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Date:   Thu, 16 Jun 2022 13:24:26 -0700
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Subject: Re: [RFC PATCH 3/6] testing/pkeys: Add additional test for
 pkey_alloc()
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To:     Sohil Mehta <sohil.mehta@intel.com>, ira.weiny@intel.com,
        linux-api@vger.kernel.org
Cc:     Dave Hansen <dave.hansen@linux.intel.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>, x86@kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-kselftest@vger.kernel.org
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From:   Dave Hansen <dave.hansen@intel.com>
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On 6/16/22 12:25, Sohil Mehta wrote:
> Should we have different return error codes when compile support is 
> disabled vs when runtime support is missing?

It doesn't *really* matter.  Programs have to be able to run on old
kernels which will return ENOSYS.  So, _when_ new kernels return ENOSYS
or ENOSPC is pretty immaterial.