powerpc/64/interrupt: Fix false warning in context tracking due to idle state

Commit 171476775d32 ("context_tracking: Convert state to atomic_t")
added a CONTEXT_IDLE state which can be encountered by interrupts from
kernel mode in the idle thread, causing a false positive warning.

Fixes: 171476775d32 ("context_tracking: Convert state to atomic_t")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926054305.2671436-2-npiggin@gmail.com

diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index 0d3405b..7303178 100644 (file)
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -195,7 +195,8 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs)
                 * so avoid recursion.
                 */
                if (TRAP(regs) != INTERRUPT_PROGRAM) {
-                       CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
+                       CT_WARN_ON(ct_state() != CONTEXT_KERNEL &&
+                                  ct_state() != CONTEXT_IDLE);
                        if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
                                BUG_ON(is_implicit_soft_masked(regs));
                }