From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id BCEDB1A0216 for ; Fri, 9 Oct 2015 01:49:02 +1100 (AEDT) Received: from e23smtp01.au.ibm.com (e23smtp01.au.ibm.com [202.81.31.143]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 0ABA5140DDA for ; Fri, 9 Oct 2015 01:49:02 +1100 (AEDT) Received: from /spool/local by e23smtp01.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 9 Oct 2015 00:49:01 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 39AC52BB0051 for ; Fri, 9 Oct 2015 01:48:59 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t98EmoRh15663340 for ; Fri, 9 Oct 2015 01:48:59 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t98EmO3N005524 for ; Fri, 9 Oct 2015 01:48:26 +1100 From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org Cc: peterz@infradead.org, akpm@linux-foundation.org, tglx@linutronix.de, james.hogan@imgtec.com, avagin@openvz.org, Paul.Clothier@imgtec.com, palves@redhat.com, oleg@redhat.com, dhowells@redhat.com, davej@redhat.com, davem@davemloft.net, mikey@neuling.org, benh@kernel.crashing.org, sukadev@linux.vnet.ibm.com, mpe@ellerman.id.au, sam.bobroff@au1.ibm.com, kirjanov@gmail.com, shuahkh@osg.samsung.com, Ulrich.Weigand@de.ibm.com, emachado@linux.vnet.ibm.com Subject: [PATCH V9 02/28] powerpc, process: Add the function flush_tmregs_to_thread Date: Thu, 8 Oct 2015 20:17:23 +0530 Message-Id: <1444315669-23487-3-git-send-email-khandual@linux.vnet.ibm.com> In-Reply-To: <1444315669-23487-1-git-send-email-khandual@linux.vnet.ibm.com> References: <1444315669-23487-1-git-send-email-khandual@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This patch creates a function flush_tmregs_to_thread which will then be used by subsequent patches in this series. The function checks for self tracing ptrace interface attempts while in the TM context and logs appropriate warning message. Signed-off-by: Anshuman Khandual --- arch/powerpc/include/asm/switch_to.h | 8 ++++++++ arch/powerpc/kernel/process.c | 20 ++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index 15cca17..ff027e3 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -83,6 +83,14 @@ static inline void flush_spe_to_thread(struct task_struct *t) } #endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +extern void flush_tmregs_to_thread(struct task_struct *); +#else +static inline void flush_tmregs_to_thread(struct task_struct *t) +{ +} +#endif + static inline void clear_task_ebb(struct task_struct *t) { #ifdef CONFIG_PPC_BOOK3S_64 diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 75b6676..c461084 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -742,6 +742,26 @@ void restore_tm_state(struct pt_regs *regs) #define __switch_to_tm(prev) #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +void flush_tmregs_to_thread(struct task_struct *tsk) +{ + /* + * Process self tracing is not yet supported through + * ptrace interface. Ptrace generic code should have + * prevented this from happening in the first place. + * Warn once here with the message, if some how it + * is attempted. + */ + WARN_ONCE(tsk == current, + "Not expecting ptrace on self: TM regs may be incorrect\n"); + + /* + * If task is not current, it should have been flushed + * already to it's thread_struct during __switch_to(). + */ +} +#endif + struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *new) { -- 2.1.0