linux-kernel - [ 27/64] MIPS: Unbreak function tracer for 64-bit kernel.

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Date:	Wed, 10 Apr 2013 15:46:24 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, David Daney <david.daney@...ium.com>,
	Al Cooper <alcooperx@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	viric@...ic.name
Subject: [ 27/64] MIPS: Unbreak function tracer for 64-bit kernel.

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Daney <david.daney@...ium.com>

commit ad8c396936e328f5344e1881afde9e28d5f2045f upstream.

Commit 58b69401c797 [MIPS: Function tracer: Fix broken function tracing]
completely broke the function tracer for 64-bit kernels.  The symptom is
a system hang very early in the boot process.

The fix: Remove/fix $sp adjustments for 64-bit case.

Signed-off-by: David Daney <david.daney@...ium.com>
Cc: linux-mips@...ux-mips.org
Cc: Al Cooper <alcooperx@...il.com>
Cc: viric@...ic.name
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/kernel/mcount.S |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -46,10 +46,9 @@
 	PTR_L	a5, PT_R9(sp)
 	PTR_L	a6, PT_R10(sp)
 	PTR_L	a7, PT_R11(sp)
-#else
-	PTR_ADDIU	sp, PT_SIZE
 #endif
-.endm
+	PTR_ADDIU	sp, PT_SIZE
+	.endm
 
 	.macro RETURN_BACK
 	jr ra
@@ -68,7 +67,11 @@ NESTED(ftrace_caller, PT_SIZE, ra)
 	.globl _mcount
 _mcount:
 	b	ftrace_stub
-	addiu sp,sp,8
+#ifdef CONFIG_32BIT
+	 addiu sp,sp,8
+#else
+	 nop
+#endif
 
 	/* When tracing is activated, it calls ftrace_caller+8 (aka here) */
 	lw	t1, function_trace_stop


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