rseq
>  328	n64	io_pgetevents			sys_io_pgetevents
>  # 329 through 423 are reserved to sync up with other architectures
> +424	common	pidfd_send_signal		sys_pidfd_send_signal
> +425	common	io_uring_setup			sys_io_uring_setup
> +426	common	io_uring_enter			sys_io_uring_enter
> +427	common	io_uring_register		sys_io_uring_register

Shouldn't these declare the ABI as "n64"?

I don't see anywhere that it would actually change the generated code,
but a comment at the top of the file says that every entry should use
"n64" and so far they all do. Did you have something else in mind here?

Thanks,
    Paul