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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 edf55fda35

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Li Zhong 2013-05-13 16:16:42 +00:00 committed by Benjamin Herrenschmidt
parent ba12eedee3
commit 106ed886ab
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/kernel/signal.c
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@ -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();
}