ARM: 8035/1: Disable preemption in crunch_task_enable()
This patch is in preparation for calling the crunch_task_enable()
function with interrupts enabled.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-ep93xx/crunch-bits.S b/arch/arm/mach-ep93xx/crunch-bits.S
index 0ec9bb4..eaa5e34 100644
--- a/arch/arm/mach-ep93xx/crunch-bits.S
+++ b/arch/arm/mach-ep93xx/crunch-bits.S
@@ -16,6 +16,7 @@
#include <asm/ptrace.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
+#include <asm/assembler.h>
#include <mach/ep93xx-regs.h>
/*
@@ -65,11 +66,13 @@
* called from prefetch exception handler with interrupts disabled
*/
ENTRY(crunch_task_enable)
+ inc_preempt_count r10, r3
+
ldr r8, =(EP93XX_APB_VIRT_BASE + 0x00130000) @ syscon addr
ldr r1, [r8, #0x80]
tst r1, #0x00800000 @ access to crunch enabled?
- movne pc, lr @ if so no business here
+ bne 2f @ if so no business here
mov r3, #0xaa @ unlock syscon swlock
str r3, [r8, #0xc0]
orr r1, r1, #0x00800000 @ enable access to crunch
@@ -142,7 +145,7 @@
teq r0, #0 @ anything to load?
cfldr64eq mvdx0, [r1, #CRUNCH_MVDX0] @ mvdx0 was clobbered
- moveq pc, lr
+ beq 1f
crunch_load:
cfldr64 mvdx0, [r0, #CRUNCH_DSPSC] @ load status word
@@ -190,6 +193,11 @@
cfldr64 mvdx14, [r0, #CRUNCH_MVDX14]
cfldr64 mvdx15, [r0, #CRUNCH_MVDX15]
+1:
+#ifdef CONFIG_PREEMPT_COUNT
+ get_thread_info r10
+#endif
+2: dec_preempt_count r10, r3
mov pc, lr
/*