linux-kernel - Re: [PATCH v5 18/32] signal: Consolidate {TS,TLF}_RESTORE

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Date:	Tue, 12 Jul 2016 07:57:31 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Nadav Amit <nadav.amit@...il.com>,
	Kees Cook <keescook@...omium.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jann Horn <jann@...jh.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Michal Simek <monstr@...str.eu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Rich Felker <dalias@...c.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...lanox.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...e.de>,
	Dmitry Safonov <dsafonov@...tuozzo.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH v5 18/32] signal: Consolidate {TS,TLF}_RESTORE_SIGMASK code

On Mon, Jul 11, 2016 at 4:53 PM, Andy Lutomirski <luto@...nel.org> wrote:
> In general, there's no need for the "restore sigmask" flag to live in
> ti->flags.  alpha, ia64, microblaze, powerpc, sh, sparc (64-bit only),
> tile, and x86 use essentially identical alternative implementations,
> placing the flag in ti->status.
>
> Replace those optimized implementations with an equally good common
> implementation that stores it in a bitfield in struct task_struct
> and drop the custom implementations.
>
> Additional architectures can opt in by removing their
> TIF_RESTORE_SIGMASK defines.

There is a small typo in the subject, should be "signal: Consolidate
{TS,TIF}_RESTORE_SIGMASK code"

--
Brian Gerst