Blackfin arch: add CONFIG_APP_STACKS_L1 to enable or disable putting kernel stacks in L1

use CONFIG_APP_STACKS_L1 to enable or disable putting kernel stacks in L1,
default is enabled, SMP kernel need turn it off

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index c507a92cb289..9d936a3986c8 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -629,6 +629,15 @@ config CPLB_SWITCH_TAB_L1
           If enabled, the CPLB Switch Tables are linked
           into L1 data memory. (less latency)
 
+config APP_STACK_L1
+        bool "Support locating application stack in L1 Scratch Memory"
+        default y
+        help
+          If enabled the application stack can be located in L1
+          scratch memory (less latency).
+
+          Currently only works with FLAT binaries.
+
 comment "Speed Optimizations"
 config BFIN_INS_LOWOVERHEAD
         bool "ins[bwl] low overhead, higher interrupt latency"