linux-kernel - [PATCH 0/5] x86/asm/entry/64: simplifications

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Date:	Mon, 30 Mar 2015 20:09:30 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] x86/asm/entry/64: simplifications

This patchset simplifies jump maze in entry_64.S a bit by moving
"retint_kernel" code block, and follows up with simplifications
which become obvious after the move.

Two labels and one define is gone
One label is no longer .global
One redundand DISABLE_INTERRUPTS is gone
A few jump and test instructions use shorter forms now

   text           data     bss     dec     hex filename
  12706              0       0   12706    31a2 entry_64.o.before
  12658              0       0   12658    3172 entry_64.o

Patchset was run-tested (running it while writing this).

Denys Vlasenko (5):
  x86/asm/entry/64: move retint_kernel code block closer to its user
  x86/asm/entry/64: simplify retint_kernel label usage, make
    retint_restore_args label local
  x86/asm/entry/64: remove redundant DISABLE_INTERRUPTS
  x86/asm/entry/64: do not GET_THREAD_INFO() too early
  x86/asm/entry/64: drop exit_intr label

 arch/x86/kernel/entry_64.S | 40 +++++++++++++++++-----------------------
 1 file changed, 17 insertions(+), 23 deletions(-)
---
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: Ingo Molnar <mingo@...nel.org>
CC: Borislav Petkov <bp@...en8.de>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: Andy Lutomirski <luto@...capital.net>
CC: Oleg Nesterov <oleg@...hat.com>
CC: Frederic Weisbecker <fweisbec@...il.com>
CC: Alexei Starovoitov <ast@...mgrid.com>
CC: Will Drewry <wad@...omium.org>
CC: Kees Cook <keescook@...omium.org>
CC: x86@...nel.org
CC: linux-kernel@...r.kernel.org

-- 
1.8.1.4

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