linux-kernel - [PATCH 1/5] CRISv32: add support for irqflags tracing

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Date:	Thu, 14 May 2015 18:43:11 +0200
From:	Rabin Vincent <rabin@....in>
To:	jesper.nilsson@...s.com
Cc:	linux-kernel@...r.kernel.org, linux-cris-kernel@...s.com,
	Rabin Vincent <rabin@....in>
Subject: [PATCH 1/5] CRISv32: add support for irqflags tracing

Add support irqflags tracing, which is required for things like lockdep
and ftrace.

Signed-off-by: Rabin Vincent <rabin@....in>
---
 arch/cris/Kconfig                 |  4 ++++
 arch/cris/arch-v32/kernel/entry.S | 11 +++++++++++
 arch/cris/kernel/irq.c            |  6 +++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 0314e32..efe829e 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -36,6 +36,10 @@ config FORCE_MAX_ZONEORDER
 	int
 	default 6
 
+config TRACE_IRQFLAGS_SUPPORT
+	depends on ETRAX_ARCH_V32
+	def_bool y
+
 config CRIS
 	bool
 	default y
diff --git a/arch/cris/arch-v32/kernel/entry.S b/arch/cris/arch-v32/kernel/entry.S
index 026a0b2..3591c37 100644
--- a/arch/cris/arch-v32/kernel/entry.S
+++ b/arch/cris/arch-v32/kernel/entry.S
@@ -240,6 +240,17 @@ ret_from_sys_call:
 
 	.type	_Rexit,@function
 _Rexit:
+#if defined(CONFIG_TRACE_IRQFLAGS)
+	addoq	+PT_ccs, $sp, $acr
+	move.d	[$acr], $r0
+	btstq	15, $r0		; I1
+	bpl	1f
+	nop
+	jsr	trace_hardirqs_on
+	nop
+1:
+#endif
+
 	;; This epilogue MUST match the prologues in multiple_interrupt, irq.h
 	;; and ptregs.h.
 	addq	4, $sp		; Skip orig_r10.
diff --git a/arch/cris/kernel/irq.c b/arch/cris/kernel/irq.c
index dd0be5d..694850e 100644
--- a/arch/cris/kernel/irq.c
+++ b/arch/cris/kernel/irq.c
@@ -45,7 +45,11 @@
 asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
 {
 	unsigned long sp;
-	struct pt_regs *old_regs = set_irq_regs(regs);
+	struct pt_regs *old_regs;
+
+	trace_hardirqs_off();
+
+	old_regs = set_irq_regs(regs);
 	irq_enter();
 	sp = rdsp();
 	if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
-- 
2.1.4

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