Blackfin arch: force irq_flags into the .data section

force irq_flags into the .data section by initializing it to
the hardware masks that cannot be disabled.  this way if we
use irq enable/disable functions before the .bss has been
zeroed out (as does our l1 relocate/dma functions), we dont
hit a problem where bss contains bogus crap.

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

2 files changed, 14 insertions, 2 deletions

diff --git a/arch/blackfin/mach-common/ints-priority-dc.c b/arch/blackfin/mach-common/ints-priority-dc.c
index 2db3546fc874..c2f05fabedc1 100644
--- a/arch/blackfin/mach-common/ints-priority-dc.c
+++ b/arch/blackfin/mach-common/ints-priority-dc.c
@@ -52,7 +52,13 @@
  * -
  */
 
-unsigned long irq_flags = 0;
+/* Initialize this to an actual value to force it into the .data
+ * section so that we know it is properly initialized at entry into
+ * the kernel but before bss is initialized to zero (which is where
+ * it would live otherwise).  The 0x1f magic represents the IRQs we
+ * cannot actually mask out in hardware.
+ */
+unsigned long irq_flags = 0x1f;
 
 /* The number of spurious interrupts */
 atomic_t num_spurious;
diff --git a/arch/blackfin/mach-common/ints-priority-sc.c b/arch/blackfin/mach-common/ints-priority-sc.c
index e06fe96b6fc3..7da5a0a134cc 100644
--- a/arch/blackfin/mach-common/ints-priority-sc.c
+++ b/arch/blackfin/mach-common/ints-priority-sc.c
@@ -58,7 +58,13 @@
  * -
  */
 
-unsigned long irq_flags = 0;
+/* Initialize this to an actual value to force it into the .data
+ * section so that we know it is properly initialized at entry into
+ * the kernel but before bss is initialized to zero (which is where
+ * it would live otherwise).  The 0x1f magic represents the IRQs we
+ * cannot actually mask out in hardware.
+ */
+unsigned long irq_flags = 0x1f;
 
 /* The number of spurious interrupts */
 atomic_t num_spurious;