linux-kernel - [PATCH v2 0/4] vDSO fixes, on top of tip/x86/vdso

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Date:	Thu, 27 Feb 2014 16:18:11 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Stefani Seibold <stefani@...bold.net>, X86 ML <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	andriy.shevchenko@...ux.intel.com, Martin.Runge@...de-schwarz.com,
	Andreas.Brief@...de-schwarz.com,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v2 0/4] vDSO fixes, on top of tip/x86/vdso

I'd still like someone else to confirm that the 32-bit vDSO is working
on all common configurations before I'm happy with it, but this should
be a considerable improvement.

Someone who maintains the clock code should review the changes in:

    commit 0fc8a237cbe98a06962f5ea37d24fc2369e23c74
    Author: Stefani Seibold <stefani@...bold.net>
    Date:   Wed Feb 19 10:09:10 2014 +0100
    
        x86, vdso: Add 32-bit VDSO time support for the 64-bit kernel

very carefully.

There's still something extremely questionable about VDSO_PAGES in the
32-bit vDSO code.  It appears to be terminally screwed up, and AFAICS it
only works at all because none of the 32-bit vDSO images ever exceed
4096 bytes.

Note: Patch 4 fixes a bug that's present even in -linus, so it might
make sense to send it to Linus more quickly than the rest of this
series.

Changes from v1:
 - Adjust CFLAGS instead of using asmlinkage.
 - Add more fixes.

Andy Lutomirski (4):
  x86: Use the default ABI for the 32-bit vDSO
  x86: Inline the CLOCK_MONOTONIC vdso code
  x86: Patch alternatives in the 32-bit vDSO
  x86: Zero-pad the VVAR page

 arch/x86/include/asm/vdso.h    |  2 ++
 arch/x86/kernel/vmlinux.lds.S  |  5 +++++
 arch/x86/vdso/Makefile         |  2 +-
 arch/x86/vdso/vclock_gettime.c |  2 +-
 arch/x86/vdso/vdso32-setup.c   | 25 +++++++++++++------------
 arch/x86/vdso/vma.c            |  9 ++++++---
 6 files changed, 28 insertions(+), 17 deletions(-)

-- 
1.8.5.3

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