From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756742Ab3BAK2M (ORCPT ); Fri, 1 Feb 2013 05:28:12 -0500 Received: from e28smtp06.in.ibm.com ([122.248.162.6]:49197 "EHLO e28smtp06.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755317Ab3BAK2F (ORCPT ); Fri, 1 Feb 2013 05:28:05 -0500 From: Li Zhong To: linux-kernel@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, paulmck@linux.vnet.ibm.com, fweisbec@gmail.com, benh@kernel.crashing.org, paulus@samba.org, Li Zhong Subject: [RFC PATCH 3/5] powerpc: Exit user context on notify resume Date: Fri, 1 Feb 2013 18:27:43 +0800 Message-Id: <1359714465-6297-4-git-send-email-zhong@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1359714465-6297-1-git-send-email-zhong@linux.vnet.ibm.com> References: <1359714465-6297-1-git-send-email-zhong@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13020110-9574-0000-0000-0000066D67D2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch allows RCU usage in do_notify_resume, e.g. signal handling. It corresponds to [PATCH] x86: Exit RCU extended QS on notify resume commit edf55fda35c7dc7f2d9241c3abaddaf759b457c6 Signed-off-by: Li Zhong --- arch/powerpc/kernel/signal.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index 3b99711..c1eaea2 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -158,6 +159,8 @@ static int do_signal(struct pt_regs *regs) void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) { + user_exit(); + if (thread_info_flags & _TIF_UPROBE) uprobe_notify_resume(regs); @@ -168,6 +171,8 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); } + + user_enter(); } long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, -- 1.7.9.5