From: Miroslav Benes <mbenes@suse.cz>
To: jpoimboe@redhat.com
Cc: jikos@kernel.org, jeyu@redhat.com, linux-kernel@vger.kernel.org,
        live-patching@vger.kernel.org, vojtech@suse.com, jslaby@suse.cz,
        pmladek@suse.cz, Miroslav Benes <mbenes@suse.cz>
Subject: [RFC PATCH 0/2] s390/klp: s390 support
Date: Mon, 18 Apr 2016 17:01:08 +0200
Message-Id: <1460991670-32187-1-git-send-email-mbenes@suse.cz>
In-Reply-To: <20160414133951.eydmvevb65jzse5e@treble>
References: <20160414133951.eydmvevb65jzse5e@treble>
Sender: linux-kernel-owner@vger.kernel.org
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So this is something we have in kGraft for a while (though the actual
implementation in s390's entry.S differs).

The first patch is needed because we want our TIF flag to be part of
_TIF_WORK and s390's tm instruction tests only 8-bits.

The second patch adds a call to klp_update_task_universe() to entry.S.
Specifically to syscall and interrupt return paths.

WARNING: It is only compile-tested. It even cannot be linked, because
klp_update_task_universe() is static inline. Josh, you're gonna change
this part anyway to remove TIF_KLP_NEED_UPDATE from arch-independent
code, aren't you? 

Comments are obviously welcome. s390 maintainters not CC'ed yet.

Jiri Slaby (1):
  s390: livepatch, reorganize TIF bits

Miroslav Benes (1):
  s390/klp: update task universe when exiting kernel

 arch/s390/include/asm/thread_info.h | 24 ++++++++++++++++--------
 arch/s390/kernel/entry.S            | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 46 insertions(+), 9 deletions(-)

-- 
2.8.1