linux-kernel - Re: [PATCH 1/1] [vfs/proc] task_nommu: fix compile failing bug because of spilt file.h

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Date:	Mon, 5 May 2008 01:25:37 +0800
From:	"Bryan Wu" <cooloney@...nel.org>
To:	"Al Viro" <viro@...iv.linux.org.uk>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] [vfs/proc] task_nommu: fix compile failing bug because of spilt file.h

On Sun, May 4, 2008 at 11:30 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Sun, May 04, 2008 at 11:12:55PM +0800, Bryan Wu wrote:
>  > diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
>  > index 6cba820..987bc69 100644
>  > --- a/fs/proc/task_nommu.c
>  > +++ b/fs/proc/task_nommu.c
>  > @@ -1,6 +1,7 @@
>  >
>  >  #include <linux/mm.h>
>  >  #include <linux/file.h>
>  > +#include <linux/fdtable.h>
>  >  #include <linux/mount.h>
>  >  #include <linux/ptrace.h>
>  >  #include <linux/seq_file.h>
>
>  Well...  I see what it's trying to do, but it's a bullshit.  Look: it's from
>         if (current->files && atomic_read(&current->files->count) > 1)
>                 sbytes += kobjsize(current->files);
>         else
>                 bytes += kobjsize(current->files);
>  Now, what we really have is size of current->files (fixed and not too large)
>  + if descriptor table is too large to be embedded,
>         size of current->files->fdt
>         size of current->files->fdt->fd
>         size of current->files->fdt->open_fds/->close_on_exec
>  And the second term there can be *large*, so if we are really serious about
>  taking descriptor table footprint into account, we'd better take care of
>  that too.  I'm not sure that we want to, though - note that we do that only
>  on nommu targets...
>
>  So what's that code really trying to achieve?
>

Wow, my patch is just to kill the compile error, I did not notice this
large size issue here.
I'd like to improve this code later.

Thanks
-Bryan
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