linux-kernel - Re: [PATCH v5 3/3] userfaultfd: use per-vma locks in userfaultfd operations

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Date: Tue, 13 Feb 2024 15:40:22 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Lokesh Gidra <lokeshgidra@...gle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, selinux@...r.kernel.org,
        kernel-team@...roid.com, aarcange@...hat.com, peterx@...hat.com,
        david@...hat.com, axelrasmussen@...gle.com, bgeffon@...gle.com,
        willy@...radead.org, jannh@...gle.com, kaleshsingh@...gle.com,
        ngeoffray@...gle.com, timmurray@...gle.com, rppt@...nel.org
Subject: Re: [PATCH v5 3/3] userfaultfd: use per-vma locks in userfaultfd
 operations

* Lokesh Gidra <lokeshgidra@...gle.com> [240213 14:55]:
..

> 
> Regarding int vs long for 'err' type, I'm assuming you are ok with my
> explanation and I should keep long?

For such things, I check for consensus in existing code:
mm/mmap.c - int is used when not returning an address or struct
fs/userfaultfd.c - decoded to int before returning

I'd use int to keep consistent with fs/userfaultfd.c

Thanks,
Liam