linux-kernel - Re: [patch] mm: tiny-shmem fix lor, mmap_sem vs i

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Date:	Wed, 24 Sep 2008 19:18:25 +0100
From:	David Howells <dhowells@...hat.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	dhowells@...hat.com, Hugh Dickins <hugh@...itas.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Matt Mackall <mpm@...enic.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: Re: [patch] mm: tiny-shmem fix lor, mmap_sem vs i_mutex

Nick Piggin <npiggin@...e.de> wrote:

> RFC Quick patch to fix nommu anonymous shared memory without breaking
> locking...

That works:

# /doshm sysv                                                                   
Command: sysv                                                                   
shmid: 0                                                                        
memory: 0xc3b00000                                                              
c3060000-c306a788 r-xs 00000000 00:0b 14582157   /lib/ld-uClibc-0.9.28.so       
c3100000-c315ede4 r-xs 00000000 00:0b 14582179   /lib/libuClibc-0.9.28.so       
c3938000-c393c000 rw-p 00000000 00:00 0                                         
c3a68000-c3a6c000 rw-p 00008000 00:0b 14582157   /lib/ld-uClibc-0.9.28.so       
c3a78000-c3a7c000 rw-p 00000000 00:0b 13763417   /doshm                         
c3a80000-c3aa0000 rwxp 00000000 00:00 0                                         
c3aa0000-c3aac000 rw-p 00000000 00:00 0                                         
c3ab8000-c3abc000 r-xs 00000000 00:0b 13763417   /doshm                         
c3b00000-c3bfa000 rw-S 00000000 00:07 0          /SYSV00000000 (deleted)        
c3b00000-c3bfa000 rw-S 00000000 00:07 0          /SYSV00000000 (deleted)        
nattch 2                                                                        


Acked-by: David Howells <dhowells@...hat.com>
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