lkml.org 
[lkml]   [2007]   [Sep]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH -mm] splice: Disable vmsplice on nommu.
On Tue, Sep 11 2007, Paul Mundt wrote:
> The vmsplice rework in -mm breaks nommu:
>
> fs/built-in.o: In function `splice_setup_vma':
> fs/splice.c:1272: undefined reference to `may_expand_vm'
> fs/splice.c:1272: undefined reference to `protection_map'
> fs/splice.c:1272: undefined reference to `insert_vm_struct'
> fs/splice.c:1272: undefined reference to `vm_stat_account'
>
> This is going to be non-trivial to wire up properly on nommu, and
> it's debateable whether there's even any point in trying. For now,
> disable vmsplice if CONFIG_MMU=n and wire it up as a cond syscall
> for the platforms that support both.

It's a bit of a sledge hammer... Since get_user_pages() appears to work
on nummu, we can just disable the vmsplice-to-userspace bits and leave
the (working) vmsplice-from-userspace in place.

I'm reworking this code anyway in the block branches, so I'll update and
take CONFIG_MMU into consideration.

--
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-11 11:29    [W:0.042 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site