linux-kernel - [RFC PATCH v4 3/5] powerpc: Exit user context on notify resume

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Message-Id: <1368497804-21706-4-git-send-email-zhong@linux.vnet.ibm.com>
Date:	Tue, 14 May 2013 10:16:42 +0800
From:	Li Zhong <zhong@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	linuxppc-dev@...ts.ozlabs.org, paulmck@...ux.vnet.ibm.com,
	fweisbec@...il.com, benh@...nel.crashing.org, paulus@...ba.org,
	michael@...erman.id.au, Li Zhong <zhong@...ux.vnet.ibm.com>
Subject: [RFC PATCH v4 3/5] powerpc: Exit user context on notify resume

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 <zhong@...ux.vnet.ibm.com>
---
 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 cf12eae..d63b502 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -13,6 +13,7 @@
 #include <linux/signal.h>
 #include <linux/uprobes.h>
 #include <linux/key.h>
+#include <linux/context_tracking.h>
 #include <asm/hw_breakpoint.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -159,6 +160,8 @@ 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);
 
@@ -169,4 +172,6 @@ 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();
 }
-- 
1.7.9.5

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