linux-kernel - Re: [PATCH 9/9] exec_path 9/9: remove VM

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Message-ID: <20090604072400.GT9285@us.ibm.com>
Date:	Thu, 4 Jun 2009 00:24:00 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Helsley <matthltc@...ibm.com>, xemul@...allels.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, dave@...ux.vnet.ibm.com,
	mingo@...e.hu, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 9/9] exec_path 9/9: remove VM_EXECUTABLE

On Thu, Jun 04, 2009 at 03:08:10AM +0400, Alexey Dobriyan wrote:
> Noone uses VM_EXECUTABLE now, binfmt loaders set ->exec_path by hand
> and MAP_EXECUTABLE is ignored from userland.

nit: MAP_EXECUTABLE is still used in the binfmt loaders when they
supply flags to do_mmap(). That needs to be removed before getting
rid of VM_EXECUTABLE.

Cheers,
	-Matt Helsley

> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> ---
>  include/linux/mm.h   |    1 -
>  include/linux/mman.h |    1 -
>  2 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index b3b61a6..79854af 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -82,7 +82,6 @@ extern unsigned int kobjsize(const void *objp);
>  #define VM_PFNMAP	0x00000400	/* Page-ranges managed without "struct page", just pure PFN */
>  #define VM_DENYWRITE	0x00000800	/* ETXTBSY on write attempts.. */
> 
> -#define VM_EXECUTABLE	0x00001000
>  #define VM_LOCKED	0x00002000
>  #define VM_IO           0x00004000	/* Memory mapped I/O or similar */
> 
> diff --git a/include/linux/mman.h b/include/linux/mman.h
> index 9872d6c..1a01871 100644
> --- a/include/linux/mman.h
> +++ b/include/linux/mman.h
> @@ -86,7 +86,6 @@ calc_vm_flag_bits(unsigned long flags)
>  {
>  	return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |
>  	       _calc_vm_trans(flags, MAP_DENYWRITE,  VM_DENYWRITE ) |
> -	       _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) |
>  	       _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    );
>  }
>  #endif /* __KERNEL__ */
--
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