On Tue, May 3, 2016 at 9:13 AM, Andy Lutomirski <l...@amacapital.net> wrote: > 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.
Correction: does not LGTM. In a sensible design, sigaltstack would report flags back to the caller. I will send a fix. --Andy
