From: Li Zhong <zhong@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: Li Zhong <zhong@linux.vnet.ibm.com>,
fweisbec@gmail.com, paulus@samba.org, paulmck@linux.vnet.ibm.com,
linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH 3/5] powerpc: Exit user context on notify resume
Date: Fri, 1 Feb 2013 18:27:43 +0800 [thread overview]
Message-ID: <1359714465-6297-4-git-send-email-zhong@linux.vnet.ibm.com> (raw)
In-Reply-To: <1359714465-6297-1-git-send-email-zhong@linux.vnet.ibm.com>
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@linux.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 3b99711..c1eaea2 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>
@@ -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
next prev parent reply other threads:[~2013-02-01 10:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-01 10:27 [RFC PATCH 0/5] powerpc: Support context tracking for Power pSeries Li Zhong
2013-02-01 10:27 ` [RFC PATCH 1/5] powerpc: Syscall hooks for context tracking subsystem Li Zhong
2013-02-07 0:29 ` Frederic Weisbecker
2013-02-07 8:53 ` Li Zhong
2013-02-07 16:09 ` Frederic Weisbecker
2013-02-10 10:32 ` Frederic Weisbecker
2013-02-01 10:27 ` [RFC PATCH 2/5] powerpc: Exception " Li Zhong
2013-02-10 14:10 ` Frederic Weisbecker
2013-02-16 9:41 ` Li Zhong
2013-02-01 10:27 ` Li Zhong [this message]
2013-02-01 10:27 ` [RFC PATCH 4/5] powerpc: Use the new schedule_user API on userspace preemption Li Zhong
2013-02-01 10:27 ` [RFC PATCH 5/5] powerpc: select HAVE_CONTEXT_TRACKING for pSeries Li Zhong
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