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From: Arnd Bergmann <arnd@arndb.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Borislav Petkov <bp@alien8.de>,
	"David S. Miller" <davem@davemloft.net>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	y2038 Mailman List <y2038@lists.linaro.org>,
	Hannes Reinecke <hare@suse.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-block <linux-block@vger.kernel.org>,
	IDE-ML <linux-ide@vger.kernel.org>
Subject: Re: [PATCH 20/24] compat_ioctl: move HDIO ioctl handling into drivers/ide
Date: Thu, 12 Dec 2019 18:21:58 +0100	[thread overview]
Message-ID: <CAK8P3a26-6ttEdcnJQX2PtCcY_PPDV1UFK8CTogd7uDOm3iu9w@mail.gmail.com> (raw)
In-Reply-To: <20191212162947.GC27991@infradead.org>

On Thu, Dec 12, 2019 at 5:29 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> > +static int put_user_long(long val, unsigned long arg)
> > +{
> > +#ifdef CONFIG_COMPAT
> > +     if (in_compat_syscall())
> > +             return put_user(val, (compat_long_t __user *)compat_ptr(arg));
> > +#endif
> > +     return put_user(val, (long __user *)arg);
> > +}
>
> We had this
>
> #ifdef CONFIG_COMPAT
>         if (in_compat_syscall())
>                 ...
>         ...
> #endif
>
> patter quite frequently.  Can we define a in_compat_syscall stub
> and make sure compat_ptr and the compat_* types are available available
> to clean this up a bit?

in_compat_syscall() already has a reasonable stub, what was missing
when I created this series is the compat_long_t definition and
the compat_ptr() helper.

With patch 01/24, we can rely on the types, but I still need to add
a generic compat_ptr() implementation for non-s390 to remove the
#ifdef here.

That is probably a good idea anyway, it just needs a bit of testing.
The last time I tried this, I ran into problems with the order of compat
header inclusions on some architectures.

I've made a prototype now, will see how it goes.

> > -     if (NULL == (void *) arg) {
> > +     if (NULL == argp) {
>
>         if (!argp) {
>
> ?

changed now.

      Arnd

  reply	other threads:[~2019-12-12 17:22 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11 20:42 [PATCH 00/24] block, scsi: final compat_ioctl cleanup Arnd Bergmann
2019-12-11 20:42 ` [Xen-devel] " Arnd Bergmann
2019-12-11 20:42 ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 01/24] compat: ARM64: always include asm-generic/compat.h Arnd Bergmann
2019-12-11 20:42   ` Arnd Bergmann
2019-12-12 10:16   ` Will Deacon
2019-12-12 10:16     ` Will Deacon
2019-12-12 10:41     ` Arnd Bergmann
2019-12-12 10:41       ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 02/24] compat: scsi: sg: fix v3 compat read/write interface Arnd Bergmann
2019-12-12 16:25   ` Christoph Hellwig
2019-12-12 17:34     ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 03/24] compat_ioctl: block: handle BLKREPORTZONE/BLKRESETZONE Arnd Bergmann
2019-12-12  1:20   ` Damien Le Moal
2019-12-11 20:42 ` [PATCH 04/24] compat_ioctl: block: handle BLKGETZONESZ/BLKGETNRZONES Arnd Bergmann
2019-12-12  1:20   ` Damien Le Moal
2019-12-11 20:42 ` [PATCH 05/24] compat_ioctl: block: handle add zone open, close and finish ioctl Arnd Bergmann
2019-12-12  1:20   ` Damien Le Moal
2019-12-11 20:42 ` [PATCH 06/24] compat_ioctl: block: handle Persistent Reservations Arnd Bergmann
2019-12-11 20:42 ` [PATCH 07/24] compaT_ioctl: ubd, aoe: use blkdev_compat_ptr_ioctl Arnd Bergmann
2019-12-11 20:42   ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 08/24] compat_ioctl: move CDROM_SEND_PACKET handling into scsi Arnd Bergmann
2019-12-11 20:42 ` [PATCH 09/24] compat_ioctl: move CDROMREADADIO to cdrom.c Arnd Bergmann
2019-12-11 20:42 ` [PATCH 10/24] compat_ioctl: cdrom: handle CDROM_LAST_WRITTEN Arnd Bergmann
2019-12-17 15:20   ` [Y2038] " Ben Hutchings
2019-12-17 21:38     ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 11/24] compat_ioctl: block: handle cdrom compat ioctl in non-cdrom drivers Arnd Bergmann
2019-12-11 20:42   ` [Xen-devel] " Arnd Bergmann
2019-12-11 20:42 ` [PATCH 12/24] compat_ioctl: add scsi_compat_ioctl Arnd Bergmann
2019-12-11 20:42 ` [PATCH 13/24] compat_ioctl: bsg: add handler Arnd Bergmann
2019-12-11 20:42 ` [PATCH 14/24] compat_ioctl: ide: floppy: " Arnd Bergmann
2019-12-11 20:42 ` [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers Arnd Bergmann
2019-12-11 23:05   ` Michael S. Tsirkin
2019-12-12  0:28     ` Paolo Bonzini
2019-12-12  0:28     ` Paolo Bonzini
2019-12-12  9:17       ` Arnd Bergmann
2019-12-12  9:17       ` Arnd Bergmann
2019-12-12 10:27       ` Michael S. Tsirkin
2019-12-12 10:27       ` Michael S. Tsirkin
2019-12-12 16:27       ` Christoph Hellwig
2019-12-12 16:35         ` Jens Axboe
2019-12-12 16:35         ` Jens Axboe
2019-12-12 16:27       ` Christoph Hellwig
2019-12-11 23:05   ` Michael S. Tsirkin
2019-12-12 10:25   ` Michael S. Tsirkin
2019-12-12 10:25     ` Michael S. Tsirkin
2019-12-11 20:42 ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 16/24] compat_ioctl: move sys_compat_ioctl() to ioctl.c Arnd Bergmann
2019-12-11 20:42 ` [PATCH 17/24] compat_ioctl: simplify the implementation Arnd Bergmann
2019-12-11 20:42 ` [PATCH 18/24] compat_ioctl: move cdrom commands into cdrom.c Arnd Bergmann
2019-12-11 20:42 ` [PATCH 19/24] compat_ioctl: scsi: handle HDIO commands from drivers Arnd Bergmann
2019-12-11 20:42 ` [PATCH 20/24] compat_ioctl: move HDIO ioctl handling into drivers/ide Arnd Bergmann
2019-12-12 16:29   ` Christoph Hellwig
2019-12-12 17:21     ` Arnd Bergmann [this message]
2019-12-11 20:42 ` [PATCH 21/24] compat_ioctl: block: move blkdev_compat_ioctl() into ioctl.c Arnd Bergmann
2019-12-12 16:30   ` Christoph Hellwig
2019-12-12 17:24     ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 22/24] compat_ioctl: block: simplify compat_blkpg_ioctl() Arnd Bergmann
2019-12-11 20:42 ` [PATCH 23/24] compat_ioctl: simplify up block/ioctl.c Arnd Bergmann
2019-12-11 20:42 ` [PATCH 24/24] Documentation: document ioctl interfaces better Arnd Bergmann
2019-12-11 21:05   ` Jonathan Corbet
2019-12-12 10:56     ` Arnd Bergmann
2019-12-12  8:16   ` Geert Uytterhoeven
2019-12-12 11:04     ` Arnd Bergmann

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