From: David Howells <dhowells@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: torvalds@osdl.org, davidm@snapgear.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] BDI: Provide backing device capability information
Date: Thu, 03 Mar 2005 13:38:15 +0000 [thread overview]
Message-ID: <13767.1109857095@redhat.com> (raw)
In-Reply-To: <20050302135146.2248c7e5.akpm@osdl.org>
Andrew Morton <akpm@osdl.org> wrote:
>
> > +#define BDI_CAP_MAP_COPY 0x00000001 /* Copy can be mapped (MAP_PRIVATE) */
> > +#define BDI_CAP_MAP_DIRECT 0x00000002 /* Can be mapped directly (MAP_SHARED) */
>
> Why not make these bitfields as well?
Because I want to copy the capabilities mask (including these variables) into
a variable in the nommu mmap implementation and eliminate various bits from
that variable under certain conditions.
Making these into bitfields would result in having to use three variables
instead of just the one.
David
next prev parent reply other threads:[~2005-03-03 13:38 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-02 15:50 Improving mmap() support for !MMU further David Howells
2005-03-02 17:07 ` Andrew Morton
2005-03-02 21:34 ` [PATCH 1/2] BDI: Provide backing device capability information David Howells
2005-03-02 21:51 ` Andrew Morton
2005-03-02 22:28 ` Linus Torvalds
2005-03-02 22:39 ` Andrew Morton
2005-03-03 13:42 ` David Howells
2005-03-03 20:33 ` Andrew Morton
2005-03-03 13:38 ` David Howells [this message]
2005-03-03 20:34 ` Andrew Morton
2005-03-07 11:23 ` David Howells
2005-03-07 11:37 ` Andrew Morton
2005-03-07 11:43 ` David Howells
2005-03-07 11:47 ` Andrew Morton
2005-03-07 11:51 ` David Howells
2005-03-07 12:10 ` Andrew Morton
2005-03-07 12:25 ` David Howells
2005-03-07 14:05 ` David Howells
2005-03-07 15:21 ` Miklos Szeredi
2005-03-07 15:41 ` David Howells
2005-03-07 15:45 ` Miklos Szeredi
2005-03-07 16:06 ` David Howells
2005-03-07 16:15 ` Miklos Szeredi
2005-03-07 20:14 ` Andrew Morton
2005-03-08 14:12 ` [PATCH 1/2] BDI: Provide backing device capability information [try #3] David Howells
2005-03-09 0:37 ` Andrew Morton
2005-03-09 10:27 ` David Howells
2005-03-02 21:41 ` [PATCH 2/2] BDI: Improve nommu mmap support David Howells
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