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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 /arch
parent455e987c0c2eb2c9045dc854559474cf41509965 (diff)
parent745040347d7e8e7b47e3790de76423d9eab474eb (diff)
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()
Diffstat (limited to 'arch')
-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 5e0596b0632..974b67e46dd 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)))