Re: [next:master 2131/2422] kernel/sys.c:1888 prctl_set_mm_map() warn: maybe return -EFAULT instead of the bytes remaining?

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On Wed, Aug 27, 2014 at 12:56:13PM +0300, Dan Carpenter wrote:
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   d05446ae2128064a4bb8f74c84f6901ffb5c94bc
> commit: 802d335c0f7f1a1867bf59814c55970a71b10413 [2131/2422] prctl: PR_SET_MM -- introduce PR_SET_MM_MAP operation
> 
> kernel/sys.c:1888 prctl_set_mm_map() warn: maybe return -EFAULT instead of the bytes remaining?
> 
> git remote add next git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> git remote update next
> git checkout 802d335c0f7f1a1867bf59814c55970a71b10413
> vim +1888 kernel/sys.c
> 
> 802d335c Cyrill Gorcunov 2014-08-26  1872  
> 802d335c Cyrill Gorcunov 2014-08-26  1873  	mm->start_code	= prctl_map.start_code;
> 802d335c Cyrill Gorcunov 2014-08-26  1874  	mm->end_code	= prctl_map.end_code;
> 802d335c Cyrill Gorcunov 2014-08-26  1875  	mm->start_data	= prctl_map.start_data;
> 802d335c Cyrill Gorcunov 2014-08-26  1876  	mm->end_data	= prctl_map.end_data;
> 802d335c Cyrill Gorcunov 2014-08-26  1877  	mm->start_brk	= prctl_map.start_brk;
> 802d335c Cyrill Gorcunov 2014-08-26  1878  	mm->brk		= prctl_map.brk;
> 802d335c Cyrill Gorcunov 2014-08-26  1879  	mm->start_stack	= prctl_map.start_stack;
> 802d335c Cyrill Gorcunov 2014-08-26  1880  	mm->arg_start	= prctl_map.arg_start;
> 802d335c Cyrill Gorcunov 2014-08-26  1881  	mm->arg_end	= prctl_map.arg_end;
> 802d335c Cyrill Gorcunov 2014-08-26  1882  	mm->env_start	= prctl_map.env_start;
> 802d335c Cyrill Gorcunov 2014-08-26  1883  	mm->env_end	= prctl_map.env_end;
> 802d335c Cyrill Gorcunov 2014-08-26  1884  
> 802d335c Cyrill Gorcunov 2014-08-26  1885  	error = 0;
> 802d335c Cyrill Gorcunov 2014-08-26  1886  out:
> 802d335c Cyrill Gorcunov 2014-08-26  1887  	up_read(&mm->mmap_sem);
> 802d335c Cyrill Gorcunov 2014-08-26 @1888  	return error;

Not really sure I'm follow. @error is error code either 0 (on success) or
any other if some problem happened.

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