From patchwork Fri Feb 1 10:27:43 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [RFC,3/5] powerpc: Exit user context on notify resume From: Li Zhong X-Patchwork-Id: 217413 Message-Id: <1359714465-6297-4-git-send-email-zhong@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: Li Zhong , fweisbec@gmail.com, paulus@samba.org, paulmck@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org Date: Fri, 1 Feb 2013 18:27:43 +0800 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,