linux-kernel - Re: [PATCH] hw_breakpoint: remove sample code from hw

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Date:	Tue, 7 Jul 2009 23:04:12 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Alan Stern <stern@...land.harvard.edu>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hw_breakpoint: remove sample code from hw_breakpoint.h

On Tue, Jul 07, 2009 at 01:40:11PM +0800, Li Zefan wrote:
> The sample code is a bit out-dated, and there's already a
> sample in sample/hw_breakpoint/.


IMHO these bits of comments are useful and don't overlap the role
of the samples in sample/
They only stand there as a quick summup.

No?

 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>  include/asm-generic/hw_breakpoint.h |   41 +---------------------------------
>  1 files changed, 2 insertions(+), 39 deletions(-)
> 
> diff --git a/include/asm-generic/hw_breakpoint.h b/include/asm-generic/hw_breakpoint.h
> index 9bf2d12..30ab37c 100644
> --- a/include/asm-generic/hw_breakpoint.h
> +++ b/include/asm-generic/hw_breakpoint.h
> @@ -60,45 +60,8 @@
>   * Breakpoints are disabled during execution @triggered, to avoid
>   * recursive traps and allow unhindered access to breakpointed memory.
>   *
> - * This sample code sets a breakpoint on pid_max and registers a callback
> - * function for writes to that variable.  Note that it is not portable
> - * as written, because not all architectures support HW_BREAKPOINT_LEN_4.
> - *
> - * ----------------------------------------------------------------------
> - *
> - * #include <asm/hw_breakpoint.h>
> - *
> - * struct hw_breakpoint my_bp;
> - *
> - * static void my_triggered(struct hw_breakpoint *bp, struct pt_regs *regs)
> - * {
> - * 	printk(KERN_DEBUG "Inside triggered routine of breakpoint exception\n");
> - * 	dump_stack();
> - *  	.......<more debugging output>........
> - * }
> - *
> - * static struct hw_breakpoint my_bp;
> - *
> - * static int init_module(void)
> - * {
> - *	..........<do anything>............
> - *	my_bp.info.type = HW_BREAKPOINT_WRITE;
> - *	my_bp.info.len = HW_BREAKPOINT_LEN_4;
> - *
> - *	my_bp.installed = (void *)my_bp_installed;
> - *
> - *	rc = register_kernel_hw_breakpoint(&my_bp);
> - *	..........<do anything>............
> - * }
> - *
> - * static void cleanup_module(void)
> - * {
> - *	..........<do anything>............
> - *	unregister_kernel_hw_breakpoint(&my_bp);
> - *	..........<do anything>............
> - * }
> - *
> - * ----------------------------------------------------------------------
> + * See sample/hw_breakpoint/ for a sample that sets a breakpoint on
> + * a specified kernel symbol.
>   */
>  struct hw_breakpoint {
>  	void (*triggered)(struct hw_breakpoint *, struct pt_regs *);
> -- 
> 1.5.4.rc3

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