linux-kernel - Re: [tip:core/signals] signals/sigaltstack: Prepare to add new SS

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Date:	Tue, 3 May 2016 09:13:53 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Peter Zijlstra <peterz@...radead.org>,
	"Amanieu d'Antras" <amanieu@...il.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Shuah Khan <shuahkh@....samsung.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Richard Weinberger <richard@....at>,
	Brian Gerst <brgerst@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Stas Sergeev <stsp@...t.ru>, Al Viro <viro@...iv.linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>
Cc:	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:core/signals] signals/sigaltstack: Prepare to add new SS_xxx flags

On Tue, May 3, 2016 at 12:50 AM, tip-bot for Stas Sergeev
<tipbot@...or.com> wrote:
> Commit-ID:  407bc16ad1769f5cb8ad9555611cb198187ef4cd
> Gitweb:     http://git.kernel.org/tip/407bc16ad1769f5cb8ad9555611cb198187ef4cd
> Author:     Stas Sergeev <stsp@...t.ru>
> AuthorDate: Thu, 14 Apr 2016 23:20:03 +0300
> Committer:  Ingo Molnar <mingo@...nel.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.