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authorMax Filippov <jcmvbkbc@gmail.com>2013-08-26 15:16:23 +0400
committerChris Zankel <chris@zankel.net>2013-09-06 09:46:49 -0700
commit16c5becf39a2d174f08b46504f522c2fa50ef462 (patch)
treed69f250d7f77b6d3bc0530186cf37f0ca28afb20
parentaea8e7c80ab50305257838bfb04f91a76cf9fec7 (diff)
downloadop-kernel-dev-16c5becf39a2d174f08b46504f522c2fa50ef462.zip
op-kernel-dev-16c5becf39a2d174f08b46504f522c2fa50ef462.tar.gz
xtensa: enable kernel preemption
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
-rw-r--r--arch/xtensa/kernel/entry.S45
1 files changed, 17 insertions, 28 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 03709ef..3f3de28 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -31,7 +31,6 @@
/* Unimplemented features. */
#undef KERNEL_STACK_OVERFLOW_CHECK
-#undef PREEMPTIBLE_KERNEL
#undef ALLOCA_EXCEPTION_IN_IRAM
/* Not well tested.
@@ -429,7 +428,9 @@ common_exception_return:
/* Jump if we are returning from kernel exceptions. */
l32i a3, a1, PT_PS
- _bbci.l a3, PS_UM_BIT, 4f
+ GET_THREAD_INFO(a2, a1)
+ l32i a4, a2, TI_FLAGS
+ _bbci.l a3, PS_UM_BIT, 6f
/* Specific to a user exception exit:
* We need to check some flags for signal handling and rescheduling,
@@ -438,9 +439,6 @@ common_exception_return:
* Note that we don't disable interrupts here.
*/
- GET_THREAD_INFO(a2,a1)
- l32i a4, a2, TI_FLAGS
-
_bbsi.l a4, TIF_NEED_RESCHED, 3f
_bbsi.l a4, TIF_NOTIFY_RESUME, 2f
_bbci.l a4, TIF_SIGPENDING, 5f
@@ -463,6 +461,19 @@ common_exception_return:
callx4 a4
j 1b
+#ifdef CONFIG_PREEMPT
+6:
+ _bbci.l a4, TIF_NEED_RESCHED, 4f
+
+ /* Check current_thread_info->preempt_count */
+
+ l32i a4, a2, TI_PRE_COUNT
+ bnez a4, 4f
+ movi a4, preempt_schedule_irq
+ callx4 a4
+ j 1b
+#endif
+
5:
#ifdef CONFIG_DEBUG_TLB_SANITY
l32i a4, a1, PT_DEPC
@@ -470,6 +481,7 @@ common_exception_return:
movi a4, check_tlb_sanity
callx4 a4
#endif
+6:
4:
#ifdef CONFIG_TRACE_IRQFLAGS
l32i a4, a1, PT_DEPC
@@ -573,29 +585,6 @@ user_exception_exit:
kernel_exception_exit:
-#ifdef PREEMPTIBLE_KERNEL
-
-#ifdef CONFIG_PREEMPT
-
- /*
- * Note: We've just returned from a call4, so we have
- * at least 4 addt'l regs.
- */
-
- /* Check current_thread_info->preempt_count */
-
- GET_THREAD_INFO(a2)
- l32i a3, a2, TI_PREEMPT
- bnez a3, 1f
-
- l32i a2, a2, TI_FLAGS
-
-1:
-
-#endif
-
-#endif
-
/* Check if we have to do a movsp.
*
* We only have to do a movsp if the previous window-frame has
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