linux-kernel - Re: [RFC PATCH 0/6] User pkey minor bug fixes

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Message-ID: <948bc7f4-f1c0-9b79-0eac-df8659b22753@intel.com>
Date:   Mon, 13 Jun 2022 15:05:30 -0700
From:   Sohil Mehta <sohil.mehta@...el.com>
To:     <ira.weiny@...el.com>, <linux-api@...r.kernel.org>
CC:     <x86@...nel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kselftest@...r.kernel.org>
Subject: Re: [RFC PATCH 0/6] User pkey minor bug fixes

On 6/10/2022 4:35 PM, ira.weiny@...el.com wrote:

> 
> glibc says it returns ENOSYS if the system does not support pkeys but I don't
> see where ENOSYS is returned?  AFAICS it just returns what the kernel returns.
> So it is probably up to user of glibc.
> 

Implementation of the pkeys system calls is arch specific and 
conditional. See kernel/sys_ni.c

glibc is probably talking about ENOSYS being returned when the 
architecture doesn't have support or the CONFIG option is disabled on 
supported architectures.

Thanks,
Sohil