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SubjectRe: [PATCH v5 13/14] epoll: implement epoll_create2() syscall
On Mon, Jun 24, 2019 at 4:42 PM Roman Penyaev <rpenyaev@suse.de> wrote:
>
> epoll_create2() is needed to accept EPOLL_USERPOLL flags
> and size, i.e. this patch wires up polling from userspace.

Can you explain in the patch description more what it's needed for?

The man page only states that "Since Linux 2.6.8, the size argument
is ignored", so your description above does not explain why you need
to add the size argument back.

> diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
> index 1db9bbcfb84e..a1d7b695063d 100644
> --- a/arch/alpha/kernel/syscalls/syscall.tbl
> +++ b/arch/alpha/kernel/syscalls/syscall.tbl
> @@ -474,3 +474,5 @@
> 542 common fsmount sys_fsmount
> 543 common fspick sys_fspick
> 544 common pidfd_open sys_pidfd_open
> +# 546 common clone3 sys_clone3
> +547 common epoll_create2 sys_epoll_create2
> diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
> index ff45d8807cb8..1497f3c87d54 100644
> --- a/arch/arm/tools/syscall.tbl
> +++ b/arch/arm/tools/syscall.tbl
> @@ -449,3 +449,4 @@
> 433 common fspick sys_fspick
> 434 common pidfd_open sys_pidfd_open
> 436 common clone3 sys_clone3
> +437 common epoll_create2 sys_epoll_create2

The table changes all look correct and complete, provided we
don't get another patch picking the same number.

Arnd

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