From: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Date: Wed, 10 Dec 2008 12:43:29 +0000 (+0000)
Subject: MN10300: Fix the preemption resume_kernel() routine
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=24646bd2269fbca95367bfd3eafbc9f7ade2e980;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

MN10300: Fix the preemption resume_kernel() routine

Fix the preemption resume_kernel() routine by inverting the test to see
whether interrupts are off (IM7 is all enabled, not all disabled).

Furthermore, interrupts should be disabled on entry to resume_kernel() so that
they're correctly set for jumping to restore_all() and doing the need
reschedule test.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index b7cbb1487af..62fba8aa9b6 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -180,6 +180,7 @@ ENTRY(resume_userspace)
 
 #ifdef CONFIG_PREEMPT
 ENTRY(resume_kernel)
+	__cli
 	mov	(TI_preempt_count,a2),d0	# non-zero preempt_count ?
 	cmp	0,d0
 	bne	restore_all
@@ -190,7 +191,7 @@ need_resched:
 	mov	(REG_EPSW,fp),d0
 	and	EPSW_IM,d0
 	cmp	EPSW_IM_7,d0		# interrupts off (exception path) ?
-	beq	restore_all
+	bne	restore_all
 	call	preempt_schedule_irq[],0
 	jmp	need_resched
 #endif