Patchwork [RFC,3/5] powerpc: Exit user context on notify resume

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Submitter Li Zhong
Date Feb. 1, 2013, 10:27 a.m.
Message ID <1359714465-6297-4-git-send-email-zhong@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/217413/
State Superseded, archived
Headers show

Comments

Li Zhong - Feb. 1, 2013, 10:27 a.m.
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(+)

Patch

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,