linux-kernel - Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error bug

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Message-ID: <Pine.LNX.4.64.0703261335130.11483@sbz-30.cs.Helsinki.FI>
Date:	Mon, 26 Mar 2007 13:37:50 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	"Wu, Bryan" <bryan.wu@...log.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error
 bug

On Mon, 26 Mar 2007, Wu, Bryan wrote:
> As struct mm_struct vm_mm is hidden in struct vm_area_struct in NOMMU
> arch, this is a fixing method when compiling failure on blackfin arch.

What compile error is that? I don't see any #ifdef around ->vm_mm for 
struct vm_area_struct in <linux/mm.h>.

On Mon, 26 Mar 2007, Wu, Bryan wrote:
> +	if (!mm)
> +		return -ENOENT;
> +
>  	details.i_mmap_lock = &mapping->i_mmap_lock;

This means you won't be able to revoke memory mapped files with no-MMU. 
I'd rather fix it properly if someone can give me a clue how mmap works on 
non-MMU.

			Pekka
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