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SubjectRe: [PATCH v3 1/2] epoll: add nsec timeout support with epoll_pwait2
On Fri, Nov 20, 2020 at 11:28 PM Willem de Bruijn
<> wrote:
> On Fri, Nov 20, 2020 at 2:23 PM Arnd Bergmann <> wrote:
> > On Fri, Nov 20, 2020 at 5:01 PM Willem de Bruijn <> wrote:
> I think it'll be better to split the patchsets:
> epoll: convert internal api to timespec64
> epoll: add syscall epoll_pwait2
> epoll: wire up syscall epoll_pwait2
> selftests/filesystems: expand epoll with epoll_pwait2
> and
> select: compute slack based on relative time
> epoll: compute slack based on relative time
> and judge the slack conversion on its own merit.

Yes, makes sense.

> I also would rather not tie this up with the compat deduplication.
> Happy to take a stab at that though. On that note, when combining
> functions like
> int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
> fd_set __user *exp, struct timespec64 *end_time,
> u64 slack)
> and
> static int compat_core_sys_select(int n, compat_ulong_t __user *inp,
> compat_ulong_t __user *outp, compat_ulong_t __user *exp,
> struct timespec64 *end_time, u64 slack)
> by branching on in_compat_syscall() inside get_fd_set/set_fd_set and
> deprecating their compat_.. counterparts, what would the argument
> pointers look like? Or is that not the approach you have in mind?

In this case, the top-level entry points becomes unified, and you get
the prototype from core_sys_select() with the native arguments.

I would imagine this can be done like the way I proposed
for get_bitmap() in sys_migrate_pages:


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