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From: Michal Hocko <mhocko@kernel.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Joel Stanley <joel@jms.id.au>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux-Next Mailing List <linux-next@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Abdul Haleem <abdhalee@linux.vnet.ibm.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	"James E.J. Bottomley" <jejb@parisc-linux.org>,
	Helge Deller <deller@gmx.de>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>,
	"David S. Miller" <davem@davemloft.net>,
	Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org
Subject: Re: linux-next: Tree for Nov 7
Date: Mon, 13 Nov 2017 16:49:39 +0100	[thread overview]
Message-ID: <20171113154939.6ui2fmpokpm7g4oj@dhcp22.suse.cz> (raw)
In-Reply-To: <20171113151641.yfqrecpcxllpn5mq@dhcp22.suse.cz>

On Mon 13-11-17 16:16:41, Michal Hocko wrote:
> On Mon 13-11-17 13:00:57, Michal Hocko wrote:
> [...]
> > Yes, I have mentioned that in the previous email but the amount of code
> > would be even larger. Basically every arch which reimplements
> > arch_get_unmapped_area would have to special case new MAP_FIXED flag to
> > do vma lookup.
> 
> It turned out that this might be much more easier than I thought after
> all. It seems we can really handle that in the common code. This would
> mean that we are exposing a new functionality to the userspace though.
> Myabe this would be useful on its own though. Just a quick draft (not
> even compile tested) whether this makes sense in general. I would be
> worried about unexpected behavior when somebody set other bit without a
> good reason and we might fail with ENOMEM for such a call now.

Hmm, the bigger problem would be the backward compatibility actually. We
would get silent corruptions which is exactly what the flag is trying
fix. mmap flags handling really sucks. So I guess we would have to make
the flag internal only :/

-- 
Michal Hocko
SUSE Labs

  parent reply	other threads:[~2017-11-13 15:49 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-07  5:22 linux-next: Tree for Nov 7 Stephen Rothwell
2017-11-07 22:22 ` Joel Stanley
2017-11-08 14:20   ` Michal Hocko
2017-11-10 12:30     ` Michal Hocko
2017-11-12  1:08       ` Joel Stanley
2017-11-13  9:20         ` Michal Hocko
2017-11-13  9:34           ` Russell King - ARM Linux
2017-11-13  9:42           ` Michal Hocko
2017-11-13 11:34             ` Michael Ellerman
2017-11-13 12:00               ` Michal Hocko
2017-11-13 15:16                 ` Michal Hocko
2017-11-13 15:48                   ` Russell King - ARM Linux
2017-11-13 15:59                     ` Michal Hocko
2017-11-13 15:49                   ` Michal Hocko [this message]
2017-11-13 16:06                     ` Michal Hocko
2017-11-13 16:35                       ` Khalid Aziz
2017-11-14  7:07                         ` Michal Hocko
2017-11-14  9:18                       ` Michael Ellerman
2017-11-14  9:29                         ` Michal Hocko
2017-11-14  9:02                   ` Michael Ellerman
2017-11-14  8:54                 ` Michael Ellerman
2017-11-14  9:04                   ` Michal Hocko
2017-11-14 14:52                     ` Khalid Aziz
2017-11-13 14:11           ` Michal Hocko
2017-11-13 15:09             ` Russell King - ARM Linux
2017-11-13 15:31               ` Michal Hocko
2017-11-14  0:03         ` Andrew Morton
2017-11-14  0:36           ` Stephen Rothwell
  -- strict thread matches above, loose matches on Subject: below --
2023-11-07  1:17 Stephen Rothwell
2022-11-07  3:44 Stephen Rothwell
2019-11-07  8:07 Stephen Rothwell
2018-11-07  3:16 Stephen Rothwell
2013-11-07  7:31 Stephen Rothwell
2012-11-07  5:15 Stephen Rothwell

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