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MIPS: Unbreak function tracer for 64-bit kernel.

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Commit 58b69401c7 [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@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: Al Cooper <alcooperx@gmail.com>
Cc: viric@viric.name
Cc: stable@vger.kernel.org # 3.8.x
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2013-04-02 22:59:29 +00:00 committed by Ralf Baechle
parent 07961ac7c0
commit ad8c396936
1 changed files with 7 additions and 4 deletions
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11
arch/mips/kernel/mcount.S
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@ -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