[PATCH 4/5] arm: Disable preemption in crunch_task_enable()
From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2014-03-13 18:15:51
Subsystem:
arm port, arm/cirrus logic ep93xx arm architecture, the rest · Maintainers:
Russell King, Hartley Sweeten, Alexander Sverdlin, Nikita Shubin, Linus Torvalds
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 <redacted> --- arch/arm/mach-ep93xx/crunch-bits.S | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-ep93xx/crunch-bits.S b/arch/arm/mach-ep93xx/crunch-bits.S
index 0ec9bb48fab9..890c5df2b4fe 100644
--- a/arch/arm/mach-ep93xx/crunch-bits.S
+++ b/arch/arm/mach-ep93xx/crunch-bits.S@@ -65,11 +65,13 @@ * 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 +144,7 @@ crunch_save: 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 +192,11 @@ crunch_load: 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 /*