On Sun 13-08-17 02:25:56, Christoph Hellwig wrote:
On Sat, Aug 12, 2017 at 07:44:14PM -0700, Dan Williams wrote:
> How about MAP_SYNC == (MAP_SHARED|MAP_PRIVATE)? On older kernels that
> should get -EINVAL, and on new kernels it means SYNC+SHARED.
Cute trick, but I'd hate to waster it just for our little flag.
#define __MAP_VALIDATE MAP_SHARED|MAP_PRIVATE
#define MAP_SYNC 0x??? | __MAP_VALIDATE
so that we can reuse that trick for any new flag?
Heh, that's such an ugly hack that it is cute ;)... I'll use this
definition of MAP_SYNC in my patches and send new version of the series
(probably today in the afternoon if the testing goes fine).
Jan Kara <jack(a)suse.com>
SUSE Labs, CR