Re: [PATCH] mm: msync: require either MS_ASYNC or MS_SYNC

[Christoph Hellwig]

On Tue, Apr 01, 2014 at 02:25:45PM -0400, Richard Hansen wrote:
> For the flags parameter, POSIX says "Either MS_ASYNC or MS_SYNC shall
> be specified, but not both." [1]  There was already a test for the
> "both" condition.  Add a test to ensure that the caller specified one
> of the flags; fail with EINVAL if neither are specified.

This breaks various (sloppy) existing userspace for no gain.

NAK.

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