[v6][PATCH 5/5] powerpc/book3e/kgdb: Fix a single stgep case of lazy IRQ

[Tiejun Chen]

In lazy EE magic, we may have a lazy interrupt occured while
entering kgdb, but we really don't want to replay that interrupt
for kgdb, so we have to clear the PACA_IRQ_HARD_DIS force to
make sure we can exit directly from this debug exception.

Signed-off-by: Tiejun Chen <tiejun.chen at windriver.com>
---
 arch/powerpc/kernel/kgdb.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 447c14b..9872f58 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -185,6 +185,14 @@ static int kgdb_singlestep(struct pt_regs *regs)
 		/* Restore current_thread_info lastly. */
 		memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info);
 
+#ifdef CONFIG_PPC64
+	/*
+	 * Clear the PACA_IRQ_HARD_DIS from the pending mask
+	 * since we are about to exit this directly from debug
+	 * exception without any replay interrupt in lazy EE case.
+	 */
+	local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
+#endif
 	return 1;
 }
 
-- 
1.7.9.5