From: Max Filippov <jcmvbkbc@gmail.com>
To: Chris Zankel <chris@zankel.net>
Cc: Marc Gauthier <marc@tensilica.com>,
linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org,
Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH v2 06/11] xtensa: enable kernel preemption
Date: Fri, 30 Aug 2013 19:34:58 +0400 [thread overview]
Message-ID: <1377876903-27860-7-git-send-email-jcmvbkbc@gmail.com> (raw)
In-Reply-To: <1377876903-27860-1-git-send-email-jcmvbkbc@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
arch/xtensa/kernel/entry.S | 45 ++++++++++++++++---------------------------
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
--
1.7.7.6
next prev parent reply other threads:[~2013-08-30 15:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-30 15:34 [PATCH v2 00/11] xtensa queue 2013/08/30 Max Filippov
2013-08-30 15:34 ` [PATCH v2 01/11] xtensa: kernel: add "asm/ftrace.h" for pass compiling Max Filippov
2013-08-30 15:34 ` [PATCH v2 02/11] xtensa: fix arch spinlock function names Max Filippov
2013-08-30 15:34 ` [PATCH v2 03/11] xtensa: fix __delay for small loop count Max Filippov
2013-08-30 15:34 ` [PATCH v2 04/11] xtensa: fix build warning Max Filippov
2013-08-30 15:34 ` [PATCH v2 05/11] xtensa: check thread flags atomically on return from user exception Max Filippov
2013-08-30 15:34 ` Max Filippov [this message]
2013-08-30 15:34 ` [PATCH v2 07/11] xtensa: keep a3 and excsave1 on entry to exception handlers Max Filippov
2013-08-30 15:35 ` [PATCH v2 08/11] xtensa: new fast_alloca handler Max Filippov
2013-08-30 15:35 ` [PATCH v2 09/11] xtensa: don't use echo -e needlessly Max Filippov
2013-08-30 15:35 ` [PATCH v2 10/11] xtensa: fix !CONFIG_XTENSA_CALIBRATE_CCOUNT build failure Max Filippov
2013-08-30 15:35 ` [PATCH v2 11/11] xtensa: remove CCOUNT_PER_JIFFY Max Filippov
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