linux-kernel - Re: [PATCH 00/18] x86: Ticket lock + cmpxchg cleanup

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Date:	Wed, 24 Aug 2011 14:46:26 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 00/18] x86: Ticket lock + cmpxchg cleanup

On 08/24/2011 02:36 PM, Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
>
> Hi all,
>
> Another spin of the cmpxchg/xadd/ticketlock cleanups.
>
> Changes from last post:
>   - reorder all the cmpxchg/xadd patches first
>   - change xadd to return prev rather than implicitly update arg
>   - recast ticketlock cleanup in terms of xadd
>   - drop conversion of unlock to C
>
> This is also available at:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git upstream/ticketlock-cleanup
>
>  arch/x86/include/asm/atomic.h         |    8 +-
>  arch/x86/include/asm/atomic64_64.h    |    6 +-
>  arch/x86/include/asm/cacheflush.h     |    2 +-
>  arch/x86/include/asm/cmpxchg.h        |  232 +++++++++++++++++++++++++++++++++
>  arch/x86/include/asm/cmpxchg_32.h     |  128 ++----------------
>  arch/x86/include/asm/cmpxchg_64.h     |  131 -------------------
>  arch/x86/include/asm/rwsem.h          |   15 +--
>  arch/x86/include/asm/spinlock.h       |  110 ++++------------
>  arch/x86/include/asm/spinlock_types.h |   22 +++-
>  arch/x86/include/asm/uv/uv_bau.h      |    6 +-
>  arch/x86/kernel/acpi/boot.c           |   10 +-
>  arch/x86/kernel/cpu/mcheck/mce.c      |    2 +-
>  arch/x86/xen/p2m.c                    |   10 +-
>  13 files changed, 311 insertions(+), 371 deletions(-)
>
> Thanks,
> 	J

Uh, that's 00/12, and ignore the below; that's left over from the
previous posting.

    J

>
> Jeremy Fitzhardinge (18):
>   x86/ticketlock: clean up types and accessors
>   x86/ticketlock: convert spin loop to C
>   x86/ticketlock: Use C for __ticket_spin_unlock
>   x86/ticketlock: make large and small ticket versions of spin_lock the
>     same
>   x86/ticketlock: make __ticket_spin_lock common
>   x86/ticketlock: make __ticket_spin_trylock common
>   x86: add xadd helper macro
>   x86/ticketlock: use xadd helper
>   x86/cmpxchg: linux/alternative.h has LOCK_PREFIX
>   x86/cmpxchg: move 32-bit __cmpxchg_wrong_size to match 64 bit.
>   x86/cmpxchg: move 64-bit set64_bit() to match 32-bit
>   x86/cmpxchg: unify cmpxchg into cmpxchg.h
>   x86: add cmpxchg_flag() variant
>   x86/ticketlocks: use cmpxchg_flag for trylock
>   x86: use cmpxchg_flag() where applicable
>   x86: report xchg/cmpxchg/xadd usage errors consistently
>   x86: add local and sync variants of xadd
>   x86: use xadd helper more widely
>
>  arch/x86/include/asm/atomic.h         |    4 +-
>  arch/x86/include/asm/atomic64_64.h    |    4 +-
>  arch/x86/include/asm/cacheflush.h     |    2 +-
>  arch/x86/include/asm/cmpxchg.h        |  223 +++++++++++++++++++++++++++++++++
>  arch/x86/include/asm/cmpxchg_32.h     |  128 ++-----------------
>  arch/x86/include/asm/cmpxchg_64.h     |  131 -------------------
>  arch/x86/include/asm/rwsem.h          |   11 +--
>  arch/x86/include/asm/spinlock.h       |  140 +++++++--------------
>  arch/x86/include/asm/spinlock_types.h |   22 +++-
>  arch/x86/include/asm/uv/uv_bau.h      |    4 +-
>  arch/x86/kernel/acpi/boot.c           |   10 +-
>  arch/x86/kernel/cpu/mcheck/mce.c      |    2 +-
>  arch/x86/xen/p2m.c                    |   10 +-
>  13 files changed, 321 insertions(+), 370 deletions(-)
>

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