linux-kernel - RE: [PATCH 1/2] uapi: split openat2(2) definitions from fcntl.h

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Message-ID: <845fc9e8b55e4868bb4d20655e674b50@AcuMS.aculab.com>
Date:   Thu, 19 Dec 2019 14:05:04 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Aleksa Sarai' <cyphar@...har.com>,
        Florian Weimer <fweimer@...hat.com>
CC:     Alexander Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Shuah Khan <shuah@...nel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        "dev@...ncontainers.org" <dev@...ncontainers.org>,
        "containers@...ts.linux-foundation.org" 
        <containers@...ts.linux-foundation.org>,
        "libc-alpha@...rceware.org" <libc-alpha@...rceware.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: RE: [PATCH 1/2] uapi: split openat2(2) definitions from fcntl.h

From: Aleksa Sarai
> Sent: 19 December 2019 13:45
> On 2019-12-19, Florian Weimer <fweimer@...hat.com> wrote:
> > * Aleksa Sarai:
> >
> > > diff --git a/include/uapi/linux/openat2.h b/include/uapi/linux/openat2.h
> > > new file mode 100644
> > > index 000000000000..19ef775e8e5e
> > > --- /dev/null
> > > +++ b/include/uapi/linux/openat2.h
> > > @@ -0,0 +1,41 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > > +#ifndef _UAPI_LINUX_OPENAT2_H
> > > +#define _UAPI_LINUX_OPENAT2_H
> >
> > I think you should include the relevant header for __align_u64
> > etc. here.
> 
> Right -- no idea why I forgot to include them.

I'm guessing that is just 64bit aligned on 32bit archs like x86?

No need to enforce it provided the structure will have no padding
on archs where the 64bit fields are 64bit aligned.
A plain __u64 should be fine.

	David

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