x86/traps: Weaken context tracking entry assertions

We were asserting that we were all the way in CONTEXT_KERNEL
when exception handlers were called. While having this be true
is, I think, a nice goal (or maybe a variant in which we assert
that we're in CONTEXT_KERNEL or some new IRQ context), we're not
quite there.

In particular, if an IRQ interrupts the SYSCALL prologue and the
IRQ handler in turn causes an exception, the exception entry
will be called in RCU IRQ mode but with CONTEXT_USER.

This is okay (nothing goes wrong), but until we fix up the
SYSCALL prologue, we need to avoid warning.

Signed-off-by: Andy Lutomirski <[e-mail]>
Acked-by: Frederic Weisbecker <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Brian Gerst <[e-mail]>
Cc: Denys Vlasenko <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Oleg Nesterov <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Sasha Levin <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/kernel/traps.c

···
 void ist_enter(struct pt_regs *regs)
 {
 	if (user_mode(regs)) {
-		CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+		rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	} else {
 		/*
 		 * We might have interrupted pretty much anything.  In
···
 {
 	siginfo_t info;
 
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 
 	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=
 			NOTIFY_STOP) {
···
 	const struct bndcsr *bndcsr;
 	siginfo_t *info;
 
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	if (notify_die(DIE_TRAP, "bounds", regs, error_code,
 			X86_TRAP_BR, SIGSEGV) == NOTIFY_STOP)
 		return;
···
 {
 	struct task_struct *tsk;
 
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	conditional_sti(regs);
 
 	if (v8086_mode(regs)) {
···
 		return;
 
 	ist_enter(regs);
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
 	if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
 				SIGTRAP) == NOTIFY_STOP)
···
 
 dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
 {
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	math_error(regs, error_code, X86_TRAP_MF);
 }
 
 dotraplinkage void
 do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
 {
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	math_error(regs, error_code, X86_TRAP_XF);
 }
 
···
 dotraplinkage void
 do_device_not_available(struct pt_regs *regs, long error_code)
 {
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	BUG_ON(use_eager_fpu());
 
 #ifdef CONFIG_MATH_EMULATION
···
 {
 	siginfo_t info;
 
-	CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+	rcu_lockdep_assert(rcu_is_watching(), "entry code didn't wake RCU");
 	local_irq_enable();
 
 	info.si_signo = SIGILL;