On Tue, May 3, 2016 at 12:50 AM, tip-bot for Stas Sergeev <tip...@zytor.com> wrote: > Commit-ID: 407bc16ad1769f5cb8ad9555611cb198187ef4cd > Gitweb: http://git.kernel.org/tip/407bc16ad1769f5cb8ad9555611cb198187ef4cd > Author: Stas Sergeev <s...@list.ru> > AuthorDate: Thu, 14 Apr 2016 23:20:03 +0300 > Committer: Ingo Molnar <mi...@kernel.org> > CommitDate: Tue, 3 May 2016 08:37:59 +0200 > > signals/sigaltstack: Prepare to add new SS_xxx flags > > This patch adds SS_FLAG_BITS - the mask that splits sigaltstack > mode values and bit-flags. Since there is no bit-flags yet, the > mask is defined to 0. The flags are added by subsequent patches. > With every new flag, the mask should have the appropriate bit cleared. > > This makes sure if some flag is tried on a kernel that doesn't > support it, the -EINVAL error will be returned, because such a > flag will be treated as an invalid mode rather than the bit-flag. > > That way the existence of the particular features can be probed > at run-time. > > This change was suggested by Andy Lutomirski: > > https://lkml.org/lkml/2016/3/6/158
LGTM.
