linux-kernel - [RFC PATCH 0/2] hw-breakpoints allocation constraints updates

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Date:	Tue, 13 Apr 2010 01:01:18 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Will Deacon <will.deacon@....com>,
	Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
	"K . Prasad" <prasad@...ux.vnet.ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: [RFC PATCH 0/2] hw-breakpoints allocation constraints updates

Hi,

These patches tend to extend the breakpoint allocation constraints to
be more non-x86 friendly.

It can separate the data and instruction breakpoint space and
handle address ranges or other kind of tricky things that makes
a breakpoint use more than one address register.

There is still one kind of constraint it can't handle, something
I've found on ARMv7 implementation: linking an breakpoint to a
watchpoint. But if this needs arises, I will be glad to add that
support.

Beware, it's only compile-tested for now.

Tell me what you think.

Thanks.

Frederic Weisbecker (2):
  hw-breakpoints: Separate constraint space for data and instruction
    breakpoints
  hw-breakpoints: Handle breakpoint weight in allocation constraints

 arch/Kconfig                  |   11 ++++
 arch/x86/Kconfig              |    1 +
 include/linux/hw_breakpoint.h |    9 ++-
 kernel/hw_breakpoint.c        |  129 ++++++++++++++++++++++++++++++-----------
 4 files changed, 112 insertions(+), 38 deletions(-)

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