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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-01 13:08:36 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-01 13:08:36 -0800
commitb3c3a9cf2a28ee4a8d0b62e2e58c61e9ca9bb47b (patch)
tree4066d1bcc600dfde34fd447ee4acdc89e40c3826
parent455e987c0c2eb2c9045dc854559474cf41509965 (diff)
parent745040347d7e8e7b47e3790de76423d9eab474eb (diff)
downloadlinux-b3c3a9cf2a28ee4a8d0b62e2e58c61e9ca9bb47b.tar.bz2
Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU fix from Ingo Molnar: "Fix leaking RCU extended quiescent state, which might trigger warnings and mess up the extended quiescent state tracking logic into thinking that we are in "RCU user mode" while we aren't." * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rcu: Fix unrecovered RCU user mode in syscall_trace_leave()
-rw-r--r--arch/x86/kernel/ptrace.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 5e0596b0632e..974b67e46dd0 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -1541,6 +1541,13 @@ void syscall_trace_leave(struct pt_regs *regs)
{
bool step;
+ /*
+ * We may come here right after calling schedule_user()
+ * or do_notify_resume(), in which case we can be in RCU
+ * user mode.
+ */
+ rcu_user_exit();
+
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))