linux-kernel - [Patch 0/2 v2] Improvements for hw_breakpoint

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Date:	Thu, 28 Jan 2010 16:43:47 +0530
From:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Roland McGrath <roland@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: [Patch 0/2 v2] Improvements for hw_breakpoint_handler()

Hi Frederic,
        Can you please pull the second version of the patch which perform
the  following.

Patch 1/2: Clears the arch-reserved bits from debug status register. This
helps easy bitwise operations - such as the check for non-trap bits in
hw_breakpoint_handler. A check for the same using
"if (dr6 & (~DR_TRAP_BITS))" throws incorrect results due to the
presence of preset reserved bits.

Patch 2/2: Return NOTIFY_DONE from hw_breakpoint_handler() for interested
user-space breakpoints (and not unconditionally) since this could lead to
further processing in do_debug() with undesirable consequences.

Changelog ver II
----------------
Version I: LKML ref: 20091226182519.GA9494@...ibm.com

- Return NOTIFY_DONE for further processing (i.e. signal delivery) only for
  interested user-space breakpoints i.e. with current->thread.debugreg6 bits
  set.

Thanks,
K.Prasad

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