From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wkFYC3J62zDqNp for ; Fri, 9 Jun 2017 05:17:19 +1000 (AEST) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v58JE4pu094267 for ; Thu, 8 Jun 2017 15:17:16 -0400 Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ay49hfx65-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 08 Jun 2017 15:17:16 -0400 Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 9 Jun 2017 05:17:14 +1000 Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay06.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v58JHB3858130464 for ; Fri, 9 Jun 2017 05:17:11 +1000 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v58JH3A6020922 for ; Fri, 9 Jun 2017 05:17:03 +1000 From: "Naveen N. Rao" To: Michael Ellerman Cc: Ananth N Mavinakayanahalli , Masami Hiramatsu , linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc/kprobes: Don't save/restore DAR/DSISR to/from pt_regs for optprobes Date: Fri, 9 Jun 2017 00:46:55 +0530 Message-Id: <20170608191655.19469-1-naveen.n.rao@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , We don't save/restore these across a trap, or with KPROBES_ON_FTRACE. Signed-off-by: Naveen N. Rao --- arch/powerpc/kernel/optprobes_head.S | 8 -------- 1 file changed, 8 deletions(-) diff --git a/arch/powerpc/kernel/optprobes_head.S b/arch/powerpc/kernel/optprobes_head.S index 4937bef7652f..52fc864cdec4 100644 --- a/arch/powerpc/kernel/optprobes_head.S +++ b/arch/powerpc/kernel/optprobes_head.S @@ -60,10 +60,6 @@ optprobe_template_entry: std r5,_CCR(r1) lbz r5,PACASOFTIRQEN(r13) std r5,SOFTE(r1) - mfdar r5 - std r5,_DAR(r1) - mfdsisr r5 - std r5,_DSISR(r1) /* * We may get here from a module, so load the kernel TOC in r2. @@ -122,10 +118,6 @@ optprobe_template_call_emulate: mtxer r5 ld r5,_CCR(r1) mtcr r5 - ld r5,_DAR(r1) - mtdar r5 - ld r5,_DSISR(r1) - mtdsisr r5 REST_GPR(0,r1) REST_10GPRS(2,r1) REST_10GPRS(12,r1) -- 2.12.2