linux-kernel - Re: [patch 00/11] Hardware Breakpoint interfaces

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Date:	Tue, 10 Mar 2009 14:46:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	prasad@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [patch 00/11] Hardware Breakpoint interfaces

* prasad@...ux.vnet.ibm.com <prasad@...ux.vnet.ibm.com> wrote:

> Hi Ingo,

> 	Please find the revised set of patches that implement 
> Hardware Breakpoint (or watchpoint) registers and an 
> arch-specific implementation for x86/x86_64.

General structure looks good, with a good deal of details 
that need to be addressed.

Firstly, as far as i can see this should work on 32-bit too, 
correct?

Secondly, what about other architectures - will they build just 
fine without any arch level glue code? kernel/hw_breakpoint.o 
get build unconditionally - without any benefit to non-x86 code. 
Perhaps an ARCH_HAS_HW_BREAKPOINTS Kconfig method would be 
useful to add.

There's also a number of (small) style issues. 
kernel/hw_breakpoint.c and other new .c files dont comply to the 
customary comment style of:

  /*
   * Comment .....
   * ...... goes here:
   */

also, the #include files section style should match that of 
arch/x86/mm/fault.c - it's a conflict-avoidance style.

also, things like this:

static struct notifier_block hw_breakpoint_exceptions_nb = {
        .notifier_call = hw_breakpoint_exceptions_notify,
        .priority = 0x7fffffff /* we need to be notified first */
};

should be:

static struct notifier_block hw_breakpoint_exceptions_nb = {
        .notifier_call		= hw_breakpoint_exceptions_notify,
	/* We need to be notified first: */
        .priority		= 0x7fffffff,
};

	Ingo
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