linux-kernel - Re: [PATCH v12 11/11] sparc64: Update signal delivery to use new helper functions

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Date:   Wed, 21 Feb 2018 14:59:11 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     davem@...emloft.net, dave.hansen@...ux.intel.com,
        anthony.yznaga@...cle.com, rob.gardner@...cle.com,
        mingo@...nel.org, jane.chu@...cle.com, vegard.nossum@...cle.com,
        linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [PATCH v12 11/11] sparc64: Update signal delivery to use new helper functions

Khalid Aziz <khalid.aziz@...cle.com> writes:

> Commit f8ec66014ffd ("signal: Add send_sig_fault and force_sig_fault")
> added new helper functions to streamline signal delivery. This patch
> updates signal delivery for new/updated handlers for ADI related
> exceptions to use the helper function.
>
> Signed-off-by: Khalid Aziz <khalid.aziz@...cle.com>
> Cc: Khalid Aziz <khalid@...ehiking.org>

Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

> ---
> v12:
> 	- new patch
>
>  arch/sparc/kernel/traps_64.c | 38 +++++++++-----------------------------
>  1 file changed, 9 insertions(+), 29 deletions(-)
>
> diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
> index f36a40217f6c..462a21abd105 100644
> --- a/arch/sparc/kernel/traps_64.c
> +++ b/arch/sparc/kernel/traps_64.c
> @@ -362,7 +362,6 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
>  {
>  	unsigned short type = (type_ctx >> 16);
>  	unsigned short ctx  = (type_ctx & 0xffff);
> -	siginfo_t info;
>  
>  	if (notify_die(DIE_TRAP, "data access exception", regs,
>  		       0, 0x8, SIGTRAP) == NOTIFY_STOP)
> @@ -406,24 +405,18 @@ void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsig
>  	 * kerbel by HV as data access exception with fault type set to
>  	 * HV_FAULT_TYPE_INV_ASI.
>  	 */
> -	info.si_errno = 0;
> -	info.si_addr = (void __user *) addr;
> -	info.si_trapno = 0;
>  	switch (type) {
>  	case HV_FAULT_TYPE_INV_ASI:
> -		info.si_signo = SIGILL;
> -		info.si_code = ILL_ILLADR;
> -		force_sig_info(SIGILL, &info, current);
> +		force_sig_fault(SIGILL, ILL_ILLADR, (void __user *)addr, 0,
> +				current);
>  		break;
>  	case HV_FAULT_TYPE_MCD_DIS:
> -		info.si_signo = SIGSEGV;
> -		info.si_code = SEGV_ACCADI;
> -		force_sig_info(SIGSEGV, &info, current);
> +		force_sig_fault(SIGSEGV, SEGV_ACCADI, (void __user *)addr, 0,
> +				current);
>  		break;
>  	default:
> -		info.si_signo = SIGSEGV;
> -		info.si_code = SEGV_MAPERR;
> -		force_sig_info(SIGSEGV, &info, current);
> +		force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)addr, 0,
> +				current);
>  		break;
>  	}
>  }
> @@ -2073,8 +2066,6 @@ static void sun4v_log_error(struct pt_regs *regs, struct sun4v_error_entry *ent,
>   */
>  void do_mcd_err(struct pt_regs *regs, struct sun4v_error_entry ent)
>  {
> -	siginfo_t info;
> -
>  	if (notify_die(DIE_TRAP, "MCD error", regs, 0, 0x34,
>  		       SIGSEGV) == NOTIFY_STOP)
>  		return;
> @@ -2110,12 +2101,8 @@ void do_mcd_err(struct pt_regs *regs, struct sun4v_error_entry ent)
>  	/* Send SIGSEGV to the userspace process with the right signal
>  	 * code
>  	 */
> -	info.si_signo = SIGSEGV;
> -	info.si_errno = 0;
> -	info.si_code = SEGV_ADIDERR;
> -	info.si_addr = (void __user *)ent.err_raddr;
> -	info.si_trapno = 0;
> -	force_sig_info(SIGSEGV, &info, current);
> +	force_sig_fault(SIGSEGV, SEGV_ADIDERR, (void __user *)ent.err_raddr,
> +			0, current);
>  }
>  
>  /* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate.
> @@ -2748,8 +2735,6 @@ void sun4v_do_mna(struct pt_regs *regs, unsigned long addr, unsigned long type_c
>  void sun4v_mem_corrupt_detect_precise(struct pt_regs *regs, unsigned long addr,
>  				      unsigned long context)
>  {
> -	siginfo_t info;
> -
>  	if (notify_die(DIE_TRAP, "memory corruption precise exception", regs,
>  		       0, 0x8, SIGSEGV) == NOTIFY_STOP)
>  		return;
> @@ -2784,12 +2769,7 @@ void sun4v_mem_corrupt_detect_precise(struct pt_regs *regs, unsigned long addr,
>  		regs->tpc &= 0xffffffff;
>  		regs->tnpc &= 0xffffffff;
>  	}
> -	info.si_signo = SIGSEGV;
> -	info.si_code = SEGV_ADIPERR;
> -	info.si_errno = 0;
> -	info.si_addr = (void __user *) addr;
> -	info.si_trapno = 0;
> -	force_sig_info(SIGSEGV, &info, current);
> +	force_sig_fault(SIGSEGV, SEGV_ADIPERR, (void __user *)addr, 0, current);
>  }
>  
>  void do_privop(struct pt_regs *regs)