linux-kernel - Re: [RFC][PATCH] Demultiplexing SIGTRAP signal

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Date:	Mon, 22 Sep 2008 16:54:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Srinivasa Ds <srinivasa@...ibm.com>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, paulus@...ba.org,
	linuxppc-dev@...abs.org, linux-parisc@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH] Demultiplexing SIGTRAP signal


* Srinivasa Ds <srinivasa@...ibm.com> wrote:

> --- linux-2.6.27-rc7.orig/arch/ia64/include/asm/siginfo.h
> +++ linux-2.6.27-rc7/arch/ia64/include/asm/siginfo.h

please do not send patches that modify include/asm/ files, the 
include/asm-x86/ file should be modified instead.

(this problem will go away in v2.6.28 when we'll move include/asm-x86/ 
to arch/x86/include/)

> +	si_code = get_si_code((unsigned long*)&condition);

coding style problem: please run checkpatch.

>  	/* Ok, finally something we can handle */
> -	send_sigtrap(tsk, regs, error_code);
> +	send_sigtrap(tsk, regs, error_code, si_code);

ok, that looks much nicer.

> -	info.si_code = TRAP_BRKPT;
> +	info.si_code = get_si_code(&condition);

no need to pass in the condition by reference.

> +#define TRAP_BRANCH     (__SI_FAULT|3)  /* process taken branch trap */
> +#define TRAP_HWBKPT     (__SI_FAULT|4)  /* hardware breakpoint or watchpoint 
> */

stray linewrapped patch line - see Documentation/email-clients.txt.

> -void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int 
> error_code)
> +void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int 
> error_code,

linewrap.

> +++ linux-2.6.27-rc7/include/asm-x86/traps.h
> @@ -36,6 +36,16 @@ void do_invalid_op(struct pt_regs *, lon
>  void do_general_protection(struct pt_regs *, long);
>  void do_nmi(struct pt_regs *, long);
>  
> +int get_si_code(unsigned long *condition)
> +{
> +	if (*condition & DR_STEP)
> +		return TRAP_TRACE;

please declare inline functions explicitly as 'static inline'.

	Ingo
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