linux-kernel - [PATCH v3 0/4] vDSO reference parser updates and Go workaround

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Date:	Thu, 12 Jun 2014 17:53:08 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	<hpa@...or.com>, Kui Zhang <kuizhang@...il.com>
Cc:	x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v3 0/4] vDSO reference parser updates and Go workaround

Patches 1 and 2 update the vDSO reference parser.

Despite the late submission, this might be 3.16 material: it's just
documentation.  If I'd been more on top of this, I would have done it
for 3.15.  It's also probably worthwhile given that there is at least
one rather buggy vDSO parser in the wild.

Patches 3 and 4 make "Hello world" as built by Go stop segfaulting.
It's a performance regression for Go programs: it causes them to stop
finding any symbols in the vDSO, but that's a lot better than
segfaulting.

Changes from v1:
 - Improve portability of the vdso parser.
 - Add an explicit ELFCLASS check in the vdso parser (why not?).
 - Fix x32 build.
 - Add a comment describing what the hack works around, why, and where the
   Go bug was introduced.

Changes from v2: Re-add patch 1.  Whoops.

Andy Lutomirski (4):
  doc,vdso: Rename vdso_test.c to vdso_standalone_test_x86.c
  doc,vdso: Make vDSO examples more portable
  x86,vdso: Add PUT_LE to store little-endian values
  x86,vdso: Hack to keep 64-bit Go programs working

 Documentation/vDSO/parse_vdso.c               |  67 ++++++++------
 Documentation/vDSO/vdso_standalone_test_x86.c | 128 ++++++++++++++++++++++++++
 Documentation/vDSO/vdso_test.c                | 107 +++++----------------
 arch/x86/vdso/Makefile                        |  18 ++--
 arch/x86/vdso/vdso-fakesections.c             |  32 +++++++
 arch/x86/vdso/vdso2c.c                        |  19 +++-
 arch/x86/vdso/vdso2c.h                        |  23 ++++-
 7 files changed, 268 insertions(+), 126 deletions(-)
 create mode 100644 Documentation/vDSO/vdso_standalone_test_x86.c
 create mode 100644 arch/x86/vdso/vdso-fakesections.c

-- 
1.9.3

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