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From: Cyrill Gorcunov <>
To: Rasmus Villemoes <>
Cc: Andrew Morton <>,,
Subject: Re: [PATCH] kcmp: add separate Kconfig symbol for kcmp syscall
Date: Fri, 10 Jul 2020 11:30:25 +0300	[thread overview]
Message-ID: <20200710083025.GD1999@grain> (raw)
In-Reply-To: <>

On Fri, Jul 10, 2020 at 09:56:31AM +0200, Rasmus Villemoes wrote:
> The ability to check open file descriptions for equality (without
> resorting to unreliable fstat() and fcntl(F_GETFL) comparisons) can be
> useful outside of the checkpoint/restore use case - for example,
> systemd uses kcmp() to deduplicate the per-service file descriptor
> store.
> Make it possible to have the kcmp() syscall without the full
> Signed-off-by: Rasmus Villemoes <>
> ---
> I deliberately drop the ifdef in the eventpoll.h header rather than
> replace with KCMP_SYSCALL; it's harmless to declare a function that
> isn't defined anywhere.

Could you please point why setting #fidef KCMP_SYSCALL in eventpoll.h
is not suitable? Still the overall idea is fine for me, thanks!

Reviewed-by: Cyrill Gorcunov <>

  reply	other threads:[~2020-07-10  8:30 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-10  7:56 Rasmus Villemoes
2020-07-10  8:30 ` Cyrill Gorcunov [this message]
2020-07-10  9:05   ` Rasmus Villemoes
2020-07-10  9:37     ` Cyrill Gorcunov
2020-07-10 15:51 ` Randy Dunlap
2020-07-10 15:57 ` Matthew Wilcox
2020-10-13 19:45   ` Rasmus Villemoes

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