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authorLi Zhong <zhong@linux.vnet.ibm.com>2013-05-13 16:16:42 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-14 16:00:20 +1000
commit106ed886abc46723c290e82e5f161d9b40820203 (patch)
tree70fd4f2b40bea53c0bf1d8bfa2bf133870f371a6
parentba12eedee321eeb5baecaada285daeb3462c35f5 (diff)
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@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/kernel/signal.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index cf12eae02de5..d63b5024c563 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();
}