linux-kernel - [PATCH v2 0/2] x86/entry: Do context tracking with IRQs off (finally!)

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Message-Id: <cover.1457558566.git.luto@kernel.org>
Date:	Wed,  9 Mar 2016 13:24:03 -0800
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
	Brian Gerst <brgerst@...il.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v2 0/2] x86/entry: Do context tracking with IRQs off (finally!)

This provides no direct benefit by itself, but it finally lets us
apply some of the speedups that Paolo and possible Rik independently
wrote: we won't need an irqsave/irqrestore pair in the context
tracking code.

It should also let us remove the last callers of exception_enter in
x86 kernels, but that removal should probably wait until I carefully
re-read the page fault code.

Changes from v1:
 - Fix a comment
 - Make the ifdeffery less messy

Andy Lutomirski (2):
  x86/entry/32: Change INT80 to be an interrupt gate
  x86/entry: Do enter_from_user_mode with IRQs off

 arch/x86/entry/common.c            | 48 +++++++++++---------------------------
 arch/x86/entry/entry_32.S          |  8 +++----
 arch/x86/entry/entry_64_compat.S   |  2 +-
 arch/x86/include/asm/thread_info.h |  5 +++-
 arch/x86/kernel/traps.c            |  2 +-
 5 files changed, 24 insertions(+), 41 deletions(-)

-- 
2.5.0