From: Al Viro <viro@ZenIV.linux.org.uk>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: akpm@linux-foundation.org, khlebnikov@openvz.org,
minchan@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
hughd@google.com, benh@kernel.crashing.org,
linux@arm.linux.org.uk
Subject: Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit
Date: Fri, 30 Mar 2012 03:19:45 +0100 [thread overview]
Message-ID: <20120330021945.GT6589@ZenIV.linux.org.uk> (raw)
In-Reply-To: <4F6CA298.4000301@jp.fujitsu.com>
On Fri, Mar 23, 2012 at 12:19:36PM -0400, KOSAKI Motohiro wrote:
> On 3/22/2012 5:28 PM, Al Viro wrote:
> > On Thu, Mar 22, 2012 at 02:26:47PM -0700, Andrew Morton wrote:
> >> It would be nice to find some way of triggering compiler warnings or
> >> sparse warnings if someone mixes a 32-bit type with a vm_flags_t. Any
> >> thoughts on this?
> >>
> >> (Maybe that's what __nocast does, but Documentation/sparse.txt doesn't
> >> describe it)
> >
> > Use __bitwise for that - check how gfp_t is handled.
>
> Hmm..
>
> If now we activate __bitwise, really plenty driver start create lots warnings.
> Does it make sense?
Huh? Why would they? Just adjust definitions of VM_... to include
force-cast to vm_flags_t and we should be OK...
> In fact, x86-32 keep 32bit vma_t forever. thus all x86 specific driver don't
> need any change. Moreover many ancient drivers has no maintainer and I can't
> expect such driver will be fixed even though a warning occur.
What warning? If something does manual vma->vm_flags = 0xwhatever, then yes,
we do want it dealt with. If it's vma->vm_flags |= VM_something, there should
be no warnings at all...
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Al Viro <viro@ZenIV.linux.org.uk>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: akpm@linux-foundation.org, khlebnikov@openvz.org,
minchan@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
hughd@google.com, benh@kernel.crashing.org,
linux@arm.linux.org.uk
Subject: Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit
Date: Fri, 30 Mar 2012 03:19:45 +0100 [thread overview]
Message-ID: <20120330021945.GT6589@ZenIV.linux.org.uk> (raw)
In-Reply-To: <4F6CA298.4000301@jp.fujitsu.com>
On Fri, Mar 23, 2012 at 12:19:36PM -0400, KOSAKI Motohiro wrote:
> On 3/22/2012 5:28 PM, Al Viro wrote:
> > On Thu, Mar 22, 2012 at 02:26:47PM -0700, Andrew Morton wrote:
> >> It would be nice to find some way of triggering compiler warnings or
> >> sparse warnings if someone mixes a 32-bit type with a vm_flags_t. Any
> >> thoughts on this?
> >>
> >> (Maybe that's what __nocast does, but Documentation/sparse.txt doesn't
> >> describe it)
> >
> > Use __bitwise for that - check how gfp_t is handled.
>
> Hmm..
>
> If now we activate __bitwise, really plenty driver start create lots warnings.
> Does it make sense?
Huh? Why would they? Just adjust definitions of VM_... to include
force-cast to vm_flags_t and we should be OK...
> In fact, x86-32 keep 32bit vma_t forever. thus all x86 specific driver don't
> need any change. Moreover many ancient drivers has no maintainer and I can't
> expect such driver will be fixed even though a warning occur.
What warning? If something does manual vma->vm_flags = 0xwhatever, then yes,
we do want it dealt with. If it's vma->vm_flags |= VM_something, there should
be no warnings at all...
next prev parent reply other threads:[~2012-03-30 2:19 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-21 6:56 [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 01/16] mm: introduce NR_VMA_FLAGS Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 02/16] mm: use vm_flags_t for vma flags Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 03/16] mm/shmem: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 04/16] mm/nommu: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 7:08 ` Greg Ungerer
2012-03-21 7:08 ` Greg Ungerer
2012-03-21 7:20 ` Konstantin Khlebnikov
2012-03-21 7:20 ` Konstantin Khlebnikov
2012-03-21 12:01 ` [PATCH v2 " Konstantin Khlebnikov
2012-03-21 12:01 ` Konstantin Khlebnikov
2012-03-23 6:47 ` Greg Ungerer
2012-03-23 6:47 ` Greg Ungerer
2012-03-21 6:56 ` [PATCH 05/16] mm/drivers: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 10:34 ` Laurent Pinchart
2012-03-21 10:34 ` Laurent Pinchart
2012-03-21 14:46 ` Greg Kroah-Hartman
2012-03-21 14:46 ` Greg Kroah-Hartman
2012-03-21 6:56 ` [PATCH 06/16] mm/x86: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:57 ` H. Peter Anvin
2012-03-21 6:57 ` H. Peter Anvin
2012-03-21 6:56 ` [PATCH 07/16] mm/arm: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-22 21:21 ` Andrew Morton
2012-03-22 21:21 ` Andrew Morton
2012-03-22 21:21 ` Andrew Morton
2012-03-21 6:56 ` [PATCH 08/16] mm/unicore32: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-27 3:38 ` Guan Xuetao
2012-03-27 3:38 ` Guan Xuetao
2012-03-27 5:58 ` Konstantin Khlebnikov
2012-03-27 5:58 ` Konstantin Khlebnikov
2012-03-27 7:50 ` Guan Xuetao
2012-03-27 7:50 ` Guan Xuetao
2012-03-21 6:56 ` [PATCH 09/16] mm/ia64: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 10/16] mm/powerpc: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 11/16] mm/s390: " Konstantin Khlebnikov
2012-03-21 6:56 ` Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 12/16] mm/mips: " Konstantin Khlebnikov
2012-03-21 6:57 ` Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 13/16] mm/parisc: " Konstantin Khlebnikov
2012-03-21 6:57 ` Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 14/16] mm/score: " Konstantin Khlebnikov
2012-03-21 6:57 ` Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 15/16] mm: cast vm_flags_t to u64 before printing Konstantin Khlebnikov
2012-03-21 6:57 ` Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 16/16] mm: vm_flags_t strict type checking Konstantin Khlebnikov
2012-03-21 6:57 ` Konstantin Khlebnikov
2012-03-21 12:11 ` [PATCH v2 " Konstantin Khlebnikov
2012-03-21 12:11 ` Konstantin Khlebnikov
2012-03-21 10:06 ` [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit Minchan Kim
2012-03-21 10:06 ` Minchan Kim
2012-03-21 13:16 ` Konstantin Khlebnikov
2012-03-21 13:16 ` Konstantin Khlebnikov
2012-03-22 5:39 ` Minchan Kim
2012-03-22 5:39 ` Minchan Kim
2012-03-22 6:22 ` Benjamin Herrenschmidt
2012-03-22 6:22 ` Benjamin Herrenschmidt
2012-03-24 14:46 ` Konstantin Khlebnikov
2012-03-24 14:46 ` Konstantin Khlebnikov
2012-03-24 15:00 ` Konstantin Khlebnikov
2012-03-24 15:00 ` Konstantin Khlebnikov
2012-03-24 23:50 ` Benjamin Herrenschmidt
2012-03-24 23:50 ` Benjamin Herrenschmidt
2012-03-25 7:55 ` Konstantin Khlebnikov
2012-03-25 7:55 ` Konstantin Khlebnikov
2012-03-22 21:26 ` Andrew Morton
2012-03-22 21:26 ` Andrew Morton
2012-03-22 21:28 ` Al Viro
2012-03-22 21:28 ` Al Viro
2012-03-22 21:41 ` Andrew Morton
2012-03-22 21:41 ` Andrew Morton
2012-03-22 21:57 ` Al Viro
2012-03-22 21:57 ` Al Viro
2012-03-22 22:05 ` Konstantin Khlebnikov
2012-03-22 22:05 ` Konstantin Khlebnikov
2012-03-22 22:24 ` Konstantin Khlebnikov
2012-03-22 22:24 ` Konstantin Khlebnikov
2012-03-22 22:39 ` Linus Torvalds
2012-03-22 22:39 ` Linus Torvalds
2012-03-22 22:52 ` Konstantin Khlebnikov
2012-03-22 22:52 ` Konstantin Khlebnikov
2012-03-22 23:09 ` Andrew Morton
2012-03-22 23:09 ` Andrew Morton
2012-03-23 1:42 ` Al Viro
2012-03-23 1:42 ` Al Viro
2012-03-22 22:08 ` Linus Torvalds
2012-03-22 22:08 ` Linus Torvalds
2012-03-23 16:19 ` KOSAKI Motohiro
2012-03-23 16:19 ` KOSAKI Motohiro
2012-03-30 2:19 ` Al Viro [this message]
2012-03-30 2:19 ` Al Viro
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120330021945.GT6589@ZenIV.linux.org.uk \
--to=viro@zeniv.linux.org.uk \
--cc=akpm@linux-foundation.org \
--cc=benh@kernel.crashing.org \
--cc=hughd@google.com \
--cc=khlebnikov@openvz.org \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux@arm.linux.org.uk \
--cc=minchan@kernel.org \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.